test: Implement tests for Stellar Wave component enhancements

src/__tests__/PayPreviewButton.test.tsx

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+import React from "react";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { useRouter } from "next/navigation";
+import PayPreviewButton from "@/components/PayPreviewButton";
+
+vi.mock("next/navigation");
+vi.mock("@/lib/freighter");
+vi.mock("@/hooks/useNetworkFeeBreakdown", () => ({
+  useNetworkFeeBreakdown: vi.fn(),
+}));
+
+const mockPush = vi.fn();
+(useRouter as any).mockReturnValue({
+  push: mockPush,
+});
+
+import { getFreighterPublicKey } from "@/lib/freighter";
+import { useNetworkFeeBreakdown } from "@/hooks/useNetworkFeeBreakdown";
+
+describe("PayPreviewButton", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockPush.mockClear();
+  });
+
+  test("renders pay button when invoice is Pending", () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+    expect(screen.getByRole("button", { name: /Pay This Invoice/ })).toBeInTheDocument();
+  });
+
+  test("shows message when invoice is not Pending", () => {
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Released" />
+    );
+    expect(screen.getByText(/This invoice is released/i)).toBeInTheDocument();
+  });
+
+  test("navigates to pay page when button clicked and wallet connected", async () => {
+    const user = userEvent.setup();
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    const button = screen.getByRole("button", { name: /Pay This Invoice/ });
+    await user.click(button);
+    await waitFor(() => {
+      expect(mockPush).toHaveBeenCalledWith("/pay/inv-1");
+    });
+  });
+
+  test("prompts wallet connection when not connected", async () => {
+    const user = userEvent.setup();
+    vi.mocked(getFreighterPublicKey)
+      .mockRejectedValueOnce(new Error("No wallet"))
+      .mockResolvedValueOnce("GKEY123");
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    expect(screen.getByText(/Requires Freighter wallet extension/i)).toBeInTheDocument();
+
+    const button = screen.getByRole("button", { name: /Pay This Invoice/ });
+    await user.click(button);
+
+    await waitFor(() => {
+      expect(screen.getByText(/Connecting wallet/i)).toBeInTheDocument();
+    });
+  });
+
+  test("displays error when wallet connection fails", async () => {
+    const user = userEvent.setup();
+    vi.mocked(getFreighterPublicKey).mockRejectedValue(
+      new Error("Connection failed")
+    );
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    const button = screen.getByRole("button", { name: /Pay This Invoice/ });
+    await user.click(button);
+
+    await waitFor(() => {
+      expect(screen.getByRole("alert")).toHaveTextContent(
+        /Could not connect wallet/i
+      );
+    });
+  });
+
+  test("displays estimated network fee when available", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    vi.mocked(useNetworkFeeBreakdown).mockReturnValue({
+      fee: 100n,
+      loading: false,
+      error: null,
+    });
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      expect(screen.getByText(/Est\. fee:/i)).toBeInTheDocument();
+    });
+  });
+
+  test("shows skeleton loader while fee is loading", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    vi.mocked(useNetworkFeeBreakdown).mockReturnValue({
+      fee: null,
+      loading: true,
+      error: null,
+    });
+
+    const { container } = render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      const skeleton = container.querySelector("[data-testid='fee-skeleton']");
+      expect(skeleton).toBeInTheDocument();
+    });
+  });
+
+  test("hides fee display when fetch fails", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    vi.mocked(useNetworkFeeBreakdown).mockReturnValue({
+      fee: null,
+      loading: false,
+      error: new Error("Network error"),
+    });
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      expect(screen.queryByText(/Est\. fee:/i)).not.toBeInTheDocument();
+    });
+  });
+
+  test("formats fee with XLM and USD equivalent", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+    vi.mocked(useNetworkFeeBreakdown).mockReturnValue({
+      fee: 100n,
+      loading: false,
+      error: null,
+    });
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      expect(screen.getByText(/0\.00001 XLM ≈ \$0\.00/)).toBeInTheDocument();
+    });
+  });
+
+  test("button shows connecting state during wallet connection", async () => {
+    const user = userEvent.setup();
+    vi.mocked(getFreighterPublicKey).mockImplementationOnce(
+      () => new Promise(resolve => setTimeout(() => resolve("GKEY123"), 100))
+    );
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    const button = screen.getByRole("button", { name: /Pay This Invoice/ });
+    await user.click(button);
+
+    await waitFor(() => {
+      expect(screen.getByRole("button", { name: /Connecting wallet/i })).toBeInTheDocument();
+    });
+  });
+
+  test("calls getFreighterPublicKey on mount", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      expect(getFreighterPublicKey).toHaveBeenCalled();
+    });
+  });
+
+  test("does not show Freighter requirement message when wallet is connected", async () => {
+    vi.mocked(getFreighterPublicKey).mockResolvedValue("GKEY123");
+
+    render(
+      <PayPreviewButton invoiceId="inv-1" status="Pending" />
+    );
+
+    await waitFor(() => {
+      expect(
+        screen.queryByText(/Requires Freighter wallet extension/i)
+      ).not.toBeInTheDocument();
+    });
+  });
+});