src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/CustomFunctions.groovy

@@ -30,14 +30,14 @@ final class CustomFunctions {
 
     static void jsonArrayEmpty(ThrowawayDatabase db) {
         assertEquals(0L, db.conn.countAll(TEST_TABLE), 'The test table should be empty')
-        assertEquals('[]', db.conn.customJsonArray(FindQuery.all(TEST_TABLE), List.of(), Results::jsonFromData),
+        assertEquals('[]', db.conn.customJsonArray(FindQuery.all(TEST_TABLE), List.of(), Results.&jsonFromData),
                 'An empty list was not represented correctly');
     }
 
     static void jsonArraySingle(ThrowawayDatabase db) {
         db.conn.insert(TEST_TABLE, new ArrayDocument("one", List.of("2", "3")))
         assertEquals(JsonFunctions.maybeJsonB('[{"id":"one","values":["2","3"]}]'),
-                db.conn.customJsonArray(FindQuery.all(TEST_TABLE), List.of(), Results::jsonFromData),
+                db.conn.customJsonArray(FindQuery.all(TEST_TABLE), List.of(), Results.&jsonFromData),
                 'A single document list was not represented correctly')
     }
 
@@ -46,10 +46,38 @@ final class CustomFunctions {
         assertEquals(JsonFunctions.maybeJsonB('[{"id":"first","values":["a","b","c"]},'
                         + '{"id":"second","values":["c","d","e"]},{"id":"third","values":["x","y","z"]}]'),
                 db.conn.customJsonArray(FindQuery.all(TEST_TABLE) + QueryUtils.orderBy(List.of(Field.named("id"))),
-                        List.of(), Results::jsonFromData),
+                        List.of(), Results.&jsonFromData),
                 'A multiple document list was not represented correctly')
     }
 
+    static void writeJsonArrayEmpty(ThrowawayDatabase db) {
+        assertEquals(0L, db.conn.countAll(TEST_TABLE), 'The test table should be empty')
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeCustomJsonArray(FindQuery.all(TEST_TABLE), List.of(), writer, Results.&jsonFromData)
+        assertEquals("[]", output.toString(), 'An empty list was not represented correctly')
+    }
+
+    static void writeJsonArraySingle(ThrowawayDatabase db) {
+        db.conn.insert(TEST_TABLE, new ArrayDocument("one", List.of("2", "3")))
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeCustomJsonArray(FindQuery.all(TEST_TABLE), List.of(), writer, Results.&jsonFromData)
+        assertEquals(JsonFunctions.maybeJsonB('[{"id":"one","values":["2","3"]}]'), output.toString(),
+                'A single document list was not represented correctly')
+    }
+
+    static void writeJsonArrayMany(ThrowawayDatabase db) {
+        ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeCustomJsonArray(FindQuery.all(TEST_TABLE) + QueryUtils.orderBy(List.of(Field.named("id"))),
+                List.of(), writer, Results.&jsonFromData)
+        assertEquals(JsonFunctions.maybeJsonB('[{"id":"first","values":["a","b","c"]},'
+                        + '{"id":"second","values":["c","d","e"]},{"id":"third","values":["x","y","z"]}]'),
+                output.toString(), "A multiple document list was not represented correctly")
+    }
+
     static void singleNone(ThrowawayDatabase db) {
         assertFalse(db.conn.customSingle(FindQuery.all(TEST_TABLE), List.of(), JsonDocument, Results.&fromData)
                         .isPresent(),
@@ -65,14 +93,14 @@ final class CustomFunctions {
     }
 
     static void jsonSingleNone(ThrowawayDatabase db) {
-        assertEquals('{}', db.conn.customJsonSingle(FindQuery.all(TEST_TABLE), List.of(), Results::jsonFromData),
+        assertEquals('{}', db.conn.customJsonSingle(FindQuery.all(TEST_TABLE), List.of(), Results.&jsonFromData),
                 'An empty document was not represented correctly')
     }
 
     static void jsonSingleOne(ThrowawayDatabase db) {
         db.conn.insert(TEST_TABLE, new ArrayDocument("me", List.of("myself", "i")))
         assertEquals(JsonFunctions.maybeJsonB('{"id":"me","values":["myself","i"]}'),
-                db.conn.customJsonSingle(FindQuery.all(TEST_TABLE), List.of(), Results::jsonFromData),
+                db.conn.customJsonSingle(FindQuery.all(TEST_TABLE), List.of(), Results.&jsonFromData),
                 'A single document was not represented correctly');
     }
 

src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/JsonFunctions.groovy

@@ -43,9 +43,7 @@ final class JsonFunctions {
         return maybeJsonB("{\"id\":\"$id\"")
     }
 
