Process completed with exit code 1.

Process completed with exit code 2.

1) [chromium] › emailWorkflow.test.ts:115:1 › register via new-user invitation email ───────────── Error: Failed to find email: Project invitation: (0) Timeout 10000ms exceeded while waiting on the predicate at pages/mailPages.ts:38 36 | } 37 | await email.click(); > 38 | }, `Failed to find email: ${subject} (${index})`).toPass({timeout: 10_000}); // This auto-retries on a reasonable schedule | ^ 39 | return await this.getEmailPage().waitFor(); 40 | } 41 | } at MailinatorInboxPage.openEmail (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/pages/mailPages.ts:38:55) at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/emailWorkflow.test.ts:134:37

1) [chromium] › emailWorkflow.test.ts:115:1 › register via new-user invitation email ───────────── Retry #1 ─────────────────────────────────────────────────────────────────────────────────────── Error: Failed to find email: Project invitation: (0) Timeout 10000ms exceeded while waiting on the predicate at pages/mailPages.ts:38 36 | } 37 | await email.click(); > 38 | }, `Failed to find email: ${subject} (${index})`).toPass({timeout: 10_000}); // This auto-retries on a reasonable schedule | ^ 39 | return await this.getEmailPage().waitFor(); 40 | } 41 | } at MailinatorInboxPage.openEmail (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/pages/mailPages.ts:38:55) at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/emailWorkflow.test.ts:134:37

2) [chromium] › resetProject.test.ts:20:1 › reset project and upload .zip file ─────────────────── Error: Timed out 5000ms waiting for expect(locator).toBeVisible() Locator: getByText('Project successfully reset') Expected: visible Received: <element(s) not found> Call log: - expect.toBeVisible with timeout 5000ms - waiting for getByText('Project successfully reset') 73 | await resetProjectModel.clickNextStepButton('Reset project'); 74 | await resetProjectModel.uploadProjectZipFile(join(tempDir, 'reset-project-test-step-1.zip')); > 75 | await expect(page.getByText('Project successfully reset')).toBeVisible(); | ^ 76 | await page.getByRole('button', { name: 'Close' }).click(); 77 | await resetProjectModel.assertGone(); 78 | at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/resetProject.test.ts:75:62

2) [chromium] › resetProject.test.ts:20:1 › reset project and upload .zip file ─────────────────── Error: Unexpected response status: 500. (Request URL: https://staging.languagedepot.org/api/project/upload-zip/test-reset-project-and-upload-zip-file-fc95993af9013e6c5450-6e85e0716fb6a9bfa2aa-c770ee11/e096f221647749819ff3941da34d3a3c. Traceparent: 00-54ae4408bc64c5b8dbddac738b0b7fb0-b25a0a0fcc4928aa-01.) expect(received).toBeLessThan(expected) Expected: < 500 Received: 500 at fixtures.ts:40 38 | const url = response.request().url(); 39 | const unexpectedResponseMessage = `Unexpected response status: ${status}. (Request URL: ${url}. Traceparent: ${traceparent}.)`; > 40 | expect.soft(response.status(), unexpectedResponseMessage).toBeLessThan(500); | ^ 41 | if (response.request().isNavigationRequest()) { 42 | expect.soft(response.status(), unexpectedResponseMessage).toBeLessThan(400); 43 | } at BrowserContext.<anonymous> (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/fixtures.ts:40:63)

2) [chromium] › resetProject.test.ts:20:1 › reset project and upload .zip file ─────────────────── Retry #1 ─────────────────────────────────────────────────────────────────────────────────────── Error: Timed out 5000ms waiting for expect(locator).toBeVisible() Locator: getByText('Project successfully reset') Expected: visible Received: <element(s) not found> Call log: - expect.toBeVisible with timeout 5000ms - waiting for getByText('Project successfully reset') 73 | await resetProjectModel.clickNextStepButton('Reset project'); 74 | await resetProjectModel.uploadProjectZipFile(join(tempDir, 'reset-project-test-step-1.zip')); > 75 | await expect(page.getByText('Project successfully reset')).toBeVisible(); | ^ 76 | await page.getByRole('button', { name: 'Close' }).click(); 77 | await resetProjectModel.assertGone(); 78 | at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/resetProject.test.ts:75:62

