[javascript] Add a treedump test

pmd-javascript/src/test/java/net/sourceforge/pmd/lang/ecmascript/ast/JsTreeDumpTest.java

@@ -0,0 +1,33 @@
+/*
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+
+package net.sourceforge.pmd.lang.ecmascript.ast;
+
+import org.junit.Test;
+
+import net.sourceforge.pmd.lang.ast.test.BaseParsingHelper;
+import net.sourceforge.pmd.lang.ast.test.BaseTreeDumpTest;
+import net.sourceforge.pmd.lang.ast.test.NodePrintersKt;
+
+public class JsTreeDumpTest extends BaseTreeDumpTest {
+    public JsTreeDumpTest() {
+        super(NodePrintersKt.getSimpleNodePrinter(), ".js");
+    }
+
+    @Override
+    public BaseParsingHelper<JsParsingHelper, ASTAstRoot> getParser() {
+        return JsParsingHelper.DEFAULT.withResourceContext(JsTreeDumpTest.class, "testdata");
+    }
+
+    @Test
+    public void simpleJavascriptFile() {
+        doTest("SimpleJavascriptFile");
+    }
+
+    @Test
+    public void jquerySelector() {
+        doTest("jquery-selector");
+    }
+}

pmd-javascript/src/test/resources/net/sourceforge/pmd/lang/ecmascript/ast/testdata/SimpleJavascriptFile.js

@@ -0,0 +1,6 @@
+var x = 1;
+let z = 0;
+function foo() {
+  var y = x + 1;
+  return y;
+}

pmd-javascript/src/test/resources/net/sourceforge/pmd/lang/ecmascript/ast/testdata/SimpleJavascriptFile.txt

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++- AstRoot
+   +- VariableDeclaration
+   |  +- VariableInitializer
+   |     +- Name
+   |     +- NumberLiteral
+   +- VariableDeclaration
+   |  +- VariableInitializer
+   |     +- Name
+   |     +- NumberLiteral
+   +- FunctionNode
+      +- Name
+      +- Block
+         +- VariableDeclaration
+         |  +- VariableInitializer
+         |     +- Name
+         |     +- InfixExpression
+         |        +- Name
+         |        +- NumberLiteral
+         +- ReturnStatement
+            +- Name