-    static void allDefault(ThrowawayDatabase db) {
-        JsonDocument.load(db)
-        String json = db.conn.jsonAll(TEST_TABLE)
+    private static void checkAllDefault(String json) {
         assertTrue(json.startsWith('['), "JSON should start with '[' ($json)")
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
@@ -66,13 +64,35 @@ final class JsonFunctions {
         assertTrue(json.endsWith(']'), "JSON should end with ']' ($json)")
     }
 
-    static void allEmpty(ThrowawayDatabase db) {
-        assertEquals('[]', db.conn.jsonAll(TEST_TABLE), 'There should have been no documents returned')
+    static void allDefault(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkAllDefault(db.conn.jsonAll(TEST_TABLE))
     }
 
-    static void byIdString(ThrowawayDatabase db) {
+    static void writeAllDefault(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonById(TEST_TABLE, 'two')
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonAll(TEST_TABLE, writer)
+        checkAllDefault(output.toString())
+    }
+
+    private static void checkAllEmpty(String json) {
+        assertEquals('[]', json, 'There should have been no documents returned')
+    }
+
+    static void allEmpty(ThrowawayDatabase db) {
+        checkAllEmpty(db.conn.jsonAll(TEST_TABLE))
+    }
+
+    static void writeAllEmpty(ThrowawayDatabase db) {
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonAll(TEST_TABLE, writer)
+        checkAllEmpty(output.toString())
+    }
+
+    private static void checkByIdString(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.two, json, 'An incorrect document was returned')
@@ -83,26 +103,64 @@ final class JsonFunctions {
         }
     }
 
+    static void byIdString(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkByIdString(db.conn.jsonById(TEST_TABLE, 'two'))
+    }
+
+    static void writeByIdString(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonById(TEST_TABLE, writer, 'two')
+        checkByIdString(output.toString())
+    }
+
+    private static void checkByIdNumber(String json) {
+        assertEquals(maybeJsonB('{"key":18,"text":"howdy"}'), json, 'The document should have been found by numeric ID')
+    }
+
     static void byIdNumber(ThrowawayDatabase db) {
         Configuration.idField = 'key'
         try {
             db.conn.insert(TEST_TABLE, new NumIdDocument(18, 'howdy'))
-            assertEquals(maybeJsonB('{"key":18,"text":"howdy"}'), db.conn.jsonById(TEST_TABLE, 18),
-                    'The document should have been found by numeric ID')
+            checkByIdNumber(db.conn.jsonById(TEST_TABLE, 18))
         } finally {
             Configuration.idField = 'id'
         }
     }
 
-    static void byIdNotFound(ThrowawayDatabase db) {
-        JsonDocument.load(db)
-        assertEquals('{}', db.conn.jsonById(TEST_TABLE, 'x'), 'There should have been no document returned')
+    static void writeByIdNumber(ThrowawayDatabase db) {
+        Configuration.idField = 'key'
+        try {
+            db.conn.insert(TEST_TABLE, new NumIdDocument(18, 'howdy'))
+            def output = new StringWriter()
+            def writer = new PrintWriter(output)
+            db.conn.writeJsonById(TEST_TABLE, writer, 18)
+            checkByIdNumber(output.toString())
+        } finally {
+            Configuration.idField = 'id'
+        }
     }
 
-    static void byFieldsMatch(ThrowawayDatabase db) {
+    private static void checkByIdNotFound(String json) {
+        assertEquals('{}', json, 'There should have been no document returned')
+    }
+
+    static void byIdNotFound(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByFields(TEST_TABLE, List.of(Field.any('value', List.of('blue', 'purple')),
-                Field.exists('sub')), FieldMatch.ALL)
+        checkByIdNotFound(db.conn.jsonById(TEST_TABLE, 'x'))
+    }
+
+    static void writeByIdNotFound(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonById(TEST_TABLE, writer, 'x')
+        checkByIdNotFound(output.toString())
+    }
+
+    private static void checkByFieldsMatch(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals("[${JsonDocument.four}]".toString(), json, 'The incorrect document was returned')
@@ -115,10 +173,22 @@ final class JsonFunctions {
         }
     }
 
-    static void byFieldsMatchOrdered(ThrowawayDatabase db) {
+    static void byFieldsMatch(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByFields(TEST_TABLE, List.of(Field.equal('value', 'purple')), null,
-                List.of(Field.named('id')))
+        checkByFieldsMatch(db.conn.jsonByFields(TEST_TABLE, List.of(Field.any('value', List.of('blue', 'purple')),
+                Field.exists('sub')), FieldMatch.ALL))
+    }
+
+    static void writeByFieldsMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.any('value', List.of('blue', 'purple')),
+                Field.exists('sub')), FieldMatch.ALL)
+        checkByFieldsMatch(output.toString())
+    }
+
+    private static checkByFieldsMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals("[${JsonDocument.five},${JsonDocument.four}]".toString(), json,
@@ -136,9 +206,22 @@ final class JsonFunctions {
         }
     }
 
