What is the difference between assertThat and assertEquals?

assertEquals() is the method of Assert class in JUnit, assertThat() belongs to Matchers class of Hamcrest. Both methods assert the same thing; however, hamcrest matcher is more human-readable. As you see, it is like an English sentence “Assert that actual is equal to the expected value”.

How do you assert objects in JUnit?

The assertSame() method tests if two object references point to the same object. The assertNotSame() method tests if two object references do not point to the same object. void assertArrayEquals(expectedArray, resultArray); The assertArrayEquals() method will test whether two arrays are equal to each other.

What is use of assertEquals?

There is a method called assertEquals in the JUnit library that can be used to check if two objects is equally defined or not. It can be used to check if a specific instance of an object is expected on a method called by the test, or if na object passed through a method was “polymorphed” correctly.

Is assertThat deprecated?

assertThat method is deprecated. Its sole purpose is to forward the call to the MatcherAssert. assertThat defined in Hamcrest 1.3. Therefore, it is recommended to directly use the equivalent assertion defined in the third party Hamcrest library.

What is assertThat in JUnit?

The assertThat is one of the JUnit methods from the Assert object that can be used to check if a specific value match to an expected one. It primarily accepts 2 parameters. First one if the actual value and the second is a matcher object.

What is the difference between assertTrue and assertEquals?

AssertEquals method compares the expected result with that of the actual result. It throws an AssertionError if the expected result does not match with that of the actual result and terminates the program execution at the assertequals method. AssertTrue method asserts that a specified condition is true.

What is Delta in assertEquals?

delta – the maximum delta between expected and actual for which both numbers are still considered equal. It’s probably overkill, but I typically use a really small number, e.g. private static final double DELTA = 1e-15; @Test public void testDelta(){ assertEquals(123.456, 123.456, DELTA); }

How does assertEquals work in Java?

assertEquals. Asserts that two objects are equal. If they are not, an AssertionError is thrown with the given message. If expected and actual are null , they are considered equal.

What does assertEquals return in Java?

equals(Object) . For example, assertEquals() might immediately return true when provided the same object for the expected and actual values, without calling equals(Object) at all. Tests that aim to verify the equals(Object) implementation should instead be written to explicitly verify the Object.