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1 package test.net.sourceforge.pmd.rules.design; 2 3 import net.sourceforge.pmd.PMD; 4 import net.sourceforge.pmd.rules.design.NullAssignmentRule; 5 import test.net.sourceforge.pmd.rules.RuleTst; 6 7 public class NullAssignmentRuleTest extends RuleTst { 8 9 private static final String TEST1 = 10 "public class NullAssignment1 {" + PMD.EOL + 11 " public Object foo() {" + PMD.EOL + 12 " Object x = null; // OK" + PMD.EOL + 13 " return x;" + PMD.EOL + 14 " } " + PMD.EOL + 15 "}"; 16 17 private static final String TEST2 = 18 "public class NullAssignment2 {" + PMD.EOL + 19 " public void foo() {" + PMD.EOL + 20 " Object x;" + PMD.EOL + 21 " x = new Object();" + PMD.EOL + 22 " for (int y = 0; y < 10; y++) {" + PMD.EOL + 23 " System.err.println(y); " + PMD.EOL + 24 " }" + PMD.EOL + 25 " x = null; // This is bad" + PMD.EOL + 26 " }" + PMD.EOL + 27 "}"; 28 29 private static final String TEST3 = 30 "public class NullAssignment3 {" + PMD.EOL + 31 " public void foo() {" + PMD.EOL + 32 " Object x;" + PMD.EOL + 33 " if (x == null) { // This is OK" + PMD.EOL + 34 " return;" + PMD.EOL + 35 " }" + PMD.EOL + 36 " }" + PMD.EOL + 37 "}"; 38 39 private static final String TEST4 = 40 "public class NullAssignment4 {" + PMD.EOL + 41 " public void foo() {" + PMD.EOL + 42 " String x = null;" + PMD.EOL + 43 " x = new String(null);" + PMD.EOL + 44 " }" + PMD.EOL + 45 "}"; 46 47 public void testInitAssignment() throws Throwable { 48 runTestFromString(TEST1, 0, new NullAssignmentRule()); 49 } 50 51 public void testBadAssignment() throws Throwable { 52 runTestFromString(TEST2, 1, new NullAssignmentRule()); 53 } 54 55 public void testCheckTest() throws Throwable { 56 runTestFromString(TEST3, 0, new NullAssignmentRule()); 57 } 58 59 public void testNullParamOnRHS() throws Throwable { 60 runTestFromString(TEST4, 0, new NullAssignmentRule()); 61 } 62 }

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