Comparing arrays in JUnit assertions concise built-in way

Question

Is there a concise  built-in way to do equals assertions on two like-typed arrays in JUnit   By default  at least in JUnit 4  it seems to do an instance compare on the array object itself   EG  doesn t work   int   expectedResult   new int     116800   116800    int   result   new GraphixMask   sortedAreas rectangles   assertEquals expectedResult  result     Of course  I can do it manually with   assertEquals expectedResult length  result length   for  int i   0  i  lt  expectedResult length  i        assertEquals  mismatch at     i  expectedResult i   result i        but is there a better way

User · Answer

You can use Arrays equals       assertTrue Arrays equals expectedResult  result

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Class Assertions in org junit jupiter api Use  public static void assertArrayEquals int   expected                                       int   actual

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I prefer to convert arrays to strings   Assert assertEquals                  Arrays toString values                   Arrays toString new int     7  8  9  3        this way I can see clearly where wrong values are  This works effectively only for small sized arrays  but I rarely use arrays with more items than 7 in my unit tests   This method works for primitive types and for other types when overload of toString returns all essential information

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Use org junit Assert s method assertArrayEquals   import org junit Assert       Assert assertArrayEquals  expectedResult  result      If this method is not available  you may have accidentally imported the Assert class from junit framework

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Using junit4 and Hamcrest you get a concise method of comparing arrays  It also  gives details of where the error is in the failure trace   import static org junit Assert   import static org hamcrest CoreMatchers            assertThat result  is new int    56  100  2000       Failure Trace output   java lang AssertionError      Expected  is   lt 56 gt    lt 100 gt    lt 2000 gt      but  was   lt 55 gt    lt 100 gt    lt 2000 gt

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Assert assertArrayEquals  message   expectedResult  result

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I know the question is for JUnit4  but if you happen to be stuck at JUnit3  you could create a short utility function like that   private void assertArrayEquals Object   esperado  Object   real        assertEquals Arrays asList esperado   Arrays asList real             In JUnit3  this is better than directly comparing the arrays  since it will detail exactly which elements are different

[java] Comparing arrays in JUnit assertions, concise built-in way?

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