3) [firefox] › emailWorkflow.test.ts:28:1 › register, verify, update, verify email address ─────── Error: Failed to find email: Verify your e-mail address (0) Timeout 10000ms exceeded while waiting on the predicate at pages/mailPages.ts:38 36 | } 37 | await email.click(); > 38 | }, `Failed to find email: ${subject} (${index})`).toPass({timeout: 10_000}); // This auto-retries on a reasonable schedule | ^ 39 | return await this.getEmailPage().waitFor(); 40 | } 41 | } at MailinatorInboxPage.openEmail (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/pages/mailPages.ts:38:55) at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/emailWorkflow.test.ts:39:35

3) [firefox] › emailWorkflow.test.ts:28:1 › register, verify, update, verify email address ─────── Retry #1 ─────────────────────────────────────────────────────────────────────────────────────── Error: Failed to find email: Verify your e-mail address (0) Timeout 10000ms exceeded while waiting on the predicate at pages/mailPages.ts:38 36 | } 37 | await email.click(); > 38 | }, `Failed to find email: ${subject} (${index})`).toPass({timeout: 10_000}); // This auto-retries on a reasonable schedule | ^ 39 | return await this.getEmailPage().waitFor(); 40 | } 41 | } at MailinatorInboxPage.openEmail (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/pages/mailPages.ts:38:55) at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/emailWorkflow.test.ts:39:35

4) [firefox] › resetProject.test.ts:20:1 › reset project and upload .zip file ──────────────────── Error: Timed out 5000ms waiting for expect(locator).toBeVisible() Locator: getByText('Project successfully reset') Expected: visible Received: <element(s) not found> Call log: - expect.toBeVisible with timeout 5000ms - waiting for getByText('Project successfully reset') 33 | await resetProjectModel.clickNextStepButton('Reset project'); 34 | await resetProjectModel.uploadProjectZipFile('tests/data/test-project-one-commit.zip'); > 35 | await expect(page.getByText('Project successfully reset')).toBeVisible(); | ^ 36 | await page.getByRole('button', { name: 'Close' }).click(); 37 | await resetProjectModel.assertGone(); 38 | at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/resetProject.test.ts:35:62

4) [firefox] › resetProject.test.ts:20:1 › reset project and upload .zip file ──────────────────── Retry #1 ─────────────────────────────────────────────────────────────────────────────────────── Error: Timed out 5000ms waiting for expect(locator).toBeVisible() Locator: getByText('Project successfully reset') Expected: visible Received: <element(s) not found> Call log: - expect.toBeVisible with timeout 5000ms - waiting for getByText('Project successfully reset') 33 | await resetProjectModel.clickNextStepButton('Reset project'); 34 | await resetProjectModel.uploadProjectZipFile('tests/data/test-project-one-commit.zip'); > 35 | await expect(page.getByText('Project successfully reset')).toBeVisible(); | ^ 36 | await page.getByRole('button', { name: 'Close' }).click(); 37 | await resetProjectModel.assertGone(); 38 | at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/resetProject.test.ts:35:62

5) [firefox] › userPage.test.ts:31:1 › can reset password ──────────────────────────────────────── Error: Failed to find email: Your password was changed (0) Timeout 10000ms exceeded while waiting on the predicate at pages/mailPages.ts:38 36 | } 37 | await email.click(); > 38 | }, `Failed to find email: ${subject} (${index})`).toPass({timeout: 10_000}); // This auto-retries on a reasonable schedule | ^ 39 | return await this.getEmailPage().waitFor(); 40 | } 41 | } at MailinatorInboxPage.openEmail (/home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/pages/mailPages.ts:38:55) at /home/runner/work/languageforge-lexbox/languageforge-lexbox/frontend/tests/userPage.test.ts:50:37

Process completed with exit code 1.

Process completed with exit code 2.

