Add delete goal endpoint (#27)

Closes #18

Reviewed-on: #27

backend/api_test.go

@@ -1,11 +1,16 @@
 package main
 
 import (
+	"strconv"
 	"testing"
 
 	"github.com/gavv/httpexpect/v2"
 )
 
+const (
+	TestGoalName = "Test Goal"
+)
+
 func startServer(t *testing.T) *httpexpect.Expect {
 	config := ServerConfig{
 		Datasource: ":memory:",
@@ -63,7 +68,7 @@ func TestCreateUserGoal(t *testing.T) {
 
 	// Create a new goal
 	requestBody := map[string]interface{}{
-		"name":   "Test Goal",
+		"name":   TestGoalName,
 		"target": 5000,
 		"weight": 10,
 	}
@@ -88,7 +93,7 @@ func TestCreateUserGoal(t *testing.T) {
 
 	goal := goals.Value(0).Object()
 	goal.Value("id").IsEqual(goalId)
-	goal.Value("name").IsEqual("Test Goal")
+	goal.Value("name").IsEqual(TestGoalName)
 	goal.Value("target").IsEqual(5000)
 	goal.Value("weight").IsEqual(10)
 	goal.Value("progress").IsEqual(0)
@@ -98,7 +103,7 @@ func TestCreateUserGoalNoUser(t *testing.T) {
 	e := startServer(t)
 
 	requestBody := map[string]interface{}{
-		"name":   "Test Goal",
+		"name":   TestGoalName,
 		"target": 5000,
 		"weight": 10,
 	}
@@ -139,7 +144,7 @@ func TestCreateUserGoalBadId(t *testing.T) {
 	e := startServer(t)
 
 	requestBody := map[string]interface{}{
-		"name":   "Test Goal",
+		"name":   TestGoalName,
 		"target": 5000,
 		"weight": 10,
 	}
@@ -149,3 +154,54 @@ func TestCreateUserGoalBadId(t *testing.T) {
 		Expect().
 		Status(400)
 }
+
+func TestDeleteUserGoal(t *testing.T) {
+	e := startServer(t)
+
+	// Create a new goal to delete
+	createRequest := map[string]interface{}{
+		"name":   TestGoalName,
+		"target": 1000,
+		"weight": 5,
+	}
+	response := e.POST("/user/1/goals").
+		WithJSON(createRequest).
+		Expect().
+		Status(201).
+		JSON().Object()
+
+	goalId := response.Value("id").Number().Raw()
+
+	// Delete the goal
+	e.DELETE("/user/1/goal/" + strconv.Itoa(int(goalId))).
+		Expect().
+		Status(200).
+		JSON().Object().Value("message").IsEqual("Goal deleted successfully")
+
+	// Verify the goal no longer exists
+	goals := e.GET("/user/1/goals").
+		Expect().
+		Status(200).
+		JSON().Array()
+	goals.Length().IsEqual(0)
+}
+
+func TestDeleteUserGoalNotFound(t *testing.T) {
+	e := startServer(t)
+
+	// Attempt to delete a non-existent goal
+	e.DELETE("/user/1/goal/999").
+		Expect().
+		Status(404).
+		JSON().Object().Value("error").IsEqual("Goal not found")
+}
+
+func TestDeleteUserGoalInvalidId(t *testing.T) {
+	e := startServer(t)
+
+	// Attempt to delete a goal with an invalid ID
+	e.DELETE("/user/1/goal/invalid-id").
+		Expect().
+		Status(400).
+		JSON().Object().Value("error").IsEqual("Invalid goal ID")
+}