source: class ContextsTest  {
  
    @Test
    public void get_missing()
    {
  
target:     final IllegalStateException exception =
        expectThrows( IllegalStateException.class, () -> Contexts.get( Runnable.class, "someQual" ) );
  
      assertEquals( exception.getMessage(),
                    "Attempting to retrieve React context with type interface java.lang.Runnable and qualifier 'someQual' but no such context exists with that type and name" );
    }
  
  }