CODEWITHSUNDEEP
javajunit5
Ioannis Noukakis
Ioannis Noukakis

Reputation: 361

Is there a way to expect a timeout?

Currently, I'm writing some integration tests and I need to assert that a call to a method blocked the calling thread for at least x seconds. The thing is I have method that will block forever and I need to assert that it has been blocked for at least x seconds. Is there any way to do that? The only other answer is about JUnit4 and we are using JUnit 5... In advance thank you for your answer.

Upvotes: 2

Views: 1184

Answers (2)

Ioannis Noukakis
Ioannis Noukakis

Reputation: 361

In the end, I opted for a different strategy. You see my use case is to test if some JDBC Postgres transactions would block. Instead, I'll just wait that the transaction timeout to kick in and assert the time between the beginning of my test and when the timeout triggered. Thank you all for taking some valuable time to answer my question.

Upvotes: 0

oktaykcr
oktaykcr

Reputation: 376

You can use assertTimeout(Duration timeout, Executable executable) for your problem. For more info, you should visit JUnit 5 User Guide.

    @Test
    void timeoutNotExceeded() {
        // The following assertion succeeds.
        assertTimeout(ofMinutes(2), () -> {
            // Perform task that takes less than 2 minutes.
        });
    }

    @Test
    void timeoutNotExceededWithResult() {
        // The following assertion succeeds, and returns the supplied object.
        String actualResult = assertTimeout(ofMinutes(2), () -> {
            return "a result";
        });
        assertEquals("a result", actualResult);
    }

    @Test
    void timeoutNotExceededWithMethod() {
        // The following assertion invokes a method reference and returns an object.
        String actualGreeting = assertTimeout(ofMinutes(2), AssertionsDemo::greeting);
        assertEquals("Hello, World!", actualGreeting);
    }

    @Test
    void timeoutExceeded() {
        // The following assertion fails with an error message similar to:
        // execution exceeded timeout of 10 ms by 91 ms
        assertTimeout(ofMillis(10), () -> {
            // Simulate task that takes more than 10 ms.
            Thread.sleep(100);
        });
    }

    @Test
    void timeoutExceededWithPreemptiveTermination() {
        // The following assertion fails with an error message similar to:
        // execution timed out after 10 ms
        assertTimeoutPreemptively(ofMillis(10), () -> {
            // Simulate task that takes more than 10 ms.
            new CountDownLatch(1).await();
        });
    }

Upvotes: 4

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