While some ``++TestRule++`` classes have the desired effect without ever being directly referenced by a test, several others do not, and there's no reason to leave them cluttering up the file if they're not in use.


This rule raises an issue when ``++Test++`` class fields of the following types aren't used by any of the test methods: ``++TemporaryFolder++``, and ``++TestName++``.

This rule also applies to the JUnit 5 equivalent classes: ``++TempDir++``, and ``++TestInfo++``.


== Noncompliant Code Example

----
public class ProjectDefinitionTest {

  @Rule
  public TemporaryFolder temp = new TemporaryFolder();  // Noncompliant

  @Test
  public void shouldSetKey() {
    ProjectDefinition def = ProjectDefinition.create();
    def.setKey("mykey");
    assertThat(def.getKey(), is("mykey"));
  }
}
----


== Compliant Solution

----
public class ProjectDefinitionTest {

  @Test
  public void shouldSetKey() {
    ProjectDefinition def = ProjectDefinition.create();
    def.setKey("mykey");
    assertThat(def.getKey(), is("mykey"));
  }
}
----



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'''
== Implementation Specification
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include::message.adoc[]

'''
== Comments And Links
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include::comments-and-links.adoc[]
endif::env-github,rspecator-view[]