-    static void byFieldsMatchNumIn(ThrowawayDatabase db) {
+    static void byFieldsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByFields(TEST_TABLE, List.of(Field.any('numValue', List.of(2, 4, 6, 8))))
+        checkByFieldsMatchOrdered(db.conn.jsonByFields(TEST_TABLE, List.of(Field.equal('value', 'purple')), null,
+                List.of(Field.named('id'))))
+    }
+
+    static void writeByFieldsMatchOrdered(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.equal('value', 'purple')), null,
+                List.of(Field.named('id')))
+        checkByFieldsMatchOrdered(output.toString())
+    }
+
+    private static void checkByFieldsMatchNumIn(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals("[${JsonDocument.three}]".toString(), json, 'The incorrect document was returned')
@@ -151,30 +234,76 @@ final class JsonFunctions {
         }
     }
 
-    static void byFieldsNoMatch(ThrowawayDatabase db) {
+    static void byFieldsMatchNumIn(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('[]', db.conn.jsonByFields(TEST_TABLE, List.of(Field.greater('numValue', 100))),
-                'There should have been no documents returned')
+        checkByFieldsMatchNumIn(db.conn.jsonByFields(TEST_TABLE, List.of(Field.any('numValue', List.of(2, 4, 6, 8)))))
     }
 
-    static void byFieldsMatchInArray(ThrowawayDatabase db) {
-        ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
-        String json = db.conn.jsonByFields(TEST_TABLE, List.of(Field.inArray('values', TEST_TABLE, List.of('c'))))
+    static void writeByFieldsMatchNumIn(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.any('numValue', List.of(2, 4, 6, 8))))
+        checkByFieldsMatchNumIn(output.toString())
+    }
+
+    private static void checkByFieldsNoMatch(String json) {
+        assertEquals('[]', json, 'There should have been no documents returned')
+    }
+
+    static void byFieldsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkByFieldsNoMatch(db.conn.jsonByFields(TEST_TABLE, List.of(Field.greater('numValue', 100))))
+    }
+
+    static void writeByFieldsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.greater('numValue', 100)))
+        checkByFieldsNoMatch(output.toString())
+    }
+
+    private static void checkByFieldsMatchInArray(String json) {
         assertTrue(json.startsWith('['), "JSON should start with '[' ($json)")
         assertTrue(json.contains(docId('first')), "The 'first' document was not found ($json)")
         assertTrue(json.contains(docId('second')), "The 'second' document was not found ($json)")
         assertTrue(json.endsWith(']'), "JSON should end with ']' ($json)")
     }
 
-    static void byFieldsNoMatchInArray(ThrowawayDatabase db) {
+    static void byFieldsMatchInArray(ThrowawayDatabase db) {
         ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
-        assertEquals('[]', db.conn.jsonByFields(TEST_TABLE, List.of(Field.inArray('values', TEST_TABLE, List.of('j')))),
-                'There should have been no documents returned')
+        checkByFieldsMatchInArray(db.conn.jsonByFields(TEST_TABLE,
+                List.of(Field.inArray('values', TEST_TABLE, List.of('c')))))
     }
 
-    static void byContainsMatch(ThrowawayDatabase db) {
-        JsonDocument.load(db)
-        String json = db.conn.jsonByContains(TEST_TABLE, Map.of('value', 'purple'))
+    static void writeByFieldsMatchInArray(ThrowawayDatabase db) {
+        ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.inArray('values', TEST_TABLE, List.of('c'))))
+        checkByFieldsMatchInArray(output.toString())
+    }
+
+    private static void checkByFieldsNoMatchInArray(String json) {
+        assertEquals('[]', json, 'There should have been no documents returned')
+    }
+
+    static void byFieldsNoMatchInArray(ThrowawayDatabase db) {
+        ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
+        checkByFieldsNoMatchInArray(db.conn.jsonByFields(TEST_TABLE,
+                List.of(Field.inArray('values', TEST_TABLE, List.of('j')))))
+    }
+
+    static void writeByFieldsNoMatchInArray(ThrowawayDatabase db) {
+        ArrayDocument.testDocuments.forEach { db.conn.insert(TEST_TABLE, it) }
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByFields(TEST_TABLE, writer, List.of(Field.inArray('values', TEST_TABLE, List.of('j'))))
+        checkByFieldsNoMatchInArray(output.toString())
+    }
+
+    private static void checkByContainsMatch(String json) {
         assertTrue(json.startsWith('['), "JSON should start with '[' ($json)")
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
@@ -189,10 +318,20 @@ final class JsonFunctions {
         assertTrue(json.endsWith(']'), "JSON should end with ']' ($json)")
     }
 
