StashRepositoryTest: No need to stub getCiSkipPhrases() everywhere

Mockito returns null for unstubbed methods on mocked classes. It's OK for
getCiSkipPhrases() to return null, as it's only used in isSkipBuild()
that can deal with null.

Stub getCiSkipPhrases() only when it's relevant to the test.

src/test/java/stashpullrequestbuilder/stashpullrequestbuilder/StashRepositoryTest.java

@@ -147,7 +147,6 @@ public void getTargetPullRequests_returns_empty_list_for_no_pull_requests() thro
   @Test
   public void getTargetPullRequests_accepts_open_pull_requests() throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
 
     assertThat(stashRepository.getTargetPullRequests(), contains(pullRequest));
   }
@@ -171,7 +170,6 @@ public void getTargetPullRequests_skips_null_state_pull_requests() throws Except
   @Test
   public void getTargetPullRequests_accepts_matching_branches() throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(trigger.getTargetBranchesToBuild()).thenReturn("release/.*,feature/.*,testing/.*");
 
     assertThat(stashRepository.getTargetPullRequests(), contains(pullRequest));
@@ -180,7 +178,6 @@ public void getTargetPullRequests_accepts_matching_branches() throws Exception {
   @Test
   public void getTargetPullRequests_accepts_matching_branches_with_padding() throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(trigger.getTargetBranchesToBuild())
         .thenReturn("\trelease/.*, \n\tfeature/.* \r\n, testing/.*\r");
 
@@ -190,7 +187,6 @@ public void getTargetPullRequests_accepts_matching_branches_with_padding() throw
   @Test
   public void getTargetPullRequests_skips_mismatching_branches() throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(trigger.getTargetBranchesToBuild()).thenReturn("release/.*,testing/.*");
 
     assertThat(stashRepository.getTargetPullRequests(), empty());
@@ -200,7 +196,6 @@ public void getTargetPullRequests_skips_mismatching_branches() throws Exception
   public void getTargetPullRequests_accepts_any_branch_if_Branches_to_Build_is_empty()
       throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(trigger.getTargetBranchesToBuild()).thenReturn("");
 
     assertThat(stashRepository.getTargetPullRequests(), contains(pullRequest));
@@ -210,7 +205,6 @@ public void getTargetPullRequests_accepts_any_branch_if_Branches_to_Build_is_emp
   public void getTargetPullRequests_accepts_any_branch_if_Branches_to_Build_is_null()
       throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(trigger.getTargetBranchesToBuild()).thenReturn(null);
 
     assertThat(stashRepository.getTargetPullRequests(), contains(pullRequest));
@@ -488,7 +482,6 @@ public void getTargetPullRequests_returns_empty_if_getPullRequests_throws() thro
   public void getTargetPullRequests_skips_pull_request_if_getPullRequestComments_throws()
       throws Exception {
     when(stashApiClient.getPullRequests()).thenReturn(pullRequestList);
-    when(trigger.getCiSkipPhrases()).thenReturn("NO TEST");
     when(stashApiClient.getPullRequestComments(any(), any(), any()))
         .thenThrow(new StashApiException("cannot read PR comments"));