JS backend: increment counter for fresh names

js/js.tests/test/org/jetbrains/k2js/test/ast/JsScopeTest.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.k2js.test.ast;
+
+import com.google.dart.compiler.backend.js.ast.JsName;
+import com.google.dart.compiler.backend.js.ast.JsScope;
+import junit.framework.TestCase;
+import org.jetbrains.annotations.NotNull;
+
+public final class JsScopeTest extends TestCase {
+    private JsScope scope;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        scope = new JsScope("Test scope") {};
+    }
+
+    public void testDeclareFreshName() throws Exception {
+        declareFreshNameAndAssertEquals("a", "a");
+        declareFreshNameAndAssertEquals("a", "a_0");
+        declareFreshNameAndAssertEquals("a", "a_1");
+
+        declareFreshNameAndAssertEquals("a_1", "a_2");
+        declareFreshNameAndAssertEquals("a_3", "a_3");
+
+        declareFreshNameAndAssertEquals("a_1_1", "a_1_1");
+        declareFreshNameAndAssertEquals("a_1_1", "a_1_2");
+
+        declareFreshNameAndAssertEquals("tmp$0", "tmp$0");
+        declareFreshNameAndAssertEquals("tmp$0", "tmp$1");
+
+        declareFreshNameAndAssertEquals("a0", "a0");
+        declareFreshNameAndAssertEquals("a0", "a0_0");
+        declareFreshNameAndAssertEquals("a0_0", "a0_1");
+    }
+
+    private void declareFreshNameAndAssertEquals(@NotNull String suggested, @NotNull String expected) {
+        JsName actual = scope.declareFreshName(suggested);
+        assertEquals(expected, actual.getIdent());
+    }
+}