Add unit test for the new code in paste.

Author: Aleksi Salmela

src/main/java/fi/helsinki/cs/tmc/cli/command/PasteCommand.java

@@ -49,7 +49,7 @@ public void run(CliContext context, CommandLine args) {
         this.io = ctx.getIo();
         WorkDir workdir = ctx.getWorkDir();
 
-        if(!parseArgs(args)) {
+        if (!parseArgs(args)) {
             return;
         }
 

src/test/java/fi/helsinki/cs/tmc/cli/command/PasteCommandTest.java

@@ -105,6 +105,17 @@ public void failIfCoreIsNull() {
         io.assertNotContains("No exercise specified");
     }
 
+    @Test
+    public void setMessageAndNoMessageOption() {
+        ctx = spy(new CliContext(io, mockCore, workDir));
+        app = new Application(ctx);
+        doReturn(false).when(ctx).loadBackend();
+
+        String[] args = {"paste", "-m", "Message", "-n"};
+        app.run(args);
+        io.assertContains("You can't have the no-message flag and message set");
+    }
+
     @Test
     public void pasteRunsRightWithoutArguments() throws URISyntaxException {
         when(TmcUtil.sendPaste(eq(ctx), any(Exercise.class), anyString()))