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Document JUnit 4 message parameter #500

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Document JUnit 4 message parameter #500

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4 changes: 3 additions & 1 deletion content/languages/java/junit.md
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Expand Up @@ -7,6 +7,8 @@ You can use JUnit [4](https://junit.org/junit4/) or [5](https://junit.org/junit5

Note that JUnit assertions use `(expected, actual)` parameter ordering rather than the typical `(actual, expected)`.

Also note that the order of the optional `message` parameter is swapped between JUnit 4 and 5: in JUnit 4 the order is `(message, expected, actual)`; while in JUnit5 it is `(expected, actual, message)`.

## Basic Setup

### Example solution
Expand All @@ -28,7 +30,7 @@ import static org.junit.Assert.assertEquals;
public class AdderTests {
@Test
public void testAdd() {
assertEquals(3, Adder.add(1, 2));
assertEquals("1 + 2 should equal 3", 3, Adder.add(1, 2));
}
}
```
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