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J2clEqualitySameRewriterPassTest.java
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J2clEqualitySameRewriterPassTest.java
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/*
* Copyright 2016 The Closure Compiler Authors.
*
* 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 com.google.javascript.jscomp;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class J2clEqualitySameRewriterPassTest extends CompilerTestCase {
private static final String EXTERN = "Equality.$same = function(opt_a, opt_b) {};";
private static boolean useTypes;
public J2clEqualitySameRewriterPassTest() {
super(MINIMAL_EXTERNS + EXTERN);
}
@Override
@Before
public void setUp() throws Exception {
super.setUp();
useTypes = false;
enableTypeCheck();
}
@Override
protected CompilerPass getProcessor(final Compiler compiler) {
return new PeepholeOptimizationsPass(
compiler, getName(), new J2clEqualitySameRewriterPass(useTypes));
}
@Override
protected Compiler createCompiler() {
Compiler compiler = super.createCompiler();
J2clSourceFileChecker.markToRunJ2clPasses(compiler);
return compiler;
}
@Test
public void testRewriteEqualitySame() {
test(
lines(
"Equality.$same(0, '');",
"var a = 'ABC';",
"Equality.$same(a, 'ABC');",
"var b = {}",
"Equality.$same(b, 5);",
"Equality.$same(b, []);",
"Equality.$same(b, null);",
"Equality.$same(null, b);"),
lines(
"0 === '';",
"var a = 'ABC';",
"a === 'ABC';",
"var b = {};",
"b === 5;",
"b === [];",
"b == null;",
"b == null;"));
}
@Test
public void testRewriteEqualitySame_useTypes() {
useTypes = true;
test(
lines(
"var b = {};",
"Equality.$same(b, null);",
"Equality.$same(null, b);",
"Equality.$same(b, undefined);",
"var c = 5;",
"Equality.$same(c, null);",
"Equality.$same(null, c);",
"Equality.$same(c, undefined);"),
lines(
"var b = {};",
"!b",
"!b;",
"!b;",
"var c = 5;",
"c == null;", // Note that the semantics are preserved for number.
"c == null;",
"c == undefined;"));
}
@Test
public void testNotRewriteEqualitySame() {
testSame(
lines(
"Equality.$same(c, d);",
"/** @type {number} */",
"var num = 5",
"/** @type {string} */",
"var str = 'ABC';",
"/** @type {*} */",
"var allType = null;",
"Equality.$same(num, str);",
"Equality.$same(num, allType);",
"Equality.$same(str, allType);",
"function hasSideEffects(){};",
// Note that the first parameter has value 'undefined' but it has side effects.
"Equality.$same(void hasSideEffects(), hasSideEffects());",
"Equality.$same(void hasSideEffects(), {a: hasSideEffects()});"));
}
@Test
public void testNotRewriteEqualitySame_useTypes() {
useTypes = true;
testSame(
lines(
"/** @type {number|undefined} */",
"var num1 = 5;",
"/** @type {?number} */",
"var num2 = 5;",
"Equality.$same(num1, num2);",
"/** @type {string} */",
"var str1 = '';",
"/** @type {string|undefined} */",
"var str2 = 'abc';",
"Equality.$same(str1, str2);",
"/** @type {!Object} */",
"var obj1 = {};",
"/** @type {Object} */",
"var obj2 = null;",
"Equality.$same(obj1, obj2);",
"Equality.$same(obj1, str2);",
"Equality.$same(obj1, num2);",
"/** @type {*} */",
"var allType1 = 1;",
"/** @type {*} */",
"var allType2 = '1';",
"Equality.$same(allType1, allType2);"));
}
@Test
public void testNotRewriteEqualitySame_parametersOptimizedAway() {
testSame(
lines(
"Equality.$same(null);",
"Equality.$same();"));
}
}