fix: improve chart rendering tests and response handling#3164
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Summary of ChangesHello @robfrank, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request refines existing end-to-end tests to enhance their stability and accuracy. The changes primarily focus on improving synchronization mechanisms within tests, ensuring that UI elements like charts and data tables are fully rendered and populated with data before assertions are made. This addresses potential flakiness due to asynchronous operations and improves the overall reliability of the test suite. Highlights
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Code Review
This pull request improves the E2E tests by enhancing response handling and fixing potential flakiness in chart rendering tests. The changes in apexcharts-upgrade.spec.ts correctly wait for API responses before making assertions, which is a solid improvement. However, in datatables-compatibility.spec.ts, a fixed timeout (waitForTimeout) has been introduced, which is an anti-pattern that can lead to flaky tests. My review includes suggestions to replace this with more robust, condition-based waits to improve test reliability.
| // Wait a moment for graph rendering to stabilize before switching tabs | ||
| await page.waitForTimeout(1000); | ||
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| // Switch to Table tab | ||
| await page.locator('a[href="#tab-table"]').click({ force: true }); |
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Using page.waitForTimeout() is an anti-pattern in Playwright tests as it can lead to flakiness. The test might pass locally but fail in a different environment (like CI) where rendering takes more or less time. It's better to wait for a specific condition or element state.
Since the comment mentions waiting for graph rendering to stabilize, you should wait for a specific element from the graph to be ready. For example, you can wait for the graph canvas to become visible. This provides a more reliable signal that it's safe to proceed.
Additionally, the use of { force: true } is often a sign that the previous wait is insufficient. After switching to a more reliable wait, you should be able to remove force: true.
| // Wait a moment for graph rendering to stabilize before switching tabs | |
| await page.waitForTimeout(1000); | |
| // Switch to Table tab | |
| await page.locator('a[href="#tab-table"]').click({ force: true }); | |
| // Wait for graph rendering to complete before switching tabs | |
| await expect(page.locator('canvas').last()).toBeVisible(); | |
| // Switch to Table tab | |
| await page.locator('a[href="#tab-table"]').click(); |
| const responsePromise = page.waitForResponse(response => | ||
| response.url().includes('api/v1/server') | ||
| ); |
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While waiting for the response is a great improvement for test stability, the URL matcher response.url().includes('api/v1/server') is a bit broad and could potentially match other API calls (e.g., /api/v1/server/status). It also doesn't guarantee the request was successful.
To make this more robust, I'd recommend also checking for a successful response status using response.ok(). This ensures you're waiting for a valid response before proceeding with assertions.
| const responsePromise = page.waitForResponse(response => | |
| response.url().includes('api/v1/server') | |
| ); | |
| const responsePromise = page.waitForResponse(response => | |
| response.url().includes('api/v1/server') && response.ok() | |
| ); |
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(cherry picked from commit fa7ddc5)
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