feat: add diagnostic web app shell

internal/webapp/assets_test.go

@@ -0,0 +1,36 @@
+package webapp
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestHandlerServesIndex(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	rec := httptest.NewRecorder()
+
+	Handler().ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d", rec.Code)
+	}
+	if !strings.Contains(rec.Body.String(), "Interview practice") {
+		t.Fatal("expected app shell content")
+	}
+}
+
+func TestHandlerServesAsset(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/assets/app.js", nil)
+	rec := httptest.NewRecorder()
+
+	Handler().ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d", rec.Code)
+	}
+	if !strings.Contains(rec.Body.String(), "diagnostic-sessions") {
+		t.Fatal("expected app script content")
+	}
+}