tests: add environ test

Author: 54m

environ_test.go

@@ -0,0 +1,31 @@
+package gcpen
+
+import (
+	"os"
+	"testing"
+)
+
+const (
+	testProject = "test-project"
+	testService = "test-service"
+	testVersion = "test-version"
+)
+
+func init() {
+	os.Setenv(EnvKeyGoogleCloudProject, testProject)
+	os.Setenv(EnvKeyServiceName, testService)
+	os.Setenv(EnvKeyServiceVersion, testVersion)
+}
+
+func TestEnviron(t *testing.T) {
+	Reload()
+	if ProjectID != testProject {
+		t.Fatalf("unexpected, expected: %s, actual: %#v", testProject, ProjectID)
+	}
+	if ServiceName != testService {
+		t.Fatalf("unexpected, expected: %s, actual: %#v", testService, ServiceName)
+	}
+	if ServiceVersion != testVersion {
+		t.Fatalf("unexpected, expected: %s, actual: %#v", testVersion, ServiceVersion)
+	}
+}