src/main/java/org/fest/assertions/internal/Files.java
public void assertIsDirectory(Description description, File actual) {
    assertNotNull(description, actual);
    if (!actual.isDirectory()) {
      String format = "expecting path:<%s> to represent an existing directory";
      throw failures.failure(description, new BasicErrorMessageFactory(format, actual));
    }
  }
public void assertIsDirectory(Description description, File actual) {
    assertNotNull(description, actual);
    if (!actual.isDirectory()) {
      String format = "expecting path:<%s> to represent an existing directory";
      throw failures.failure(description, new BasicErrorMessageFactory(format, actual));
    }
  }
public void assertIsDirectory ( Description description , File actual ) { assertNotNull ( description , actual ) ; if ( ! actual . isDirectory ( ) ) { String format = "expecting path:<%s> to represent an existing directory" ; throw failures . failure ( description , new BasicErrorMessageFactory ( format , actual ) ) ; } }
Asserts that the <em>actual</em> {@code File} represents an existing directory.

@param description the description of the <em>actual</em> {@code File}.
@param actual the <em>actual</em> {@code File}.
@throws AssertionError if the <em>actual</em> {@code File} is {@code null}.
@throws AssertionError if the <em>actual</em> {@code File} does not represent an existing directory.
Asserts that the <em > actual< / em > { @code File } represents an existing directory .