fix unit tests

pom.xml

@@ -268,7 +268,7 @@
       <plugin>
         <groupId>com.github.spotbugs</groupId>
         <artifactId>spotbugs-maven-plugin</artifactId>
-        <version>4.7.3.5</version>
+        <version>4.7.3.6</version>
         <configuration>
           <excludeFilterFile>spotbugs-exclude.xml</excludeFilterFile>
         </configuration>

src/main/java/com/google/cloud/tools/maven/cloudsdk/CloudSdkAppEngineFactory.java

@@ -53,7 +53,7 @@ public class CloudSdkAppEngineFactory {
   private final CloudSdkMojo mojo;
 
   public CloudSdkAppEngineFactory(CloudSdkMojo mojo) {
-    this.mojo = mojo;
+    this.mojo = mojo.clone();
   }
 
   /** Constructs an object used for auth. */

src/main/java/com/google/cloud/tools/maven/cloudsdk/CloudSdkMojo.java

@@ -28,7 +28,7 @@
 import org.codehaus.plexus.util.xml.Xpp3Dom;
 
 /** Abstract Mojo from which all goals inherit. */
-public abstract class CloudSdkMojo extends AbstractMojo {
+public abstract class CloudSdkMojo extends AbstractMojo implements Cloneable {
 
   /** Optional parameter to configure the location of the Google Cloud SDK. */
   @Parameter(property = "cloudSdkHome", required = false)
@@ -126,12 +126,35 @@ public MavenProject getMavenProject() {
   }
 
   public MavenSession getMavenSession() {
-    return mavenSession;
+    return mavenSession.clone();
   }
 
   @VisibleForTesting
   /* For use with tests only. */
   public void setSkip(boolean skip) {
     this.skip = skip;
   }
+
+  @Override
+  public CloudSdkMojo clone() {
+    CloudSdkMojo clone;
+    try {
+      clone = (CloudSdkMojo) super.clone();
+    } catch (CloneNotSupportedException e) {
+      throw new AssertionError();
+    }
+
+    clone.deepCopy(this);
+    return clone;
+  }
+
+  private void deepCopy(CloudSdkMojo mojo) {
+    this.cloudSdkHome = mojo.cloudSdkHome;
+    this.cloudSdkVersion = mojo.cloudSdkVersion;
+    this.serviceAccountKeyFile = mojo.serviceAccountKeyFile;
+    this.verbosity = mojo.verbosity;
+    this.pluginDescriptor = mojo.pluginDescriptor;
+    this.mavenProject = mojo.mavenProject;
+    this.mavenSession = mojo.mavenSession;
+  }
 }

src/test/java/com/google/cloud/tools/maven/cloudsdk/CloudSdkAppEngineFactoryTest.java

@@ -36,7 +36,6 @@
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.junit.MockitoJUnitRunner;
@@ -56,11 +55,11 @@ public class CloudSdkAppEngineFactoryTest {
 
   @Mock private CloudSdkDownloader cloudSdkDownloader;
   @Mock private CloudSdkChecker cloudSdkChecker;
-
-  @InjectMocks private CloudSdkAppEngineFactory factory;
+  private CloudSdkAppEngineFactory factory;
 
   @Before
   public void wireUp() {
+    when(mojoMock.clone()).thenReturn(mojoMock);
     when(mojoMock.getCloudSdkHome()).thenReturn(CLOUD_SDK_HOME);
     when(mojoMock.getCloudSdkVersion()).thenReturn(null);
     when(mojoMock.getArtifactId()).thenReturn(ARTIFACT_ID);
@@ -83,6 +82,7 @@ public void wireUp() {
             Mockito.eq(logMock),
             Mockito.<SdkComponent>anyList(),
             Mockito.anyBoolean());
+    factory = new CloudSdkAppEngineFactory(mojoMock);
   }
 
   @Test