chore: add lagoondb ProjectGroupIDs tests

internal/lagoondb/client_test.go

@@ -49,7 +49,8 @@ func TestLastUsed(t *testing.T) {
 			} else {
 				assert.NoError(tt, err, name)
 			}
-			// check expectations
+			// expect an error here in the expectError case because WithArgs has not
+			// be called with the expected value.
 			err = mock.ExpectationsWereMet()
 			if tc.expectError {
 				assert.Error(tt, err, name)
@@ -59,3 +60,57 @@ func TestLastUsed(t *testing.T) {
 		})
 	}
 }
+
+func TestProjectGroupIDs(t *testing.T) {
+	var testCases = map[string]struct {
+		projectID   int
+		expectError bool
+		rows        *sqlmock.Rows
+		error       error
+	}{
+		"single-group project": {
+			projectID:   12,
+			expectError: false,
+			rows: sqlmock.NewRows([]string{"group_id"}).
+				AddRow("d79a42a6-a5b0-4d37-a1dd-44c2b1f6fddc"),
+		},
+		"multi-group project": {
+			projectID:   12,
+			expectError: false,
+			rows: sqlmock.NewRows([]string{"group_id"}).
+				AddRow("486765ce-14ec-4ad8-a454-e026b8cc52a4").
+				AddRow("d79a42a6-a5b0-4d37-a1dd-44c2b1f6fddc"),
+		},
+		"no results": {
+			projectID:   12,
+			expectError: true,
+			rows:        sqlmock.NewRows([]string{"group_id"}),
+			error:       lagoondb.ErrNoResult,
+		},
+	}
+	for name, tc := range testCases {
+		t.Run(name, func(tt *testing.T) {
+			// set up mocks
+			mockDB, mock, err := sqlmock.New()
+			assert.NoError(tt, err, name)
+			mock.ExpectQuery(
+				`SELECT group_id ` +
+					`FROM kc_group_projects ` +
+					`WHERE project_id = (.+)`).
+				WithArgs(tc.projectID).
+				WillReturnRows(tc.rows).
+				WillReturnError(tc.error)
+			// execute expected database operations
+			db := lagoondb.NewClientFromDB(mockDB)
+			_, err = db.ProjectGroupIDs(context.Background(), tc.projectID)
+			if tc.expectError {
+				assert.Error(tt, err, name)
+			} else {
+				assert.NoError(tt, err, name)
+			}
+			// check expectations
+			err = mock.ExpectationsWereMet()
+			assert.NoError(tt, err, name)
+		})
+	}
+}