-    static void byContainsMatchOrdered(ThrowawayDatabase db) {
+    static void byContainsMatch(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByContains(TEST_TABLE, Map.of('sub', Map.of('foo', 'green')),
-                List.of(Field.named('value')))
+        checkByContainsMatch(db.conn.jsonByContains(TEST_TABLE, Map.of('value', 'purple')))
+    }
+
+    static void writeByContainsMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByContains(TEST_TABLE, writer, Map.of('value', 'purple'))
+        checkByContainsMatch(output.toString())
+    }
+
+    private static void checkByContainsMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals("[${JsonDocument.two},${JsonDocument.four}]", json,
@@ -210,15 +349,39 @@ final class JsonFunctions {
         }
     }
 
-    static void byContainsNoMatch(ThrowawayDatabase db) {
+    static void byContainsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('[]', db.conn.jsonByContains(TEST_TABLE, Map.of('value', 'indigo')),
-                'There should have been no documents returned')
+        checkByContainsMatchOrdered(db.conn.jsonByContains(TEST_TABLE, Map.of('sub', Map.of('foo', 'green')),
+                List.of(Field.named('value'))))
     }
 
-    static void byJsonPathMatch(ThrowawayDatabase db) {
+    static void writeByContainsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)')
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByContains(TEST_TABLE, writer, Map.of('sub', Map.of('foo', 'green')),
+                List.of(Field.named('value')))
+        checkByContainsMatchOrdered(output.toString())
+    }
+
+    private static void checkByContainsNoMatch(String json) {
+        assertEquals('[]', json, 'There should have been no documents returned')
+    }
+
+    static void byContainsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkByContainsNoMatch(db.conn.jsonByContains(TEST_TABLE, Map.of('value', 'indigo')))
+    }
+
+    static void writeByContainsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByContains(TEST_TABLE, writer, Map.of('value', 'indigo'))
+        checkByContainsNoMatch(output.toString())
+    }
+
+    private static void checkByJsonPathMatch(String json) {
         assertTrue(json.startsWith('['), "JSON should start with '[' ($json)")
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
@@ -233,9 +396,20 @@ final class JsonFunctions {
         assertTrue(json.endsWith(']'), "JSON should end with ']' ($json)")
     }
 
-    static void byJsonPathMatchOrdered(ThrowawayDatabase db) {
+    static void byJsonPathMatch(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)', List.of(Field.named('id')))
+        checkByJsonPathMatch(db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)'))
+    }
+
+    static void writeByJsonPathMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 10)')
+        checkByJsonPathMatch(output.toString())
+    }
+
+    private static void checkByJsonPathMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals("[${JsonDocument.five},${JsonDocument.four}]", json,
@@ -253,15 +427,38 @@ final class JsonFunctions {
         }
     }
 
-    static void byJsonPathNoMatch(ThrowawayDatabase db) {
+    static void byJsonPathMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('[]', db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 100)'),
-                'There should have been no documents returned')
+        checkByJsonPathMatchOrdered(db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)',
+                List.of(Field.named('id'))))
     }
 
