Examples of com.google.javascript.rhino.Node.checkTreeEquals()

com.google.javascript.rhino.Node.checkTreeEquals()
Checks if the subtree under this node is the same as another subtree. Returns null if it's equal, or a message describing the differences. Should be called with {@code this} as the "expected" node and{@code actual} as the "actual" node.

      Node normalizeCheckExternsRootClone = root.getFirstChild();
      Node normalizeCheckMainRootClone = root.getLastChild();
      new PrepareAst(compiler).process(
          normalizeCheckExternsRootClone, normalizeCheckMainRootClone);
      String explanation =
          normalizeCheckMainRootClone.checkTreeEquals(mainRoot);
      assertNull("Node structure normalization invalidated.\nExpected: " +
          compiler.toSource(normalizeCheckMainRootClone) +
          "\nResult: " + compiler.toSource(mainRoot) +
          "\n" + explanation, explanation);

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      // (FoldConstants, etc) runs before the Normalize pass, so this can't be
      // force on everywhere.
      if (normalizeEnabled) {
        new Normalize(compiler, true).process(
            normalizeCheckExternsRootClone, normalizeCheckMainRootClone);
        explanation =  normalizeCheckMainRootClone.checkTreeEquals(mainRoot);
        assertNull("Normalization invalidated.\nExpected: " +
            compiler.toSource(normalizeCheckMainRootClone) +
            "\nResult: " + compiler.toSource(mainRoot) +
            "\n" + explanation, explanation);
      }

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    Node root = compiler.getRoot().getLastChild();
    if (useStringComparison) {
      assertEquals(Joiner.on("").join(compiled), compiler.toSource());
    } else {
      Node expectedRoot = parse(compiled);
      String explanation = expectedRoot.checkTreeEquals(root);
      assertNull("\nExpected: " + compiler.toSource(expectedRoot) +
          "\nResult: " + compiler.toSource(root) +
          "\n" + explanation, explanation);
    }
  }

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      String js) {
    Compiler compiler = new Compiler();
    JsonMLAst ast = new JsonMLAst(jsonmlRoot);
    Node resultAstRoot = ast.getAstRoot(compiler);


    String explanation = resultAstRoot.checkTreeEquals(astRoot);
    assertNull("JsonML -> AST converter returned incorect result for " + js
       + "\n" + explanation, explanation);
  }


  private void testAstToJsonMLConverstion(Node astRoot, JsonML jsonmlRoot,

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