KAN-35 ticket changes

tests/Fixtures/ticket-detail-browser.mjs

@@ -342,6 +342,47 @@ try {
         .waitFor();
     await page.getByRole('button', { name: 'Create now', exact: true }).click();
     await dialog.waitFor({ state: 'hidden' });
+    await visit('?slowBranch&serverError');
+    await page
+        .getByRole('button', { name: 'Create branch', exact: true })
+        .click();
+    await page
+        .getByText('Branch name is available.', { exact: true })
+        .waitFor();
+    await page
+        .getByLabel('Branch name', { exact: true })
+        .fill('feature/ENG-42-preserve-this-name');
+    await page
+        .getByText('Branch name is available.', { exact: true })
+        .waitFor();
+    const failedBranchCreation = page.waitForResponse(
+        (response) =>
+            response.url().includes('/tickets/42/branches') &&
+            response.request().method() === 'POST',
+    );
+    await page.getByRole('button', { name: 'Create now', exact: true }).click();
+    await page.getByText('Creating branch…', { exact: true }).waitFor();
+    assert.equal(
+        await page
+            .locator('button[type="submit"]')
+            .last()
+            .getAttribute('aria-busy'),
+        'true',
+    );
+    assert.equal((await failedBranchCreation).status(), 503);
+    await page
+        .getByText('The request could not be completed', { exact: true })
+        .waitFor();
+    assert.equal(
+        await page.getByLabel('Branch name', { exact: true }).inputValue(),
+        'feature/ENG-42-preserve-this-name',
+    );
+    assert.equal(await page.getByRole('dialog').isVisible(), true);
+    await page.getByLabel('Branch name', { exact: true }).fill('eng-42-cache');
+    await page
+        .getByText('Branch name is available.', { exact: true })
+        .waitFor();
+    await page.keyboard.press('Escape');
     const linkSaved = page.waitForResponse(
         (response) =>
             response.url().includes('/tickets/42/links') &&