-    static void firstByFieldsMatchOne(ThrowawayDatabase db) {
+    static void writeByJsonPathMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('value', 'another')))
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 10)', List.of(Field.named('id')))
+        checkByJsonPathMatchOrdered(output.toString())
+    }
+
+    private static void checkByJsonPathNoMatch(String json) {
+        assertEquals('[]', json, 'There should have been no documents returned')
+    }
+
+    static void byJsonPathNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkByJsonPathNoMatch(db.conn.jsonByJsonPath(TEST_TABLE, '$.numValue ? (@ > 100)'))
+    }
+
+    static void writeByJsonPathNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 100)')
+        checkByJsonPathNoMatch(output.toString())
+    }
+
+    private static void checkFirstByFieldsMatchOne(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.two, json, 'The incorrect document was returned')
@@ -272,13 +469,24 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByFieldsMatchMany(ThrowawayDatabase db) {
+    static void firstByFieldsMatchOne(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('sub.foo', 'green')))
+        checkFirstByFieldsMatchOne(db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('value', 'another'))))
+    }
+
+    static void writeFirstByFieldsMatchOne(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByFields(TEST_TABLE, writer, List.of(Field.equal('value', 'another')))
+        checkFirstByFieldsMatchOne(output.toString())
+    }
+
+    private static void checkFirstByFieldsMatchMany(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertTrue(json.contains(JsonDocument.two) || json.contains(JsonDocument.four),
-                    "Expected document 'two' or 'four' ($json)")
+                        "Expected document 'two' or 'four' ($json)")
                 break
             case Dialect.POSTGRESQL:
                 assertTrue(json.contains(docId('two')) || json.contains(docId('four')),
@@ -287,10 +495,20 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByFieldsMatchOrdered(ThrowawayDatabase db) {
+    static void firstByFieldsMatchMany(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('sub.foo', 'green')), null,
-                List.of(Field.named('n:numValue DESC')))
+        checkFirstByFieldsMatchMany(db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('sub.foo', 'green'))))
+    }
+
+    static void writeFirstByFieldsMatchMany(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByFields(TEST_TABLE, writer, List.of(Field.equal('sub.foo', 'green')))
+        checkFirstByFieldsMatchMany(output.toString())
+    }
+
+    private static void checkFirstByFieldsMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.four, json, 'An incorrect document was returned')
@@ -301,15 +519,39 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByFieldsNoMatch(ThrowawayDatabase db) {
+    static void firstByFieldsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('{}', db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('value', 'absent'))),
-                'There should have been no document returned')
+        checkFirstByFieldsMatchOrdered(db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('sub.foo', 'green')),
+                null, List.of(Field.named('n:numValue DESC'))))
     }
 
-    static void firstByContainsMatchOne(ThrowawayDatabase db) {
+    static void writeFirstByFieldsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'FIRST!'))
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByFields(TEST_TABLE, writer, List.of(Field.equal('sub.foo', 'green')),
+                null, List.of(Field.named('n:numValue DESC')))
+        checkFirstByFieldsMatchOrdered(output.toString())
+    }
+
+    private static void checkFirstByFieldsNoMatch(String json) {
+        assertEquals('{}', json, 'There should have been no document returned')
+    }
+
+    static void firstByFieldsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkFirstByFieldsNoMatch(db.conn.jsonFirstByFields(TEST_TABLE, List.of(Field.equal('value', 'absent'))))
+    }
+
+    static void writeFirstByFieldsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByFields(TEST_TABLE, writer, List.of(Field.equal('value', 'absent')))
+        checkFirstByFieldsNoMatch(output.toString())
+    }
+
+    private static void checkFirstByContainsMatchOne(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.one, json, 'An incorrect document was returned')
@@ -320,25 +562,46 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByContainsMatchMany(ThrowawayDatabase db) {
+    static void firstByContainsMatchOne(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'purple'))
+        checkFirstByContainsMatchOne(db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'FIRST!')))
+    }
+
+    static void writeFirstByContainsMatchOne(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByContains(TEST_TABLE, writer, Map.of('value', 'FIRST!'))
+        checkFirstByContainsMatchOne(output.toString())
+    }
+
+    private static void checkFirstByContainsMatchMany(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertTrue(json.contains(JsonDocument.four) || json.contains(JsonDocument.five),
-                    "Expected document 'four' or 'five' ($json)")
+                        "Expected document 'four' or 'five' ($json)")
                 break
             case Dialect.POSTGRESQL:
                 assertTrue( json.contains(docId('four')) || json.contains(docId('five')),
-                    "Expected document 'four' or 'five' ($json)")
+                        "Expected document 'four' or 'five' ($json)")
                 break
         }
     }
 
-    static void firstByContainsMatchOrdered(ThrowawayDatabase db) {
+    static void firstByContainsMatchMany(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'purple'),
-                List.of(Field.named('sub.bar NULLS FIRST')))
+        checkFirstByContainsMatchMany(db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'purple')))
+    }
+
+    static void writeFirstByContainsMatchMany(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByContains(TEST_TABLE, writer, Map.of('value', 'purple'))
+        checkFirstByContainsMatchMany(output.toString())
+    }
+
+    private static void checkFirstByContainsMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.five, json, 'An incorrect document was returned')
@@ -349,15 +612,39 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByContainsNoMatch(ThrowawayDatabase db) {
+    static void firstByContainsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('{}', db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'indigo')),
-                'There should have been no document returned')
+        checkFirstByContainsMatchOrdered(db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'purple'),
+                List.of(Field.named('sub.bar NULLS FIRST'))))
     }
 
