fix missing route params for CreateTestContext (#2778)

context_test.go

@@ -144,7 +144,7 @@ func TestSaveUploadedCreateFailed(t *testing.T) {
 
 func TestContextReset(t *testing.T) {
 	router := New()
-	c := router.allocateContext()
+	c := router.allocateContext(0)
 	assert.Equal(t, c.engine, router)
 
 	c.index = 2
@@ -2147,3 +2147,17 @@ func TestContextAddParam(t *testing.T) {
 	assert.Equal(t, ok, true)
 	assert.Equal(t, value, v)
 }
+
+func TestCreateTestContextWithRouteParams(t *testing.T) {
+	w := httptest.NewRecorder()
+	engine := New()
+	engine.GET("/:action/:name", func(ctx *Context) {
+		ctx.String(http.StatusOK, "%s %s", ctx.Param("action"), ctx.Param("name"))
+	})
+	c := CreateTestContextOnly(w, engine)
+	c.Request, _ = http.NewRequest(http.MethodGet, "/hello/gin", nil)
+	engine.HandleContext(c)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	assert.Equal(t, "hello gin", w.Body.String())
+}

gin.go

@@ -187,7 +187,7 @@ func New() *Engine {
 	}
 	engine.RouterGroup.engine = engine
 	engine.pool.New = func() interface{} {
-		return engine.allocateContext()
+		return engine.allocateContext(engine.maxParams)
 	}
 	return engine
 }
@@ -200,8 +200,8 @@ func Default() *Engine {
 	return engine
 }
 
-func (engine *Engine) allocateContext() *Context {
-	v := make(Params, 0, engine.maxParams)
+func (engine *Engine) allocateContext(maxParams uint16) *Context {
+	v := make(Params, 0, maxParams)
 	return &Context{engine: engine, params: &v}
 }
 

test_helpers.go

@@ -9,7 +9,15 @@ import "net/http"
 // CreateTestContext returns a fresh engine and context for testing purposes
 func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine) {
 	r = New()
-	c = r.allocateContext()
+	c = r.allocateContext(0)
+	c.reset()
+	c.writermem.reset(w)
+	return
+}
+
+// CreateTestContextOnly returns a fresh context base on the engine for testing purposes
+func CreateTestContextOnly(w http.ResponseWriter, r *Engine) (c *Context) {
+	c = r.allocateContext(r.maxParams)
 	c.reset()
 	c.writermem.reset(w)
 	return