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Testing / JUnit6 Interview Questions

What are assumptions in JUnit 6 and how do they differ from assertions?

Assumptions abort a test silently (marking it as aborted) when a condition is not met. Assertions fail the test with a failure when a condition is not met. Use assumptions to skip tests that are irrelevant in the current environment rather than to verify business logic.

import static org.junit.jupiter.api.Assumptions.*;

class AssumptionsDemo {

    @Test
    void runOnlyOnLinux() {
        assumeTrue(System.getProperty("os.name").toLowerCase().contains("linux"),
            "Skipped: not running on Linux");
        // Test body: only executes on Linux
        // On Windows/macOS: test is ABORTED (not failed)
    }

    @Test
    void runOnlyInCiEnvironment() {
        // assumingThat: execute body only if condition true; continue otherwise
        assumingThat(
            "CI".equals(System.getenv("ENV")),
            () -> {
                // This block runs only in CI
                verifyDeploymentHealth();
            }
        );
        // This line always runs regardless of the assumption
        assertEquals(1, 1);
    }

    @Test
    void skipOnNullDatabase() {
        assumeFalse(System.getenv("DB_URL") == null,
            "Skipped: DB_URL not configured");
        // Integration test body
    }
}

Assumptions vs Assertions comparison
AspectAssumptionsAssertions
Failure modeTest aborted (grey in reports)Test failed (red in reports)
Use caseSkip irrelevant test in current environmentVerify correctness of production logic
MethodsassumeTrue, assumeFalse, assumingThatassertEquals, assertTrue, assertThrows etc.
Effect on suiteSkipped: does not count as pass or failFailure: counts against the build
What is the result of a test when an assumption fails in JUnit 6?
What does assumingThat() do differently from assumeTrue()?

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