diff --git a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/internal/core/externaltool/ExternalToolInvokerTest.java b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/internal/core/externaltool/ExternalToolInvokerTest.java
index fafa8041ff9..3058bca6c01 100644
--- a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/internal/core/externaltool/ExternalToolInvokerTest.java
+++ b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/internal/core/externaltool/ExternalToolInvokerTest.java
@@ -16,14 +16,16 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.eclipse.cdt.codan.core.externaltool.AbstractOutputParser;
 import org.eclipse.cdt.codan.core.externaltool.ConfigurationSettings;
 import org.eclipse.cdt.codan.core.externaltool.IArgsSeparator;
 import org.eclipse.cdt.codan.core.externaltool.ICommandLauncher;
-import org.eclipse.cdt.codan.core.externaltool.AbstractOutputParser;
 import org.eclipse.cdt.codan.core.externaltool.InvocationFailure;
 import org.eclipse.cdt.codan.core.externaltool.InvocationParameters;
+import org.eclipse.cdt.codan.core.externaltool.SingleConfigurationSetting;
 import org.eclipse.cdt.codan.core.externaltool.SpaceDelimitedArgsSeparator;
 import org.eclipse.cdt.codan.core.param.BasicProblemPreference;
+import org.eclipse.cdt.codan.core.param.IProblemPreference;
 import org.eclipse.cdt.codan.core.param.MapProblemPreference;
 import org.eclipse.cdt.codan.core.test.CodanTestCase;
 import org.eclipse.core.resources.IProject;
@@ -67,16 +69,19 @@ public class ExternalToolInvokerTest extends CodanTestCase {
 	private MapProblemPreference createPreferences(File path, String args,
 			boolean shouldDisplayOutput) {
 		MapProblemPreference preferences = new MapProblemPreference();
-		preferences.addChildDescriptor(new BasicProblemPreference("externalToolPath", "Path"));
-		preferences.addChildDescriptor(new BasicProblemPreference("externalToolArgs", "Args"));
-		preferences.addChildDescriptor(new BasicProblemPreference("externalToolShouldDisplayOutput",
-				"Should Display Output"));
-		preferences.setChildValue("externalToolPath", path);
-		preferences.setChildValue("externalToolArgs", args);
-		preferences.setChildValue("externalToolShouldDisplayOutput", shouldDisplayOutput);
+		preferences.addChildDescriptor(createPreference(PathSetting.KEY, path));
+		preferences.addChildDescriptor(createPreference(ArgsSetting.KEY, args));
+		preferences.addChildDescriptor(createPreference(ShouldDisplayOutputSetting.KEY,
+				shouldDisplayOutput));
 		return preferences;
 	}
 
+	private IProblemPreference createPreference(String key, Object value) {
+		BasicProblemPreference preference = new BasicProblemPreference(key, "");
+		preference.setValue(value);
+		return preference;
+	}
+
 	@Override
 	public boolean isCpp() {
 		return true;
@@ -89,26 +94,24 @@ public class ExternalToolInvokerTest extends CodanTestCase {
 		InvocationParameters parameters = new InvocationParameters(currentIFile, currentIFile,
 				currentIFile.getLocation().toOSString(), cproject.getProject().getLocation());
 		externalToolInvoker.invoke(parameters, configurationSettings, argsSeparator, parsers);
-		assertSame(cproject.getProject(), commandLauncher.project);
-		assertEquals(EXTERNAL_TOOL_NAME, commandLauncher.externalToolName);
-		String expectedExecutablePath = configurationSettings.getPath().getValue().toString();
-		assertEquals(expectedExecutablePath, commandLauncher.executablePath.toOSString());
-		String[] expectedArgs = { parameters.getActualFilePath(), "--debug=true", "--include=all" };
-		assertArrayEquals(expectedArgs, commandLauncher.args);
-		assertEquals(parameters.getWorkingDirectory(), commandLauncher.workingDirectory);
-		assertEquals(configurationSettings.getShouldDisplayOutput().getValue().booleanValue(),
-				commandLauncher.shouldDisplayOutput);
-		assertSame(parsers, commandLauncher.parsers);
+		commandLauncher.assertThatReceivedProject(cproject.getProject());
+		commandLauncher.assertThatReceivedExternalToolName(EXTERNAL_TOOL_NAME);
+		commandLauncher.assertThatReceivedExecutablePath(configurationSettings.getPath());
+		commandLauncher.assertThatReceivedArgs(configurationSettings.getArgs());
+		commandLauncher.assertThatReceivedWorkingDirectory(parameters.getWorkingDirectory());
+		commandLauncher.assertThatReceivedShouldDisplayOutput(
+				configurationSettings.getShouldDisplayOutput());
+		commandLauncher.assetThatReceivedOutputParsers(parsers);
 	}
 
