Make tests more stable by using JSONAssert equals (apache#6435)

Similar to the change you already merged for AvroSchemaTest.java(apache#6247):
`jsonSchema.getSchemaInfo().getSchema()` in `pulsar-client/src/test/java/org/apache/pulsar/client/impl/schema/JSONSchemaTest.java` returns a JSON object. `schemaJson` compares with hard-coded JSON String. However, the order of entries in `schemaJson` is not guaranteed. Similarly, test `testKeyValueSchemaInfoToString` in `pulsar-client/src/test/java/org/apache/pulsar/client/impl/schema/KeyValueSchemaInfoTest.java` returns a JSON object. `havePrimitiveType` compares with hard-coded JSON String, and the order of entries in `havePrimitiveType` is not guaranteed.


This PR proposes to use JSONAssert and modify the corresponding JSON test assertions so that the test is more stable.

### Motivation

Using JSONAssert and modifying the corresponding JSON test assertions so that the test is more stable.

### Modifications

Adding `assertJSONEqual` method and replacing `assertEquals` with it in tests `testAllowNullSchema`, `testNotAllowNullSchema` and `testKeyValueSchemaInfoToString`.

pulsar-client/src/test/java/org/apache/pulsar/client/impl/schema/JSONSchemaTest.java

@@ -33,8 +33,10 @@
 import org.apache.pulsar.client.impl.schema.SchemaTestUtils.NestedBar;
 import org.apache.pulsar.client.impl.schema.SchemaTestUtils.NestedBarList;
 import org.apache.pulsar.common.schema.SchemaType;
+import org.skyscreamer.jsonassert.JSONAssert;
 import org.testng.Assert;
 import org.testng.annotations.Test;
+import org.json.JSONException;
 
 import static org.apache.pulsar.client.impl.schema.SchemaTestUtils.FOO_FIELDS;
 import static org.apache.pulsar.client.impl.schema.SchemaTestUtils.SCHEMA_JSON_NOT_ALLOW_NULL;
@@ -44,13 +46,16 @@
 @Slf4j
 public class JSONSchemaTest {
 
+    public static void assertJSONEqual(String s1, String s2) throws JSONException{
+        JSONAssert.assertEquals(s1, s2, false);
+    }
     @Test
-    public void testNotAllowNullSchema() {
+    public void testNotAllowNullSchema() throws JSONException {
         JSONSchema<Foo> jsonSchema = JSONSchema.of(SchemaDefinition.<Foo>builder().withPojo(Foo.class).withAlwaysAllowNull(false).build());
         Assert.assertEquals(jsonSchema.getSchemaInfo().getType(), SchemaType.JSON);
         Schema.Parser parser = new Schema.Parser();
         String schemaJson = new String(jsonSchema.getSchemaInfo().getSchema());
-        Assert.assertEquals(schemaJson, SCHEMA_JSON_NOT_ALLOW_NULL);
+        assertJSONEqual(schemaJson, SCHEMA_JSON_NOT_ALLOW_NULL);
         Schema schema = parser.parse(schemaJson);
 
         for (String fieldName : FOO_FIELDS) {
@@ -67,13 +72,13 @@ public void testNotAllowNullSchema() {
     }
 
     @Test
-    public void testAllowNullSchema() {
+    public void testAllowNullSchema() throws JSONException {
         JSONSchema<Foo> jsonSchema = JSONSchema.of(SchemaDefinition.<Foo>builder().withPojo(Foo.class).build());
         Assert.assertEquals(jsonSchema.getSchemaInfo().getType(), SchemaType.JSON);
         Schema.Parser parser = new Schema.Parser();
         parser.setValidateDefaults(false);
         String schemaJson = new String(jsonSchema.getSchemaInfo().getSchema());
-        Assert.assertEquals(schemaJson, SCHEMA_JSON_ALLOW_NULL);
+        assertJSONEqual(schemaJson, SCHEMA_JSON_ALLOW_NULL);
         Schema schema = parser.parse(schemaJson);
 
         for (String fieldName : FOO_FIELDS) {

pulsar-client/src/test/java/org/apache/pulsar/client/impl/schema/KeyValueSchemaInfoTest.java

@@ -38,6 +38,7 @@
 import org.apache.pulsar.common.schema.KeyValueEncodingType;
 import org.apache.pulsar.common.schema.SchemaInfo;
 import org.apache.pulsar.common.schema.SchemaType;
+import org.json.JSONException;
 import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
 
@@ -209,18 +210,18 @@ public void testKeyValueSchemaInfoBackwardCompatibility() {
     }
 
     @Test
-    public void testKeyValueSchemaInfoToString() {
+    public void testKeyValueSchemaInfoToString() throws JSONException {
         String havePrimitiveType = DefaultImplementation
                 .convertKeyValueSchemaInfoDataToString(KeyValueSchemaInfo
                         .decodeKeyValueSchemaInfo(Schema.KeyValue(Schema.AVRO(Foo.class), Schema.STRING)
                                 .getSchemaInfo()));
-        assertEquals(havePrimitiveType, KEY_VALUE_SCHEMA_INFO_INCLUDE_PRIMITIVE);
+        JSONSchemaTest.assertJSONEqual(havePrimitiveType, KEY_VALUE_SCHEMA_INFO_INCLUDE_PRIMITIVE);
 
         String notHavePrimitiveType = DefaultImplementation
                 .convertKeyValueSchemaInfoDataToString(KeyValueSchemaInfo
                         .decodeKeyValueSchemaInfo(Schema.KeyValue(Schema.AVRO(Foo.class),
                                 Schema.AVRO(Foo.class)).getSchemaInfo()));
-        assertEquals(notHavePrimitiveType, KEY_VALUE_SCHEMA_INFO_NOT_INCLUDE_PRIMITIVE);
+        JSONSchemaTest.assertJSONEqual(notHavePrimitiveType, KEY_VALUE_SCHEMA_INFO_NOT_INCLUDE_PRIMITIVE);
     }
 
 }