test: improve coverage for PullIsMergeable method call

Signed-off-by: Caio Augusto <[email protected]>

Author: CaioAugustoo

server/events/vcs/gitlab_client_test.go

@@ -833,7 +833,7 @@ func TestGitlabClient_PullIsMergeable(t *testing.T) {
 							w.Write([]byte(response)) // nolint: errcheck
 						case fmt.Sprintf("/api/v4/projects/runatlantis%%2Fatlantis/merge_requests/%v/approvals", needsApprovalMR):
 							w.WriteHeader(http.StatusOK)
-							response := fmt.Sprintf(`{"id":%v,"name":"%s","rule_type":"regular","report_type":null,"eligible_approvers":[{"id":5,"name":"John Doe","username":"jdoe","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/jdoe"},{"id":50,"name":"Group Member 1","username":"group_member_1","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/group_member_1"}],"approvals_required":0,"approvals_left":2,"users":[{"id":5,"name":"John Doe","username":"jdoe","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/jdoe"}],"contains_hidden_groups":false}`, needsApprovalMR, c.statusName)
+							response := fmt.Sprintf(`{"id":%v,"name":"%s","rule_type":"regular","report_type":null,"eligible_approvers":[{"id":5,"name":"John Doe","username":"jdoe","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/jdoe"},{"id":50,"name":"Group Member 1","username":"group_member_1","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/group_member_1"}],"approvals_required":0,"approvals_left":3,"users":[{"id":5,"name":"John Doe","username":"jdoe","state":"active","avatar_url":"https://www.gravatar.com/avatar/0?s=80&d=identicon","web_url":"http://localhost/jdoe"}],"contains_hidden_groups":false}`, needsApprovalMR, c.statusName)
 							w.Write([]byte(response)) // nolint: errcheck
 						case fmt.Sprintf("/api/v4/projects/runatlantis%%2Fatlantis/merge_requests/%v", noHeadPipelineMR):
 							w.WriteHeader(http.StatusOK)