twalthr commented on code in PR #19262:
URL: https://github.com/apache/flink/pull/19262#discussion_r867705630


##########
flink-table/flink-table-runtime/src/test/java/org/apache/flink/table/data/DataStructureConvertersTest.java:
##########
@@ -367,36 +365,40 @@ public static List<TestSpec> testData() {
 
     @Parameter public TestSpec testSpec;
 
-    @Rule public ExpectedException thrown = ExpectedException.none();
-
     @Test
     public void testConversions() {
-        if (testSpec.expectedErrorMessage != null) {
-            thrown.expect(TableException.class);
-            thrown.expectMessage(equalTo(testSpec.expectedErrorMessage));
-        }
         for (Map.Entry<Class<?>, Object> from : 
testSpec.conversions.entrySet()) {
             final DataType fromDataType = 
testSpec.dataType.bridgedTo(from.getKey());
 
-            final DataStructureConverter<Object, Object> fromConverter =
-                    
simulateSerialization(DataStructureConverters.getConverter(fromDataType));
-            
fromConverter.open(DataStructureConvertersTest.class.getClassLoader());
-
-            final Object internalValue = 
fromConverter.toInternalOrNull(from.getValue());
-
-            final Object anotherValue = 
testSpec.conversionsWithAnotherValue.get(from.getKey());
-            if (anotherValue != null) {
-                fromConverter.toInternalOrNull(anotherValue);
-            }
-
-            for (Map.Entry<Class<?>, Object> to : 
testSpec.conversions.entrySet()) {
-                final DataType toDataType = 
testSpec.dataType.bridgedTo(to.getKey());
-
-                final DataStructureConverter<Object, Object> toConverter =
-                        
simulateSerialization(DataStructureConverters.getConverter(toDataType));
-                
toConverter.open(DataStructureConvertersTest.class.getClassLoader());
-
-                
assertThat(toConverter.toExternalOrNull(internalValue)).isEqualTo(to.getValue());
+            if (testSpec.expectedErrorMessage != null) {
+                assertThatThrownBy(
+                                () ->
+                                        simulateSerialization(

Review Comment:
   remove in the `simulateSerialization` in this case



##########
flink-table/flink-table-runtime/src/test/java/org/apache/flink/table/runtime/typeutils/RowDataSerializerTest.java:
##########
@@ -347,26 +345,24 @@ public void testCopy() {
 
     @Test
     public void testWrongCopy() {
-        thrown.expect(IllegalArgumentException.class);
-        serializer.copy(new GenericRowData(serializer.getArity() + 1));
+        assertThatThrownBy(() -> serializer.copy(new 
GenericRowData(serializer.getArity() + 1)))
+                .isInstanceOf(IllegalArgumentException.class);
     }
 
     @Test
     public void testWrongCopyReuse() {
-        thrown.expect(IllegalArgumentException.class);
         for (RowData row : testData) {
-            checkDeepEquals(
-                    row, serializer.copy(row, new 
GenericRowData(row.getArity() + 1)), false);
+            assertThatThrownBy(
+                            () ->
+                                    checkDeepEquals(
+                                            row,
+                                            serializer.copy(
+                                                    row, new 
GenericRowData(row.getArity() + 1)),
+                                            false))
+                    .isInstanceOf(IllegalArgumentException.class);
         }
     }
 
     /** Class used for concurrent testing with KryoSerializer. */
-    private static class WrappedString {

Review Comment:
   I'm sure this had a deeper meaning. Let's keep it.



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