refactored client constructor to support class dependancy injection

build.gradle

@@ -35,7 +35,9 @@ dependencies {
     implementation 'com.google.guava:guava:27.0.1-jre'
 
     // Use JUnit test framework
-    testImplementation 'junit:junit:4.12'
+    testImplementation "io.grpc:grpc-testing:${grpcVersion}"
+    testImplementation "junit:junit:4.12"
+    testImplementation "org.mockito:mockito-core:2.25.1"
 
     // Used by GRPC generated code
     compile 'org.glassfish:javax.annotation:10.0-b28'

src/main/java/JobServ/JobServClient.java

@@ -48,23 +48,10 @@ public class JobServClient {
 
     /*
      * Constructor
-     * Creates an SslContext from cert, key, and trust store
-     * Creates a ManagedChannel object from SSL Parameters
      * Spawns a new blockingStub for network operations with the server
      */
-    public JobServClient(String host,
+    public JobServClient(ManagedChannel channel) {
-                         int port,
+	this.channel = channel;
-                         String trustStore,
-                         String clientCert,
-                         String clientPrivateKey) throws SSLException {
-        SslContextBuilder builder = GrpcSslContexts.forClient();
-        builder.trustManager(new File(trustStore));
-        builder.keyManager(new File(clientCert), new File(clientPrivateKey));
-
-        this.channel = NettyChannelBuilder.forAddress(host, port)
-            .sslContext(builder.build())
-            .build();
-
         blockingStub = ShellServerGrpc.newBlockingStub(this.channel);
     }
 
@@ -210,7 +197,7 @@ public class JobServClient {
     /*
      * main()
      * Client entrypoint
-     * Parses arguments and calls the correct function
+     * Parses arguments, initializes client, and calls the correct functions
      */
     public static void main(String[] args) throws Exception {
 
@@ -224,7 +211,15 @@ public class JobServClient {
 
         JobServClient client;
         try {
-            client = new JobServClient(args[3], Integer.parseInt(args[4]), args[2], args[1], args[0]);
+	    SslContextBuilder builder = GrpcSslContexts.forClient();
+	    builder.trustManager(new File(args[2]));
+	    builder.keyManager(new File(args[1]), new File(args[0]));
+
+	    ManagedChannel channel = NettyChannelBuilder.forAddress(args[3], Integer.parseInt(args[4]))
+		.sslContext(builder.build())
+		.build();
+	    
+            client = new JobServClient(channel);
 
         // Likely bad port
         } catch (NumberFormatException e) {

src/test/java/JobServ/JobServerAuthenticationTest.java

@@ -8,6 +8,9 @@
 
 package JobServ;
 
+import java.io.File;
+import javax.net.ssl.SSLException;
+
 import static org.junit.Assert.assertEquals;
 import static org.mockito.AdditionalAnswers.delegatesTo;
 import static org.mockito.Mockito.mock;
@@ -41,7 +44,7 @@ import org.mockito.ArgumentMatchers;
  */
 
 @RunWith(JUnit4.class)
-public class JobServerAuthorizationTest {
+public class JobServerAuthenticationTest {
 
     // Authorized client key/cert/ca
     private final String clientCa = "resources/client/ca.crt";
@@ -60,9 +63,9 @@ public class JobServerAuthorizationTest {
 
     // Automates (graceful) shutdown at end of tests
     @Rule
-    public final GrpcCleanupRule grpcCleanup = newCleanupRule();
+    public final GrpcCleanupRule grpcCleanup = new GrpcCleanupRule();
 
-    private final ShellServerGrpc.ShellServerImplBase = mock(ShellServerGrpc.ShellServerImplBase.class,
+    private final ShellServerGrpc.ShellServerImplBase serviceImpl= mock(ShellServerGrpc.ShellServerImplBase.class,
 					     delegatesTo(new ShellServerGrpc.ShellServerImplBase() {}));
 
     // badClient uses unauthorized certs
@@ -91,7 +94,7 @@ public class JobServerAuthorizationTest {
 	grpcCleanup.register(InProcessServerBuilder.forName(serverName)
 			     .sslContext(serverContextBuilder.build())
 			     .directExecutor()
-			     .addService(this.serviceImpl);
+			     .addService(this.serviceImpl)
 			     .build().start()); 
 	
 	this.serverSslInitialized = true;
@@ -177,6 +180,7 @@ public class JobServerAuthorizationTest {
     public void certAuthPosTest() {
 	assertEquals(clientSslInitialized, true);
 	int result = goodClient.sendNewJobMessage("test command");
-	assertNotEquals(result, -2);
+	Boolean assertCondition = result == -2;
+	assertEquals(result, false);
     }
 }