Fix setting up the URL.

gql.go

@@ -11,7 +11,6 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/lukaszraczylo/zero"
 	"github.com/tidwall/gjson"
 	"github.com/valyala/fasthttp"
 )
@@ -19,16 +18,19 @@ import (
 // Endpoint of your GraphQL server to query
 // this variable can be overwritten by setting env variable, for example:
 // GRAPHQL_ENDPOINT=http://hasura.local/v1/graphql
-var GraphQLUrl = "http://127.0.0.1:9090/v1/graphql"
+var GraphQLUrl string
 
 type requestBase struct {
 	Query     string      `json:"query"`
 	Variables interface{} `json:"variables"`
 }
 
-func init() {
-	if !zero.IsZero(os.Getenv("GRAPHQL_ENDPOINT")) {
-		GraphQLUrl = os.Getenv("GRAPHQL_ENDPOINT")
+func prepare() {
+	value, present := os.LookupEnv("GRAPHQL_ENDPOINT")
+	if present {
+		GraphQLUrl = value
+	} else {
+		GraphQLUrl = "http://127.0.0.1:9090/v1/graphql"
 	}
 }
 
@@ -56,6 +58,7 @@ func queryBuilder(data string, variables interface{}) ([]byte, error) {
 // Variables and Headers are maps of strings ( see the example )
 // Function returns whatever specified query returns and/or error.
 func Query(query string, variables interface{}, headers map[string]interface{}) (string, error) {
+	prepare()
 	var err error
 	readyQuery, err := queryBuilder(query, variables)
 	if err != nil {

gql_test.go

@@ -2,6 +2,7 @@ package gql
 
 import (
 	"fmt"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -37,8 +38,8 @@ func Test_queryBuilder(t *testing.T) {
 			want: `{"query":"query checkifUserIsAdmin($UserID: bigint, $GroupID: bigint) { tbl_user_group_admins(where: {is_admin: {_eq: \"1\"}, user_id: {_eq: $UserID}, group_id: {_eq: $GroupID}}) { id is_admin } }","variables":{"GroupID":11007,"UserID":37}}`,
 		},
 	}
+	assert := assert.New(t)
 	for _, tt := range tests {
-		assert := assert.New(t)
 		t.Run(tt.name, func(t *testing.T) {
 			gets, err := queryBuilder(tt.args.data, tt.args.variables)
 			assert.Equal(tt.want, string(gets), "Unexpected query output in test: "+tt.name)
@@ -94,3 +95,38 @@ func ExampleQuery() {
 	}
 	fmt.Println(result)
 }
+
+func Test_initialize(t *testing.T) {
+	tests := []struct {
+		name         string
+		expected     string
+		env_endpoint string
+	}{
+		{
+			name:         "Setting env variable for endpoint",
+			env_endpoint: "hasura.local/v1/graphql",
+			expected:     "hasura.local/v1/graphql",
+		},
+		{
+			name:         "Setting default endpoint",
+			env_endpoint: "",
+			expected:     "http://127.0.0.1:9090/v1/graphql",
+		},
+	}
+	assert := assert.New(t)
+	backupEnv, present := os.LookupEnv("GRAPHQL_ENDPOINT")
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.env_endpoint != "" {
+				os.Setenv("GRAPHQL_ENDPOINT", tt.env_endpoint)
+			}
+			t.Log(tt.env_endpoint, os.Getenv("GRAPHQL_ENDPOINT"))
+			prepare()
+			assert.Equal(tt.expected, GraphQLUrl, "Unexpected value of env variable: "+tt.name)
+			os.Unsetenv("GRAPHQL_ENDPOINT")
+		})
+	}
+	if present {
+		os.Setenv("GRAPHQL_ENDPOINT", backupEnv)
+	}
+}