-    static void firstByJsonPathMatchOne(ThrowawayDatabase db) {
+    static void writeFirstByContainsMatchOrdered(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ == 10)')
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByContains(TEST_TABLE, writer, Map.of('value', 'purple'),
+                List.of(Field.named('sub.bar NULLS FIRST')))
+        checkFirstByContainsMatchOrdered(output.toString())
+    }
+
+    private static void checkFirstByContainsNoMatch(String json) {
+        assertEquals('{}', json, 'There should have been no document returned')
+    }
+
+    static void firstByContainsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkFirstByContainsNoMatch(db.conn.jsonFirstByContains(TEST_TABLE, Map.of('value', 'indigo')))
+    }
+
+    static void writeFirstByContainsNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByContains(TEST_TABLE, writer, Map.of('value', 'indigo'))
+        checkFirstByContainsNoMatch(output.toString())
+    }
+
+    private static void checkFirstByJsonPathMatchOne(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.two, json, 'An incorrect document was returned')
@@ -368,24 +655,46 @@ final class JsonFunctions {
         }
     }
 
-    static void firstByJsonPathMatchMany(ThrowawayDatabase db) {
+    static void firstByJsonPathMatchOne(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)')
+        checkFirstByJsonPathMatchOne(db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ == 10)'))
+    }
+
+    static void writeFirstByJsonPathMatchOne(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ == 10)')
+        checkFirstByJsonPathMatchOne(output.toString())
+    }
+
+    private static void checkFirstByJsonPathMatchMany(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertTrue(json.contains(JsonDocument.four) || json.contains(JsonDocument.five),
-                    "Expected document 'four' or 'five' ($json)")
+                        "Expected document 'four' or 'five' ($json)")
                 break
             case Dialect.POSTGRESQL:
                 assertTrue(json.contains(docId('four')) || json.contains(docId('five')),
-                    "Expected document 'four' or 'five' ($json)")
+                        "Expected document 'four' or 'five' ($json)")
                 break
         }
     }
 
-    static void firstByJsonPathMatchOrdered(ThrowawayDatabase db) {
+    static void firstByJsonPathMatchMany(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        String json = db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)', List.of(Field.named('id DESC')))
+        checkFirstByJsonPathMatchMany(db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)'))
+    }
+
+    static void writeFirstByJsonPathMatchMany(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 10)')
+        checkFirstByJsonPathMatchMany(output.toString())
+    }
+
+    private static void checkFirstByJsonPathMatchOrdered(String json) {
         switch (Configuration.dialect()) {
             case Dialect.SQLITE:
                 assertEquals(JsonDocument.four, json, 'An incorrect document was returned')
@@ -396,9 +705,34 @@ final class JsonFunctions {
         }
     }
 
+    static void firstByJsonPathMatchOrdered(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        checkFirstByJsonPathMatchOrdered(db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 10)',
+                List.of(Field.named('id DESC'))))
+    }
+
+    static void writeFirstByJsonPathMatchOrdered(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 10)', List.of(Field.named('id DESC')))
+        checkFirstByJsonPathMatchOrdered(output.toString())
+    }
+
+    private static void checkFirstByJsonPathNoMatch(String json) {
+        assertEquals('{}', json, 'There should have been no document returned')
+    }
+
     static void firstByJsonPathNoMatch(ThrowawayDatabase db) {
         JsonDocument.load(db)
-        assertEquals('{}', db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 100)'),
-                'There should have been no document returned')
+        checkFirstByJsonPathNoMatch(db.conn.jsonFirstByJsonPath(TEST_TABLE, '$.numValue ? (@ > 100)'))
+    }
+
+    static void writeFirstByJsonPathNoMatch(ThrowawayDatabase db) {
+        JsonDocument.load(db)
+        def output = new StringWriter()
+        def writer = new PrintWriter(output)
+        db.conn.writeJsonFirstByJsonPath(TEST_TABLE, writer, '$.numValue ? (@ > 100)')
+        checkFirstByJsonPathNoMatch(output.toString())
     }
 }

src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/PostgreSQLCustomIT.groovy

@@ -39,6 +39,24 @@ final class PostgreSQLCustomIT {
         new PgDB().withCloseable CustomFunctions.&jsonArrayMany
     }
 
+    @Test
+    @DisplayName('writeJsonArray succeeds with empty array')
+    void writeJsonArrayEmpty() {
+        new PgDB().withCloseable CustomFunctions.&writeJsonArrayEmpty
+    }
+
+    @Test
+    @DisplayName('writeJsonArray succeeds with a single-item array')
+    void writeJsonArraySingle() {
+        new PgDB().withCloseable CustomFunctions.&writeJsonArraySingle
+    }
+
+    @Test
+    @DisplayName('writeJsonArray succeeds with a multi-item array')
+    void writeJsonArrayMany() {
+        new PgDB().withCloseable CustomFunctions.&writeJsonArrayMany
+    }
+
     @Test
     @DisplayName('single succeeds when document not found')
     void singleNone() {

