Adds extra test for postgres case

store/postgres_test.go

@@ -97,6 +97,30 @@ func TestInsertPlan(t *testing.T) {
 
 }
 
+func TestInsertPlanErr(t *testing.T) {
+	// setup
+	assert := assert.New(t)
+
+	str, mock := getDbMock(t)
+	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
+	plan := &models.Plan{PlanDate: planDate}
+
+	mock.ExpectBegin()
+	mock.ExpectQuery("^INSERT INTO plans \\(plan_date\\) VALUES \\(\\$1\\) RETURNING plan_id$").
+		WithArgs(planDate).
+		WillReturnError(fmt.Errorf("example error"))
+	mock.ExpectRollback()
+
+	// function under test
+	_, err := str.InsertPlan(plan)
+	// check results
+	assert.NotNil(err)
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Errorf("unfulfilled expectations: %s", err)
+	}
+
+}
+
 func TestErrPlanByID(t *testing.T) {
 	assert := assert.New(t)