FrankYang0529 commented on code in PR #19449:
URL: https://github.com/apache/kafka/pull/19449#discussion_r2042064492


##########
connect/json/src/test/java/org/apache/kafka/connect/json/JsonConverterTest.java:
##########
@@ -978,6 +978,39 @@ public void testVersionRetrievedFromAppInfoParser() {
         assertEquals(AppInfoParser.getVersion(), converter.version());
     }
 
+    @Test
+    public void testSchemaContentIsNull() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 null), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentIsEmptyString() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 ""), false);

Review Comment:
   nit: `Collections.singletonMap` -> `Map.of`.



##########
connect/json/src/test/java/org/apache/kafka/connect/json/JsonConverterTest.java:
##########
@@ -978,6 +978,39 @@ public void testVersionRetrievedFromAppInfoParser() {
         assertEquals(AppInfoParser.getVersion(), converter.version());
     }
 
+    @Test
+    public void testSchemaContentIsNull() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 null), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentIsEmptyString() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 ""), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentValidSchema() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"type\": \"string\" }"), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "\"foo-bar-baz\"".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentInValidSchema() {
+        assertThrows(
+            DataException.class,
+            () -> 
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"string\" }"), false),
+            " Provided schema is invalid , please recheck the schema you have 
provided");
+    }
+
+    @Test
+    public void testSchemaContentLooksLikeSchema() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"type\": \"struct\", \"fields\": [{\"field\": \"schema\", \"type\": 
\"struct\",\"fields\": [{\"field\": \"type\", \"type\": \"string\" }]}, 
{\"field\": \"payload\", \"type\": \"string\"}]}"), false);

Review Comment:
   ditto



##########
connect/json/src/test/java/org/apache/kafka/connect/json/JsonConverterTest.java:
##########
@@ -978,6 +978,39 @@ public void testVersionRetrievedFromAppInfoParser() {
         assertEquals(AppInfoParser.getVersion(), converter.version());
     }
 
+    @Test
+    public void testSchemaContentIsNull() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 null), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentIsEmptyString() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 ""), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentValidSchema() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"type\": \"string\" }"), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "\"foo-bar-baz\"".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentInValidSchema() {
+        assertThrows(
+            DataException.class,
+            () -> 
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"string\" }"), false),

Review Comment:
   ditto



##########
connect/json/src/test/java/org/apache/kafka/connect/json/JsonConverterTest.java:
##########
@@ -978,6 +978,39 @@ public void testVersionRetrievedFromAppInfoParser() {
         assertEquals(AppInfoParser.getVersion(), converter.version());
     }
 
+    @Test
+    public void testSchemaContentIsNull() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 null), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentIsEmptyString() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 ""), false);
+        assertEquals(new SchemaAndValue(Schema.STRING_SCHEMA, "foo-bar-baz"), 
converter.toConnectData(TOPIC, "{ \"schema\": { \"type\": \"string\" }, 
\"payload\": \"foo-bar-baz\" }".getBytes()));
+    }
+
+    @Test
+    public void testSchemaContentValidSchema() {
+        
converter.configure(Collections.singletonMap(JsonConverterConfig.SCHEMA_CONTENT_CONFIG,
 "{ \"type\": \"string\" }"), false);

Review Comment:
   ditto



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