TestHashCodeEquals.java

/*
 * Copyright (C) 2007 Júlio Vilmar Gesser.
 * 
 * This file is part of Java 1.5 parser and Abstract Syntax Tree.
 *
 * Java 1.5 parser and Abstract Syntax Tree is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Java 1.5 parser and Abstract Syntax Tree is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Java 1.5 parser and Abstract Syntax Tree.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * Created on 22/11/2006
 */
package org.checkerframework.stubparser.ast.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import org.checkerframework.stubparser.ast.CompilationUnit;
import org.checkerframework.stubparser.ast.PackageDeclaration;
import org.checkerframework.stubparser.ast.expr.NameExpr;
import org.checkerframework.stubparser.ast.test.classes.DumperTestClass;
import org.checkerframework.stubparser.ast.test.classes.JavadocTestClass;

import org.junit.Test;

/**
 * @author Julio Vilmar Gesser
 */
public class TestHashCodeEquals {

    private void assertEqualsAndHashCode(Object o1, Object o2) {
        assertEquals(o1, o2);
        assertEquals(o1.hashCode(), o2.hashCode());
    }

    private void assertNotEqualsAndHashCode(Object o1, Object o2) {
        assertFalse("Not different equals", o1.equals(o2));
        assertFalse("Not different hashCode", o1.hashCode() == o2.hashCode());
    }

    private void assertNotEquals(Object o1, Object o2) {
        assertFalse("Not different equals", o1.equals(o2));
    }

    @Test
    public void tesCompilationUnitEqual() throws Exception {
        String source = Helper.readClass("./test", DumperTestClass.class);
        CompilationUnit cu1 = Helper.parserString(source);
        CompilationUnit cu2 = Helper.parserString(source);
        assertEqualsAndHashCode(cu1, cu2);
    }

    @Test
    public void tesCompilationUnitNotEqual() throws Exception {
        String source = Helper.readClass("./test", DumperTestClass.class);
        CompilationUnit cu1 = Helper.parserString(source);
        CompilationUnit cu2 = Helper.parserString(source);

        cu2.setPackage(new PackageDeclaration(new NameExpr("diff_package")));
        assertNotEqualsAndHashCode(cu1, cu2);
    }

    @Test
    public void testDiffClasses() throws Exception {
        final String source_with_comment = //
        "package org.checkerframework.stubparser.javacc; " + //
                "public class Teste {}";
        final String source_without_comment = //
        "package org.checkerframework.stubparser.javacc; " + //
                "public enum Teste {}";

        CompilationUnit cu1 = Helper.parserString(source_with_comment);
        CompilationUnit cu2 = Helper.parserString(source_without_comment);

        assertNotEqualsAndHashCode(cu1, cu2);
    }

    @Test
    public void testJavadoc() throws Exception {
        String source = Helper.readClass("./test", JavadocTestClass.class);
        CompilationUnit cu1 = Helper.parserString(source);
        CompilationUnit cu2 = Helper.parserString(source);
        assertEqualsAndHashCode(cu1, cu2);
    }

    private final String source_with_comment = //
    "package org.checkerframework.stubparser.javacc;\n" + //
            "public class Teste {\n" + //
            "// line comment\n" + //
            "int a = 0;" + //
            "// line comment\r\n" + //
            "int b = 0;" + //
            "// line comment\r" + //
            "int c = 0;" + //
            "/* multi-line\n comment\n*/" + //
            "int d = 0;" + //
            "/** multi-line\r\n javadoc\n*/" + //
            "int e = 0;" + //
            "}\n" + //
            "// final comment" + //
            "";

    private final String source_without_comment = //
    "package org.checkerframework.stubparser.javacc;\n" + //
            "\n" + //
            "public class Teste {\n" + //
            "\n" + //
            "    int a = 0;\n" + //
            "\n" + //
            "    int b = 0;\n" + //
            "\n" + //
            "    int c = 0;\n" + //
            "\n" + //
            "    int d = 0;\n" + //
            "\n" + //
            "    /** multi-line\r\n javadoc\n*/\n" + //
            "    int e = 0;\n" + //
            "}\n" + //
            "";

    @Test
    public void testCommentsDiff() throws Exception {

        CompilationUnit cu1 = Helper.parserString(source_with_comment);
        CompilationUnit cu2 = Helper.parserString(source_without_comment);

        // hashcode can be the same, equals() shall return false
        assertNotEquals(cu1, cu2);
    }

    @Test
    public void testCommentsEquals() throws Exception {

        CompilationUnit cu1 = Helper.parserString(source_with_comment);
        CompilationUnit cu2 = Helper.parserString(source_with_comment);

        assertEqualsAndHashCode(cu1, cu2);
    }
}