snuyanzin commented on code in PR #28497:
URL: https://github.com/apache/flink/pull/28497#discussion_r3454289962


##########
flink-fs-tests/src/test/java/org/apache/flink/hdfstests/ContinuousFileProcessingTest.java:
##########
@@ -339,13 +339,13 @@ public void testReaderSnapshotRestore() throws Exception {
         // compare if the results contain what they should contain and also if
         // they are the same, as they should.
 
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit1)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit2)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit3)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit4)));
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit1))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit2))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit3))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit4))).isTrue();

Review Comment:
   assert has contains method, so no need for `isTrue`



##########
flink-fs-tests/src/test/java/org/apache/flink/hdfstests/ContinuousFileProcessingTest.java:
##########
@@ -339,13 +339,13 @@ public void testReaderSnapshotRestore() throws Exception {
         // compare if the results contain what they should contain and also if
         // they are the same, as they should.
 
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit1)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit2)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit3)));
-        Assert.assertTrue(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit4)));
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit1))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit2))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit3))).isTrue();
+        assertThat(initTestInstance.getOutput().contains(new 
StreamRecord<>(fsSplit4))).isTrue();
 
-        Assert.assertArrayEquals(
-                initTestInstance.getOutput().toArray(), 
restoredTestInstance.getOutput().toArray());
+        assertThat(restoredTestInstance.getOutput().toArray())

Review Comment:
   what is the reason to convert to array here?



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