 	private static class CommandLauncherStub implements ICommandLauncher {
-		IProject project;
-		String externalToolName;
-		IPath executablePath;
-		String[] args;
-		IPath workingDirectory;
-		boolean shouldDisplayOutput;
-		List<AbstractOutputParser> parsers;
+		private IProject project;
+		private String externalToolName;
+		private IPath executablePath;
+		private String[] args;
+		private IPath workingDirectory;
+		private boolean shouldDisplayOutput;
+		private List<AbstractOutputParser> parsers;
 
 		@Override
 		public void buildAndLaunchCommand(IProject project, String externalToolName,
@@ -123,5 +126,35 @@ public class ExternalToolInvokerTest extends CodanTestCase {
 			this.shouldDisplayOutput = shouldDisplayOutput;
 			this.parsers = parsers;
 		}
+
+		void assertThatReceivedProject(IProject expected) {
+			assertEquals(expected, project);
+		}
+
+		void assertThatReceivedExternalToolName(String expected) {
+			assertEquals(expected, externalToolName);
+		}
+
+		void assertThatReceivedExecutablePath(SingleConfigurationSetting<File> expected) {
+			String expectedPath = expected.getValue().toString();
+			assertEquals(expectedPath, executablePath.toOSString());
+		}
+
+		void assertThatReceivedArgs(SingleConfigurationSetting<String> expected) {
+			String[] expectedArgs = expected.getValue().split("\\s+");
+			assertArrayEquals(expectedArgs, args);
+		}
+
+		void assertThatReceivedWorkingDirectory(IPath expected) {
+			assertSame(expected, workingDirectory);
+		}
+
+		void assertThatReceivedShouldDisplayOutput(SingleConfigurationSetting<Boolean> expected) {
+			assertEquals(expected.getValue().booleanValue(), shouldDisplayOutput);
+		}
+
+		void assetThatReceivedOutputParsers(List<AbstractOutputParser> expected) {
+			assertSame(expected, parsers);
+		}
 	}
 }
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ArgsSetting.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ArgsSetting.java
index 37d8a748d5e..61f0f9a4e47 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ArgsSetting.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ArgsSetting.java
@@ -26,7 +26,7 @@ import org.eclipse.cdt.codan.core.param.IProblemPreferenceDescriptor;
  * @since 2.1
  */
 public class ArgsSetting extends SingleConfigurationSetting<String> {
-	private static final String KEY = "externalToolArgs"; //$NON-NLS-1$
+	static final String KEY = "externalToolArgs"; //$NON-NLS-1$
 
 	/**
 	 * Constructor.
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/PathSetting.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/PathSetting.java
index 378fab61be6..91864b1d147 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/PathSetting.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/PathSetting.java
@@ -27,7 +27,7 @@ import org.eclipse.cdt.codan.core.param.IProblemPreferenceDescriptor;
  * @since 2.1
  */
 public class PathSetting extends SingleConfigurationSetting<File> {
-	private static final String KEY = "externalToolPath"; //$NON-NLS-1$
+	static final String KEY = "externalToolPath"; //$NON-NLS-1$
 
 	/**
 	 * Constructor.
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ShouldDisplayOutputSetting.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ShouldDisplayOutputSetting.java
index e3aaf704219..77c3ce5a95d 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ShouldDisplayOutputSetting.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/internal/core/externaltool/ShouldDisplayOutputSetting.java
@@ -26,7 +26,7 @@ import org.eclipse.cdt.codan.core.param.IProblemPreferenceDescriptor;
  * @since 2.1
  */
 public class ShouldDisplayOutputSetting extends SingleConfigurationSetting<Boolean> {
-	private static final String KEY = "externalToolShouldDisplayOutput"; //$NON-NLS-1$
+	static final String KEY = "externalToolShouldDisplayOutput"; //$NON-NLS-1$
 
 	/**
 	 * Constructor.