テストを書いた

model/comments.go

@@ -1,5 +1,7 @@
 package model
 
+import "fmt"
+
 type Comment struct {
 	GormModel
 	ItemID  int    `gorm:"type:int;not null" json:"item_id"`
@@ -18,6 +20,15 @@ type CreateCommentPayload struct {
 }
 
 func CreateComment(p *CreateCommentPayload) (*Comment, error) {
+	if p.ItemID == 0 {
+		return nil, fmt.Errorf("ItemID is required")
+	}
+	if p.UserID == "" {
+		return nil, fmt.Errorf("UserID is required")
+	}
+	if p.Comment == "" {
+		return nil, fmt.Errorf("Comment is required")
+	}
 	c := &Comment{
 		ItemID:  p.ItemID,
 		UserID:  p.UserID,

model/comments_test.go

@@ -0,0 +1,64 @@
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateComment(t *testing.T) {
+	cases := []struct {
+		name    string
+		payload *CreateCommentPayload
+		fail    bool
+	}{
+		{
+			name: "正常系",
+			payload: &CreateCommentPayload{
+				ItemID:  1,
+				UserID:  "user1",
+				Comment: "comment1",
+			},
+			fail: false,
+		},
+		{
+			name: "異常系: ItemIDが存在しない",
+			payload: &CreateCommentPayload{
+				UserID:  "user1",
+				Comment: "comment1",
+			},
+			fail: true,
+		},
+		{
+			name: "異常系: UserIDが存在しない",
+			payload: &CreateCommentPayload{
+				ItemID:  1,
+				Comment: "comment1",
+			},
+			fail: true,
+		},
+		{
+			name: "異常系: Commentが存在しない",
+			payload: &CreateCommentPayload{
+				ItemID: 1,
+				UserID: "user1",
+			},
+			fail: true,
+		},
+	}
+
+	assert := assert.New(t)
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			c, err := CreateComment(tt.payload)
+			if tt.fail {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+				assert.Equal(tt.payload.ItemID, c.ItemID)
+				assert.Equal(tt.payload.UserID, c.UserID)
+				assert.Equal(tt.payload.Comment, c.Comment)
+			}
+		})
+	}
+}

router/comments.go

@@ -1,14 +1,15 @@
 package router
 
 import (
+	"fmt"
 	"strconv"
 
 	"github.com/labstack/echo/v4"
 	"github.com/traPtitech/booQ-v3/model"
 )
 
 type PostCommentBody struct {
-	Comment string `json:"comment"`
+	Text string `json:"text"`
 }
 
 type PostCommentResponse struct {
@@ -29,11 +30,14 @@ func PostComment(c echo.Context) error {
 	if err := c.Bind(&body); err != nil {
 		return invalidRequest(c, err)
 	}
+	if body.Text == "" {
+		return invalidRequest(c, fmt.Errorf("text is empty"))
+	}
 
 	payload := model.CreateCommentPayload{
 		ItemID:  itemID,
 		UserID:  me,
-		Comment: body.Comment,
+		Comment: body.Text,
 	}
 	comment, err := model.CreateComment(&payload)
 	if err != nil {

router/comments_test.go

@@ -0,0 +1,46 @@
+package router
+
+import (
+	"testing"
+
+	"github.com/labstack/echo/v4"
+	"github.com/stretchr/testify/assert"
+	"github.com/traPtitech/booQ-v3/model"
+)
+
+func TestPostComment(t *testing.T) {
+	model.PrepareTestDatabase()
+
+	e := echo.New()
+	SetupRouting(e, CreateUserProvider("s9"))
+
+	cases := []struct {
+		name     string
+		payload  string
+		expected int
+	}{
+		{
+			name:     "正常系",
+			payload:  `{"text":"テストコメント"}`,
+			expected: 201,
+		},
+		{
+			name:     "異常系: 空文字列",
+			payload:  `{"text":""}`,
+			expected: 400,
+		},
+		{
+			name:     "異常系: パラメータ不足",
+			payload:  `{}`,
+			expected: 400,
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			assert := assert.New(t)
+			rec := PerformMutation(e, "POST", "/api/items/1/comments", tc.payload)
+			assert.Equal(tc.expected, rec.Code)
+		})
+	}
+}

router/test_common.go

@@ -0,0 +1,16 @@
+package router
+
+import (
+	"net/http/httptest"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+)
+
+func PerformMutation(e *echo.Echo, method, path, payload string) *httptest.ResponseRecorder {
+	req := httptest.NewRequest(method, path, strings.NewReader(payload))
+	req.Header.Set("Content-Type", "application/json")
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+	return rec
+}