src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/PostgreSQLJsonIT.groovy

@@ -182,4 +182,178 @@ final class PostgreSQLJsonIT {
     void firstByJsonPathNoMatch() {
         new PgDB().withCloseable JsonFunctions.&firstByJsonPathNoMatch
     }
+
+    @Test
+    @DisplayName('writeAll retrieves all documents')
+    void writeAllDefault() {
+        new PgDB().withCloseable JsonFunctions.&writeAllDefault
+    }
+
+    @Test
+    @DisplayName('writeAll succeeds with an empty table')
+    void writeAllEmpty() {
+        new PgDB().withCloseable JsonFunctions.&writeAllEmpty
+    }
+
+    @Test
+    @DisplayName('writeById retrieves a document via a string ID')
+    void writeByIdString() {
+        new PgDB().withCloseable JsonFunctions.&writeByIdString
+    }
+
+    @Test
+    @DisplayName('writeById retrieves a document via a numeric ID')
+    void writeByIdNumber() {
+        new PgDB().withCloseable JsonFunctions.&writeByIdNumber
+    }
+
+    @Test
+    @DisplayName('writeById returns null when a matching ID is not found')
+    void writeByIdNotFound() {
+        new PgDB().withCloseable JsonFunctions.&writeByIdNotFound
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents')
+    void writeByFieldsMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsMatch
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves ordered matching documents')
+    void writeByFieldsMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents with a numeric IN clause')
+    void writeByFieldsMatchNumIn() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsMatchNumIn
+    }
+
+    @Test
+    @DisplayName('writeByFields succeeds when no documents match')
+    void writeByFieldsNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents with an IN_ARRAY comparison')
+    void writeByFieldsMatchInArray() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsMatchInArray
+    }
+
+    @Test
+    @DisplayName('writeByFields succeeds when no documents match an IN_ARRAY comparison')
+    void writeByFieldsNoMatchInArray() {
+        new PgDB().withCloseable JsonFunctions.&writeByFieldsNoMatchInArray
+    }
+
+    @Test
+    @DisplayName('writeByContains retrieves matching documents')
+    void writeByContainsMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByContainsMatch
+    }
+
+    @Test
+    @DisplayName('writeByContains retrieves ordered matching documents')
+    void writeByContainsMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeByContainsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeByContains succeeds when no documents match')
+    void writeByContainsNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByContainsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeByJsonPath retrieves matching documents')
+    void writeByJsonPathMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByJsonPathMatch
+    }
+
+    @Test
+    @DisplayName('writeByJsonPath retrieves ordered matching documents')
+    void writeByJsonPathMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeByJsonPathMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeByJsonPath succeeds when no documents match')
+    void writeByJsonPathNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeByJsonPathNoMatch
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document')
+    void writeFirstByFieldsMatchOne() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchOne
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document among many')
+    void writeFirstByFieldsMatchMany() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchMany
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document among many (ordered)')
+    void writeFirstByFieldsMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields returns null when no document matches')
+    void writeFirstByFieldsNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByFieldsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeFirstByContains retrieves a matching document')
+    void writeFirstByContainsMatchOne() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByContainsMatchOne
+    }
+
+    @Test
+    @DisplayName('writeFirstByContains retrieves a matching document among many')
+    void writeFirstByContainsMatchMany() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByContainsMatchMany
+    }
+
+    @Test
+    @DisplayName('writeFirstByContains retrieves a matching document among many (ordered)')
+    void writeFirstByContainsMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByContainsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeFirstByContains returns null when no document matches')
+    void writeFirstByContainsNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByContainsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeFirstByJsonPath retrieves a matching document')
+    void writeFirstByJsonPathMatchOne() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByJsonPathMatchOne
+    }
+
+    @Test
+    @DisplayName('writeFirstByJsonPath retrieves a matching document among many')
+    void writeFirstByJsonPathMatchMany() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByJsonPathMatchMany
+    }
+
+    @Test
+    @DisplayName('writeFirstByJsonPath retrieves a matching document among many (ordered)')
+    void writeFirstByJsonPathMatchOrdered() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByJsonPathMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeFirstByJsonPath returns null when no document matches')
+    void writeFirstByJsonPathNoMatch() {
+        new PgDB().withCloseable JsonFunctions.&writeFirstByJsonPathNoMatch
+    }
 }

src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/SQLiteCustomIT.groovy

@@ -21,6 +21,42 @@ final class SQLiteCustomIT {
         new SQLiteDB().withCloseable CustomFunctions.&listAll
     }
 
