[AVRO-2943] Add new GenericData String/Utf8 ARRAY comparison test (#2137

)

GenericRecord comparison already handles String vs Utf8 for ARRAY elements.
This just adds a unit test to explicitly verify the current correct behaviour.

Also renamed GenericData String/Utf8 MAP unit tests which were added
on #974 to improve
clarity on what those tests are actually verifying.

https://issues.apache.org/jira/browse/AVRO-2943

lang/java/avro/src/test/java/org/apache/avro/generic/TestGenericData.java

@@ -157,9 +157,8 @@ void testEquals() {
   }
 
   @Test
-  public void testMapKeyEquals() {
-    Schema mapSchema = new Schema.Parser().parse("{\"type\": \"map\", \"values\": \"string\"}");
-    Field myMapField = new Field("my_map", Schema.createMap(mapSchema), null, null);
+  public void testMapKeyEqualsStringAndUtf8Compatibility() {
+    Field myMapField = new Field("my_map", Schema.createMap(Schema.create(Schema.Type.STRING)), null, null);
     Schema schema = Schema.createRecord("my_record", "doc", "mytest", false);
     schema.setFields(Arrays.asList(myMapField));
     GenericRecord r0 = new GenericData.Record(schema);
@@ -178,9 +177,8 @@ public void testMapKeyEquals() {
   }
 
   @Test
-  public void testMapValuesEquals() {
-    Schema mapSchema = new Schema.Parser().parse("{\"type\": \"map\", \"values\": \"string\"}");
-    Field myMapField = new Field("my_map", Schema.createMap(mapSchema), null, null);
+  public void testMapValuesEqualsStringAndUtf8Compatibility() {
+    Field myMapField = new Field("my_map", Schema.createMap(Schema.create(Schema.Type.STRING)), null, null);
     Schema schema = Schema.createRecord("my_record", "doc", "mytest", false);
     schema.setFields(Arrays.asList(myMapField));
     GenericRecord r0 = new GenericData.Record(schema);
@@ -198,6 +196,24 @@ public void testMapValuesEquals() {
     assertEquals(r1, r0);
   }
 
+  @Test
+  public void testArrayValuesEqualsStringAndUtf8Compatibility() {
+    Field myArrayField = new Field("my_array", Schema.createArray(Schema.create(Schema.Type.STRING)), null, null);
+    Schema schema = Schema.createRecord("my_record", "doc", "mytest", false);
+    schema.setFields(Arrays.asList(myArrayField));
+    GenericRecord r0 = new GenericData.Record(schema);
+    GenericRecord r1 = new GenericData.Record(schema);
+
+    List<CharSequence> array1 = Arrays.asList("valueOne");
+    r0.put("my_array", array1);
+
+    List<CharSequence> array2 = Arrays.asList(new Utf8("valueOne"));
+    r1.put("my_array", array2);
+
+    assertEquals(r0, r1);
+    assertEquals(r1, r0);
+  }
+
   private Schema recordSchema() {
     List<Field> fields = new ArrayList<>();
     fields.add(new Field("anArray", Schema.createArray(Schema.create(Type.STRING)), null, null));