public Set<Analysis.AliasedDataSource> extractDataSources(final AstNode node) {
    new Visitor().process(node, null);
    return getAllSources();
  }
@Test
  public void shouldExtractUnaliasedDataSources() {
    // Given:
    final AstNode stmt = givenQuery("SELECT * FROM TEST1;");

    // When:
    extractor.extractDataSources(stmt);

    // Then:
    assertContainsAlias(TEST1);
  }