src/main/java/org/fest/assertions/FileAssert.java
public @NotNull FileAssert isRelative() {
    isNotNull();
    if (!actual.isAbsolute()) {
      return this;
    }
    failIfCustomMessageIsSet();
    throw failure(format("file:<%s> should be a relative path", actual));
  }
public @NotNull FileAssert isRelative() {
    isNotNull();
    if (!actual.isAbsolute()) {
      return this;
    }
    failIfCustomMessageIsSet();
    throw failure(format("file:<%s> should be a relative path", actual));
  }
public @ NotNull FileAssert isRelative ( ) { isNotNull ( ) ; if ( ! actual . isAbsolute ( ) ) { return this ; } failIfCustomMessageIsSet ( ) ; throw failure ( format ( "file:<%s> should be a relative path" , actual ) ) ; }
Verifies that the actual {@code File} is a relative path.

@return this assertion object.
@throws AssertionError if the actual {@code File} is not a relative path.
Verifies that the actual { @code File } is a relative path .