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pmd-documentation/UseAssertNullInsteadOfAssertTrue.md

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+
+# UseAssertNullInsteadOfAssertTrue
+
+*Usage:* 
+`pmd check -d <source code folder> -R category/java/bestpractices.xml/UseAssertNullInsteadOfAssertTrue -format <output format>`
+
+*Description:*
+
+This rule detects JUnit assertions in object references equality. These assertions should be made by
+more specific methods, like assertNull, assertNotNull.
+        
+
+*Example:*
+```java
+
+
+public class FooTest extends TestCase {
+    void testCode() {
+        Object a = doSomething();
+        assertTrue(a==null);    // bad usage
+        assertNull(a);          // good usage
+        assertTrue(a != null);  // bad usage
+        assertNotNull(a);       // good usage
+    }
+}
+
+        
+```