package test.net.sourceforge.pmd.rules;

import net.sourceforge.pmd.PMD;
import net.sourceforge.pmd.Rule;
import net.sourceforge.pmd.RuleSetNotFoundException;
import test.net.sourceforge.pmd.testframework.SimpleAggregatorTst;
import test.net.sourceforge.pmd.testframework.TestDescriptor;

public class EqualsNullRuleTest extends SimpleAggregatorTst {

    private Rule rule;

    public void setUp() throws RuleSetNotFoundException {
        rule = findRule("design", "EqualsNull");
    }

    public void testAll() {
        runTests(new TestDescriptor[]{
            new TestDescriptor(TEST1, "object.equals(null), bad", 1, rule),
            new TestDescriptor(TEST2, "object == null, ok", 0, rule),
            new TestDescriptor(TEST3, "object.method().equals(null), bad", 1, rule),
            new TestDescriptor(TEST4, "object.equals(null, other), ok", 0, rule),
        });
    }

    private static final String TEST1 =
            "public class Foo {" + PMD.EOL +
            " void bar() {" + PMD.EOL +
            "  if (foo.equals(null)) {}" + PMD.EOL +
            " }" + PMD.EOL +
            "}";

    private static final String TEST2 =
            "public class Foo {" + PMD.EOL +
            " void bar() {" + PMD.EOL +
            "  if (foo == null) {}" + PMD.EOL +
            " }" + PMD.EOL +
            "}";

    private static final String TEST3 =
            "public class Foo {" + PMD.EOL +
            " void bar() {" + PMD.EOL +
            "  if (foo.bar().equals(null)) {}" + PMD.EOL +
            " }" + PMD.EOL +
            "}";

    private static final String TEST4 =
            "public class Foo {" + PMD.EOL +
            " void bar() {" + PMD.EOL +
            "  if (foo.equals(null, other)) {}" + PMD.EOL +
            " }" + PMD.EOL +
            "}";

}