+    @Test
+    @DisplayName('jsonArray succeeds with empty array')
+    void jsonArrayEmpty() {
+        new SQLiteDB().withCloseable CustomFunctions.&jsonArrayEmpty
+    }
+
+    @Test
+    @DisplayName('jsonArray succeeds with a single-item array')
+    void jsonArraySingle() {
+        new SQLiteDB().withCloseable CustomFunctions.&jsonArraySingle
+    }
+
+    @Test
+    @DisplayName('jsonArray succeeds with a multi-item array')
+    void jsonArrayMany() {
+        new SQLiteDB().withCloseable CustomFunctions.&jsonArrayMany
+    }
+
+    @Test
+    @DisplayName('writeJsonArray succeeds with empty array')
+    void writeJsonArrayEmpty() {
+        new SQLiteDB().withCloseable CustomFunctions.&writeJsonArrayEmpty
+    }
+
+    @Test
+    @DisplayName('writeJsonArray succeeds with a single-item array')
+    void writeJsonArraySingle() {
+        new SQLiteDB().withCloseable CustomFunctions.&writeJsonArraySingle
+    }
+
+    @Test
+    @DisplayName('writeJsonArray succeeds with a multi-item array')
+    void writeJsonArrayMany() {
+        new SQLiteDB().withCloseable CustomFunctions.&writeJsonArrayMany
+    }
+
     @Test
     @DisplayName('single succeeds when document not found')
     void singleNone() {

src/groovy/src/test/groovy/solutions/bitbadger/documents/groovy/tests/integration/SQLiteJsonIT.groovy

@@ -133,4 +133,126 @@ final class SQLiteJsonIT {
             assertThrows(DocumentException) { JsonFunctions.firstByJsonPathMatchOne db }
         }
     }
+
+    @Test
+    @DisplayName('writeAll retrieves all documents')
+    void writeAllDefault() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeAllDefault
+    }
+
+    @Test
+    @DisplayName('writeAll succeeds with an empty table')
+    void writeAllEmpty() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeAllEmpty
+    }
+
+    @Test
+    @DisplayName('writeById retrieves a document via a string ID')
+    void writeByIdString() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByIdString
+    }
+
+    @Test
+    @DisplayName('writeById retrieves a document via a numeric ID')
+    void writeByIdNumber() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByIdNumber
+    }
+
+    @Test
+    @DisplayName('writeById returns null when a matching ID is not found')
+    void writeByIdNotFound() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByIdNotFound
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents')
+    void writeByFieldsMatch() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsMatch
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves ordered matching documents')
+    void writeByFieldsMatchOrdered() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents with a numeric IN clause')
+    void writeByFieldsMatchNumIn() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsMatchNumIn
+    }
+
+    @Test
+    @DisplayName('writeByFields succeeds when no documents match')
+    void writeByFieldsNoMatch() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeByFields retrieves matching documents with an IN_ARRAY comparison')
+    void writeByFieldsMatchInArray() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsMatchInArray
+    }
+
+    @Test
+    @DisplayName('writeByFields succeeds when no documents match an IN_ARRAY comparison')
+    void writeByFieldsNoMatchInArray() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeByFieldsNoMatchInArray
+    }
+
+    @Test
+    @DisplayName('writeByContains fails')
+    void writeByContainsFails() {
+        new SQLiteDB().withCloseable { db ->
+            assertThrows(DocumentException) { JsonFunctions.writeByContainsMatch db }
+        }
+    }
+
+    @Test
+    @DisplayName('writeByJsonPath fails')
+    void writeByJsonPathFails() {
+        new SQLiteDB().withCloseable { db ->
+            assertThrows(DocumentException) { JsonFunctions.writeByJsonPathMatch db }
+        }
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document')
+    void writeFirstByFieldsMatchOne() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchOne
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document among many')
+    void writeFirstByFieldsMatchMany() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchMany
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields retrieves a matching document among many (ordered)')
+    void writeFirstByFieldsMatchOrdered() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeFirstByFieldsMatchOrdered
+    }
+
+    @Test
+    @DisplayName('writeFirstByFields returns null when no document matches')
+    void writeFirstByFieldsNoMatch() {
+        new SQLiteDB().withCloseable JsonFunctions.&writeFirstByFieldsNoMatch
+    }
+
+    @Test
+    @DisplayName('writeFirstByContains fails')
+    void writeFirstByContainsFails() {
+        new SQLiteDB().withCloseable { db ->
+            assertThrows(DocumentException) { JsonFunctions.writeFirstByContainsMatchOne db }
+        }
+    }
+
+    @Test
+    @DisplayName('writeFirstByJsonPath fails')
+    void writeFirstByJsonPathFails() {
+        new SQLiteDB().withCloseable { db ->
+            assertThrows(DocumentException) { JsonFunctions.writeFirstByJsonPathMatchOne db }
+        }
+    }
 }