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Java Unit Testing with JUnit 5

assertSame() method

Understand how to use the assertSame() method in JUnit 5 to verify that two references point to the exact same object. This lesson covers different overloaded assertSame methods with examples demonstrating passing and failing test cases, including custom messages for failures.

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assertSame() method

Assertions API provide static assertSame() method. This method helps us in validating that expected and actualrefer to the exact same object. JUnit uses == operator to perform this assert.

  • If the actual and expected value refers to the same object then the test case will pass.
  • If the actual and expected value does not refer to the same object then the test case will fail.

There are basically three useful overloaded methods for assertSame:-

Java
public static void assertSame(Object expected, Object actual)
  
public static void assertSame(Object expected, Object actual, String message)
  
public static void assertSame(Object expected, Object actual, Supplier<String> messageSupplier)

Demo

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