Process completed with exit code 1.

Process completed with exit code 1.

Process completed with exit code 1.

Process completed with exit code 1.

5 failed [chromium] › emailWorkflow.test.ts:115:1 › register via new-user invitation email ────────────── [chromium] › resetProject.test.ts:20:1 › reset project and upload .zip file ──────────────────── [firefox] › emailWorkflow.test.ts:28:1 › register, verify, update, verify email address ──────── [firefox] › resetProject.test.ts:20:1 › reset project and upload .zip file ───────────────────── [firefox] › userPage.test.ts:31:1 › can reset password ───────────────────────────────────────── 3 flaky [chromium] › emailWorkflow.test.ts:28:1 › register, verify, update, verify email address ─────── [firefox] › emailWorkflow.test.ts:78:1 › forgot password ─────────────────────────────────────── [firefox] › emailWorkflow.test.ts:115:1 › register via new-user invitation email ─────────────── 54 passed (9.1m)

The variable 'doNothing' is assigned but its value is never used

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Parameter 'logger' is unread.

Parameter 'lexAuthService' is unread.

Parameter 'hgService' is unread.

'JwtBearerOptions.SecurityTokenValidators' is obsolete: 'SecurityTokenValidators is no longer used by default. Use TokenHandlers instead. To continue using SecurityTokenValidators, set UseSecurityTokenValidators to true. See https://aka.ms/aspnetcore8/security-token-changes'

Parameter 'lexAuthService' is unread.

Parameter 'lexBoxDbContext' is unread.

The switch expression does not handle some values of its input type (it is not exhaustive) involving an unnamed enum value. For example, the pattern '(LexBoxApi.Services.RepoEmptyState)2' is not covered.

No files were found with the provided path: ./test-results. No artifacts will be uploaded.

The support for python 2.7 was removed on June 19, 2023. Related issue: https://github.com/actions/setup-python/issues/672

The variable 'doNothing' is assigned but its value is never used

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Found version-specific or distribution-specific runtime identifier(s): debian-x64, fedora-x64, opensuse-x64, rhel-x64, win7-arm, win7-x64, win7-x86. Affected libraries: Libuv. In .NET 8.0 and higher, assets for version-specific and distribution-specific runtime identifiers will not be found by default. See https://aka.ms/dotnet/rid-usage for details.

Found version-specific or distribution-specific runtime identifier(s): debian-x64, fedora-x64, opensuse-x64, rhel-x64, win7-arm, win7-x64, win7-x86. Affected libraries: Libuv. In .NET 8.0 and higher, assets for version-specific and distribution-specific runtime identifiers will not be found by default. See https://aka.ms/dotnet/rid-usage for details.

Parameter 'logger' is unread.

frontend/[firefox] › errorHandling.test.ts took 40.1s

frontend/[chromium] › errorHandling.test.ts took 30.9s

frontend/[chromium] › userPage.test.ts took 19.1s

The variable 'doNothing' is assigned but its value is never used

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Parameter 'logger' is unread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Found version-specific or distribution-specific runtime identifier(s): debian-x64, fedora-x64, opensuse-x64, rhel-x64, win7-arm, win7-x64, win7-x86. Affected libraries: Libuv. In .NET 8.0 and higher, assets for version-specific and distribution-specific runtime identifiers will not be found by default. See https://aka.ms/dotnet/rid-usage for details.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Parameter 'logger' is unread.

The variable 'doNothing' is assigned but its value is never used

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Parameter 'logger' is unread.

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

The using directive for 'Crdt' appeared previously in this namespace

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The variable 'doNothing' is assigned but its value is never used

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

The event 'LcmThreadedProgress.Canceling' is never used

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Observe the awaitable result of this method call by awaiting it, assigning to a variable, or passing it to another method (https://github.com/Microsoft/vs-threading/blob/main/doc/analyzers/VSTHRD110.md)

Parameter 'logger' is unread.

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

The using directive for 'Crdt' appeared previously in this namespace

Parameter 'timeProvider' is unread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Parameter 'logger' is unread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.