diff --git a/packages/dashboard/app/utils/__tests__/copyToClipboard.test.ts b/packages/dashboard/app/utils/__tests__/copyToClipboard.test.ts
new file mode 100644
index 000000000..724fa93b5
--- /dev/null
+++ b/packages/dashboard/app/utils/__tests__/copyToClipboard.test.ts
@@ -0,0 +1,77 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { copyTextToClipboard } from "../copyToClipboard";
+
+describe("copyTextToClipboard", () => {
+  const originalClipboard = navigator.clipboard;
+
+  afterEach(() => {
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: originalClipboard,
+    });
+    vi.restoreAllMocks();
+    document.body.innerHTML = "";
+  });
+
+  it("uses Clipboard API when available", async () => {
+    const writeText = vi.fn().mockResolvedValue(undefined);
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: { writeText },
+    });
+
+    await expect(copyTextToClipboard("abc123")).resolves.toBe(true);
+    expect(writeText).toHaveBeenCalledWith("abc123");
+  });
+
+  it("falls back to execCommand when Clipboard API is unavailable", async () => {
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: undefined,
+    });
+    const execSpy = vi.spyOn(document, "execCommand").mockReturnValue(true);
+
+    await expect(copyTextToClipboard("fallback")).resolves.toBe(true);
+    expect(execSpy).toHaveBeenCalledWith("copy");
+  });
+
+  it("falls back to execCommand when Clipboard API rejects", async () => {
+    const writeText = vi.fn().mockRejectedValue(new Error("NotAllowedError"));
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: { writeText },
+    });
+    const execSpy = vi.spyOn(document, "execCommand").mockReturnValue(false);
+
+    await expect(copyTextToClipboard("reject-path")).resolves.toBe(false);
+    expect(writeText).toHaveBeenCalledWith("reject-path");
+    expect(execSpy).toHaveBeenCalledWith("copy");
+  });
+
+  it("returns false when both clipboard and fallback fail", async () => {
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: undefined,
+    });
+    vi.spyOn(document, "execCommand").mockReturnValue(false);
+
+    await expect(copyTextToClipboard("nope")).resolves.toBe(false);
+  });
+
+  it("removes temporary textarea after fallback attempts", async () => {
+    Object.defineProperty(navigator, "clipboard", {
+      configurable: true,
+      value: undefined,
+    });
+
+    const execSpy = vi.spyOn(document, "execCommand").mockReturnValue(true);
+    await copyTextToClipboard("cleanup-success");
+    expect(execSpy).toHaveBeenCalledWith("copy");
+    expect(document.querySelector("textarea")).toBeNull();
+
+    execSpy.mockReturnValueOnce(false);
+    await copyTextToClipboard("cleanup-failure");
+    expect(document.querySelector("textarea")).toBeNull();
+  });
+});