---
title: 10. Reference Test
---
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This test checks if references functionality, implemented in the [Reference Contributor](/tutorials/custom_language_support/reference_contributor.md) section of the Custom Language Support Tutorial, works as expected.

## 10.1. Define Test Data
This test reuses the Simple Language properties file `DefaultTestData.simple`.

Create the test file `ReferenceTestData.java` in the `testData` directory.
This file has one Simple Language prefix and key, with the caret placed after the key.

```java
{% include /code_samples/simple_language_plugin/src/test/testData/ReferenceTestData.java %}
```

## 10.2. Define a Test Method
Add the `testReference()` method to the `SimpleCodeInsightTest` class [previously defined](completion_test.md#define-a-test).
This test is configured by the test files.
The fixture gets the `PsiElement` at the caret, then compares its value with the known value of that key.

```java
  public void testReference() {
    myFixture.configureByFiles("ReferenceTestData.java", "DefaultTestData.simple");
    PsiElement element = myFixture.getFile().findElementAt(myFixture.getCaretOffset()).getParent();
    assertEquals("https://en.wikipedia.org/", ((SimpleProperty) element.getReferences()[0].resolve()).getValue());
  }
```

## 10.3. Run the Test
[Run](completion_test.md#run-the-test) the test and make sure it's green.