    1   package test.net.sourceforge.pmd.rules;
    2
    3   import net.sourceforge.pmd.PMD;
    4   import net.sourceforge.pmd.Rule;
    5   import net.sourceforge.pmd.RuleSetNotFoundException;
    6   import test.net.sourceforge.pmd.testframework.SimpleAggregatorTst;
    7   import test.net.sourceforge.pmd.testframework.TestDescriptor;
    8
    9   public class EqualsNullRuleTest extends SimpleAggregatorTst {
    10
    11      private Rule rule;
    12
    13      public void setUp() throws RuleSetNotFoundException {
    14          rule = findRule("design", "EqualsNull");
    15      }
    16
    17      public void testAll() {
    18          runTests(new TestDescriptor[]{
    19              new TestDescriptor(TEST1, "object.equals(null), bad", 1, rule),
    20              new TestDescriptor(TEST2, "object == null, ok", 0, rule),
    21              new TestDescriptor(TEST3, "object.method().equals(null), bad", 1, rule),
    22          });
    23      }
    24
    25      private static final String TEST1 =
    26              "public class Foo {" + PMD.EOL +
    27              " void bar() {" + PMD.EOL +
    28              "  if (foo.equals(null)) {}" + PMD.EOL +
    29              " }" + PMD.EOL +
    30              "}";
    31
    32      private static final String TEST2 =
    33              "public class Foo {" + PMD.EOL +
    34              " void bar() {" + PMD.EOL +
    35              "  if (foo == null) {}" + PMD.EOL +
    36              " }" + PMD.EOL +
    37              "}";
    38
    39      private static final String TEST3 =
    40              "public class Foo {" + PMD.EOL +
    41              " void bar() {" + PMD.EOL +
    42              "  if (foo.bar().equals(null)) {}" + PMD.EOL +
    43              " }" + PMD.EOL +
    44              "}";
    45
    46  }