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In JUnit Jupiter, statically import assertTrue from org.junit.jupiter.api.Assertions and pass it a boolean condition. Add an optional failure message after the condition. JUnit 4 uses a different import and puts the message first, so check which framework your project uses before copying an example.
Use assertTrue in a JUnit Jupiter test
Add the static import, then call assertTrue(condition) inside a test method. This example assumes the project already has JUnit Jupiter on its test classpath:
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;
class ValidationTest {
@Test
void resultIsValid() {
boolean valid = validateResult();
assertTrue(valid);
}
private boolean validateResult() {
return true;
}
}The assertion passes when the condition is true. If it is false, JUnit fails the test with an assertion error. Jupiter 5.14.2 documents overloads for a boolean condition and a BooleanSupplier condition in its Assertions API.
Add a useful failure message
Pass a string after the condition in Jupiter. The message appears when the assertion fails, helping explain what the test expected.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallassertTrue(actualCount > 0, "expected at least one result");If constructing the message is expensive, pass a supplier instead. JUnit can defer building the message until it is needed:
assertTrue(valid, () -> "result details: " + buildDiagnostic());The Jupiter API documents lazy retrieval for Supplier<String> messages. The JUnit 5.6.0 User Guide also demonstrates this form with a comparison: assertTrue('a' < 'b', () -> "Assertion messages can be lazily evaluated -- " + "to avoid constructing complex messages unnecessarily.") (JUnit 5.6.0 User Guide).
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Check whether the project uses JUnit 4 or Jupiter
The framework version determines both the import and where the optional message goes. These examples are not interchangeable:
| Framework | Import | Message form |
|---|---|---|
| JUnit 4.12 | org.junit.Assert.assertTrue |
assertTrue("message", condition) |
| JUnit Jupiter | org.junit.jupiter.api.Assertions.assertTrue |
assertTrue(condition, "message") |
JUnit 4.12 documents the message-before-condition overload and says a false condition throws an AssertionError with the supplied message (JUnit 4.12 Assert Javadoc). Jupiter 5.14.2 places the message after the condition in its corresponding overload. If you see an argument-order or import error, inspect the package on your static import and the JUnit dependency configured for the test source set.
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Choose an assertion that expresses the test
assertTrue is a natural fit when the behavior under test is a boolean predicate, such as a validity check or range condition. A comparison can be passed directly:
assertTrue(actualCount > 0, "expected at least one result");When the test is fundamentally checking that an expected value equals an actual value, use a more specific equality assertion if available. It communicates the intent more clearly than forcing the comparison into a boolean assertion.
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Common problems
- Cannot resolve
assertTrue: add the correct static import for the framework in use and verify JUnit is available to the test source set. - Message and condition appear reversed: Jupiter takes the condition first; JUnit 4’s documented overload takes the message first. Check the import and dependency rather than swapping arguments at random.
- The test fails with an assertion error: the supplied condition evaluated to false. Inspect the actual value or predicate inputs; add a failure message that states the expectation.
- Diagnostic formatting is costly: use Jupiter’s message-supplier overload so the diagnostic is built only when necessary.
- The assertion obscures the intent: if the test compares two values, prefer an equality assertion rather than expressing the comparison as a generic true/false condition.
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