alpreu commented on code in PR #19660:
URL: https://github.com/apache/flink/pull/19660#discussion_r870126105


##########
flink-connectors/flink-connector-base/src/test/java/org/apache/flink/connector/base/source/reader/SourceMetricsITCase.java:
##########
@@ -169,45 +168,47 @@ private void assertSourceMetrics(
             boolean hasTimestamps) {
         List<OperatorMetricGroup> groups =
                 reporter.findOperatorMetricGroups(jobId, 
"MetricTestingSource");
-        assertThat(groups, hasSize(parallelism));
+        assertThat(groups).hasSize(parallelism);
 
         int subtaskWithMetrics = 0;
         for (OperatorMetricGroup group : groups) {
             Map<String, Metric> metrics = reporter.getMetricsByGroup(group);
             // there are only 2 splits assigned; so two groups will not update 
metrics
             if (group.getIOMetricGroup().getNumRecordsInCounter().getCount() 
== 0) {
                 // assert that optional metrics are not initialized when no 
split assigned
-                assertThat(
-                        metrics.get(MetricNames.CURRENT_EMIT_EVENT_TIME_LAG),
-                        
isGauge(equalTo(InternalSourceReaderMetricGroup.UNDEFINED)));
-                assertThat(metrics.get(MetricNames.WATERMARK_LAG), 
nullValue());
+                
assertThat(metrics.get(MetricNames.CURRENT_EMIT_EVENT_TIME_LAG))
+                        .satisfies(
+                                matching(
+                                        isGauge(
+                                                equalTo(
+                                                        
InternalSourceReaderMetricGroup
+                                                                .UNDEFINED))));
+                assertThat(metrics.get(MetricNames.WATERMARK_LAG)).isNull();
                 continue;
             }
             subtaskWithMetrics++;
             // I/O metrics
-            assertThat(
-                    group.getIOMetricGroup().getNumRecordsInCounter(),
-                    isCounter(equalTo(processedRecordsPerSubtask)));
-            assertThat(
-                    group.getIOMetricGroup().getNumBytesInCounter(),
-                    isCounter(
-                            equalTo(
-                                    processedRecordsPerSubtask
-                                            * 
MockRecordEmitter.RECORD_SIZE_IN_BYTES)));
+            assertThat(group.getIOMetricGroup().getNumRecordsInCounter())
+                    
.satisfies(matching(isCounter(equalTo(processedRecordsPerSubtask))));
+            assertThat(group.getIOMetricGroup().getNumBytesInCounter())
+                    .satisfies(
+                            matching(
+                                    isCounter(
+                                            equalTo(
+                                                    processedRecordsPerSubtask
+                                                            * MockRecordEmitter
+                                                                    
.RECORD_SIZE_IN_BYTES))));
             // MockRecordEmitter is just incrementing errors every even record
-            assertThat(
-                    metrics.get(MetricNames.NUM_RECORDS_IN_ERRORS),
-                    isCounter(equalTo(processedRecordsPerSubtask / 2)));
+            assertThat(metrics.get(MetricNames.NUM_RECORDS_IN_ERRORS))
+                    
.satisfies(matching(isCounter(equalTo(processedRecordsPerSubtask / 2))));

Review Comment:
   I tried creating a equivalent solution using AssertJs custom assertions now



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