all

backend/internal/api/handler_test.go

@@ -0,0 +1,171 @@
+package api
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gorilla/websocket"
+
+	"monica-go-completion-backend/internal/completion"
+)
+
+type fakeCompletionService struct {
+	resp completion.Response
+	err  error
+}
+
+func (f *fakeCompletionService) Complete(_ context.Context, _ completion.Request) (completion.Response, error) {
+	if f.err != nil {
+		return completion.Response{}, f.err
+	}
+	return f.resp, nil
+}
+
+func TestRegisterRoutesCompletionSuccess(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	RegisterRoutes(r, &fakeCompletionService{
+		resp: completion.Response{Items: []completion.Item{{Label: "Println"}}, IsIncomplete: true},
+	})
+
+	body, _ := json.Marshal(map[string]any{
+		"uri":       "file:///main.go",
+		"text":      "package main",
+		"line":      0,
+		"character": 0,
+	})
+
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/completions/go", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected status 200, got %d", w.Code)
+	}
+
+	var got struct {
+		Items        []completion.Item `json:"items"`
+		IsIncomplete bool              `json:"isIncomplete"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &got); err != nil {
+		t.Fatalf("failed to decode response: %v", err)
+	}
+	if len(got.Items) != 1 || got.Items[0].Label != "Println" || !got.IsIncomplete {
+		t.Fatalf("unexpected response body: %s", w.Body.String())
+	}
+}
+
+func TestRegisterRoutesCompletionBadJSON(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	RegisterRoutes(r, &fakeCompletionService{})
+
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/completions/go", bytes.NewReader([]byte("not-json")))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("expected status 400, got %d", w.Code)
+	}
+}
+
+func TestRegisterRoutesCompletionValidationError(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	rv := &fakeCompletionService{err: completion.ErrInvalidRequest}
+	RegisterRoutes(r, rv)
+
+	body, _ := json.Marshal(map[string]any{
+		"uri":       "",
+		"text":      "",
+		"line":      -1,
+		"character": 0,
+	})
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/completions/go", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("expected status 400, got %d", w.Code)
+	}
+}
+
+func TestRegisterRoutesCompletionServerError(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	RegisterRoutes(r, &fakeCompletionService{err: errors.New("boom")})
+
+	body, _ := json.Marshal(map[string]any{
+		"uri":       "file:///main.go",
+		"text":      "package main",
+		"line":      0,
+		"character": 0,
+	})
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/completions/go", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusInternalServerError {
+		t.Fatalf("expected status 500, got %d", w.Code)
+	}
+}
+
+func TestRegisterRoutesCompletionWebSocketSuccess(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	RegisterRoutes(r, &fakeCompletionService{
+		resp: completion.Response{Items: []completion.Item{{Label: "Println"}}, IsIncomplete: false},
+	})
+
+	srv := httptest.NewServer(r)
+	defer srv.Close()
+
+	wsURL := "ws" + strings.TrimPrefix(srv.URL, "http") + "/ws/completions/go"
+	conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
+	if err != nil {
+		t.Fatalf("websocket dial failed: %v", err)
+	}
+	defer conn.Close()
+
+	req := map[string]any{
+		"id":        "1",
+		"uri":       "file:///main.go",
+		"text":      "package main",
+		"line":      0,
+		"character": 0,
+	}
+	if err := conn.WriteJSON(req); err != nil {
+		t.Fatalf("WriteJSON() failed: %v", err)
+	}
+
+	var resp struct {
+		ID           string            `json:"id"`
+		Items        []completion.Item `json:"items"`
+		IsIncomplete bool              `json:"isIncomplete"`
+		Error        string            `json:"error"`
+	}
+	if err := conn.ReadJSON(&resp); err != nil {
+		t.Fatalf("ReadJSON() failed: %v", err)
+	}
+
+	if resp.Error != "" {
+		t.Fatalf("unexpected websocket error: %s", resp.Error)
+	}
+	if resp.ID != "1" {
+		t.Fatalf("unexpected id: %s", resp.ID)
+	}
+	if len(resp.Items) != 1 || resp.Items[0].Label != "Println" {
+		t.Fatalf("unexpected items: %+v", resp.Items)
+	}
+}