♿ Make Account fields as constants

It helps to avoid typos in the listing of GetAccountInfo arguments

get_account_info.go

@@ -8,8 +8,26 @@ import (
 	http "github.com/valyala/fasthttp"
 )
 
-// GetAccountInfo get information about a Telegraph account. Returns an
-// Account object on success.
+const (
+	// FieldShortName used as GetAccountInfo argument for getting account name.
+	FieldShortName = "short_name"
+
+	// FieldAuthorName used as GetAccountInfo argument for getting author name.
+	FieldAuthorName = "author_name"
+
+	// FieldAuthorURL used as GetAccountInfo argument for getting profile link.
+	FieldAuthorURL = "author_url"
+
+	// FieldAuthURL used as GetAccountInfo argument for getting URL to authorize a browser on
+	// telegra.ph.
+	FieldAuthURL = "auth_url"
+
+	// FieldPageCount used as GetAccountInfo argument for getting number of pages belonging to the
+	// Telegraph account.
+	FieldPageCount = "page_count"
+)
+
+// GetAccountInfo get information about a Telegraph account. Returns an Account object on success.
 func (account *Account) GetAccountInfo(fields ...string) (*Account, error) {
 	args := http.AcquireArgs()
 

invalid_test.go

@@ -54,7 +54,7 @@ func testInvalidEditPage(t *testing.T) {
 }
 
 func testInvalidGetAccountInfo(t *testing.T) {
-	if _, err := invalidAccount.GetAccountInfo("short_name", "page_count"); err == nil {
+	if _, err := invalidAccount.GetAccountInfo(FieldShortName, FieldPageCount); err == nil {
 		t.Error()
 	}
 }

valid_test.go

@@ -113,7 +113,7 @@ func testValidEditPage(t *testing.T) {
 }
 
 func testValidGetAccountInfo(t *testing.T) {
-	info, err := validAccount.GetAccountInfo("short_name", "page_count")
+	info, err := validAccount.GetAccountInfo(FieldShortName, FieldPageCount)
 	if err != nil {
 		t.Error(err.Error())
 		t.FailNow()