Update gist create test

- use testify
- verify that the HTTP request is a POST to `/gists`
- more precise POST params matching in assertion

command/gist_test.go

@@ -1,12 +1,12 @@
 package command
 
 import (
-	"bytes"
 	"encoding/json"
 	"io/ioutil"
 	"strings"
 	"testing"
 
+	"github.com/cli/cli/pkg/httpmock"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -14,33 +14,34 @@ func TestGistCreate(t *testing.T) {
 	initBlankContext("", "OWNER/REPO", "trunk")
 
 	http := initFakeHTTP()
-	http.StubResponse(200, bytes.NewBufferString(`
+	http.Register(httpmock.REST("POST", "gists"), httpmock.StringResponse(`
 	{
 		"html_url": "https://gist.github.com/aa5a315d61ae9438b18d"
 	}
 	`))
 
 	output, err := RunCommand(`gist create "../test/fixtures/gistCreate.json" -d "Gist description" --public`)
-	eq(t, err, nil)
+	assert.NoError(t, err)
 
 	bodyBytes, _ := ioutil.ReadAll(http.Requests[0].Body)
-	reqBody := struct {
-		Description string
-		Public      bool
-		Files       map[string]struct {
-			Content string
-		}
-	}{}
-
+	reqBody := make(map[string]interface{})
 	err = json.Unmarshal(bodyBytes, &reqBody)
 	if err != nil {
-		t.Fatalf("unexpected json error: %s", err)
+		t.Fatalf("error decoding JSON: %v", err)
 	}
 
-	eq(t, reqBody.Description, "Gist description")
-	eq(t, reqBody.Public, true)
-	eq(t, reqBody.Files["gistCreate.json"].Content, "{}")
-	eq(t, output.String(), "https://gist.github.com/aa5a315d61ae9438b18d\n")
+	expectParams := map[string]interface{}{
+		"description": "Gist description",
+		"files": map[string]interface{}{
+			"gistCreate.json": map[string]interface{}{
+				"content": "{}",
+			},
+		},
+		"public": true,
+	}
+
+	assert.Equal(t, expectParams, reqBody)
+	assert.Equal(t, "https://gist.github.com/aa5a315d61ae9438b18d\n", output.String())
 }
 
 func TestGistCreate_stdin(t *testing.T) {