fix ci

.github/workflows/e2e_test_check.yml

@@ -41,7 +41,7 @@ jobs:
     needs: job_1
     strategy:
       matrix:
-        go-version: [1.11.x, 1.12.x, 1.13.x, 1.14.x]
+        go-version: [1.11.x, 1.12.x, 1.13.x, 1.14.x, 1.15.x]
     runs-on: ubuntu-latest
     steps:
       - name: Install Go

.github/workflows/style_check.yml

@@ -13,7 +13,7 @@ jobs:
     name: vet and gofmt
     strategy:
       matrix:
-        go-version: [1.13.x, 1.14.x]
+        go-version: [1.13.x, 1.14.x, 1.15.x]
     runs-on: ubuntu-latest
     steps:
       - name: Install Go

.github/workflows/ut_check.yml

@@ -13,7 +13,7 @@ jobs:
     name: go test
     strategy:
       matrix:
-        go-version: [1.13.x, 1.14.x]
+        go-version: [1.13.x, 1.14.x, 1.15.x]
     runs-on: ubuntu-latest
     steps:
       - name: Install Go

pkg/cover/server_test.go

@@ -1,6 +1,7 @@
 package cover
 
 import (
+	"bytes"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
@@ -188,7 +189,7 @@ func TestClearService(t *testing.T) {
 
 	// get profile with invalid force parameter
 	w := httptest.NewRecorder()
-	req, _ := http.NewRequest("POST", "/v1/cover/clear", nil)
+	req, _ := http.NewRequest("POST", "/v1/cover/clear", bytes.NewBuffer([]byte(`{}`)))
 	router.ServeHTTP(w, req)
 
 	assert.Equal(t, http.StatusExpectationFailed, w.Code)