Add failing tests for unresolvable properties

This relates to #1916

Author: kwin

org.eclipse.m2e.jdt.tests/src/org/eclipse/m2e/jdt/tests/UnitTestLaunchConfigConfigurationTest.java

@@ -150,7 +150,7 @@ public void test_configuration_must_be_updated_with_surefire_config()
 
 		// check argLine
 		String argLine = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_VM_ARGUMENTS, "");
-		assertTrue(argLine.contains("--argLineItem=surefireArgLineValue"));
+		assertEquals("--argLineItem=surefireArgLineValue --undefinedArgLineItem=", argLine.trim());
 
 		// check environmentVariables
 		Map<String, String> envVars = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_ENVIRONMENT_VARIABLES,
@@ -209,7 +209,7 @@ public void test_configuration_must_be_updated_with_failsafe_config()
 
 		// check argLine
 		String argLine = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_VM_ARGUMENTS, "");
-		assertTrue(argLine.contains("--argLineItem=failsafeArgLineValue"));
+		assertEquals("--argLineItem=failsafeArgLineValue --undefinedArgLineItem=", argLine.trim());
 
 		// check environmentVariables
 		Map<String, String> envVars = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_ENVIRONMENT_VARIABLES,
@@ -261,7 +261,7 @@ public void test_configuration_must_be_updated_with_surefire_config_when_created
 
 		// check argLine
 		String argLine = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_VM_ARGUMENTS, "");
-		assertTrue(argLine.contains("--argLineItem=surefireArgLineValue"));
+		assertEquals("--argLineItem=surefireArgLineValue --undefinedArgLineItem=", argLine.trim());
 
 		// check environmentVariables
 		Map<String, String> envVars = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_ENVIRONMENT_VARIABLES,
@@ -310,7 +310,7 @@ public void test_configuration_must_be_updated_with_failSafe_config_when_created
 
 		// check argLine
 		String argLine = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_VM_ARGUMENTS, "");
-		assertTrue(argLine.contains("--argLineItem=failsafeArgLineValue"));
+		assertEquals("--argLineItem=failsafeArgLineValue --undefinedArgLineItem=", argLine.trim());
 
 		// check environmentVariables
 		Map<String, String> envVars = config.getAttribute(UnitTestSupport.LAUNCH_CONFIG_ENVIRONMENT_VARIABLES,