adding tests

tests/api_test.go

@@ -0,0 +1,47 @@
+package api_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/SartajBhuvaji/api"
+)
+
+func TestShortenURLHandler(t *testing.T) {
+	// create a request body
+	reqBody := map[string]string{"url": "https://www.sartaj.me"}
+	reqBytes, err := json.Marshal(reqBody)
+	if err != nil {
+		t.Fatalf("could not marshal JSON: %v", err)
+	}
+
+	// create a request
+	req, err := http.NewRequest(http.MethodPost, "/shorten", bytes.NewBuffer(reqBytes))
+	if err != nil {
+		t.Fatalf("could not create request: %v", err)
+	}
+
+	// create a response recorder
+	rec := httptest.NewRecorder()
+
+	// call the handler
+	http.HandlerFunc(api.ShortenURLHandler).ServeHTTP(rec, req)
+
+	// check the status code
+	if rec.Code != http.StatusOK {
+		t.Errorf("expected status OK; got %v", rec.Code)
+	}
+
+	// check the response body
+	var respBody map[string]string
+	if err := json.NewDecoder(rec.Body).Decode(&respBody); err != nil {
+		t.Fatalf("could not decode JSON: %v", err)
+	}
+
+	if _, ok := respBody["short_url"]; !ok {
+		t.Fatalf("response body does not have short_url field")
+	}
+}