Add more tests (#241)

* add form builder tests

* lint

* add client tests

* lint

* add non-existent file test

client_test.go

@@ -0,0 +1,22 @@
+package openai //nolint:testpackage // testing private field
+
+import (
+	"testing"
+)
+
+func TestClient(t *testing.T) {
+	const mockToken = "mock token"
+	client := NewClient(mockToken)
+	if client.config.authToken != mockToken {
+		t.Errorf("Client does not contain proper token")
+	}
+
+	const mockOrg = "mock org"
+	client = NewOrgClient(mockToken, mockOrg)
+	if client.config.authToken != mockToken {
+		t.Errorf("Client does not contain proper token")
+	}
+	if client.config.OrgID != mockOrg {
+		t.Errorf("Client does not contain proper orgID")
+	}
+}