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docs: note that sharding only works for parallel tests (#30272)

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References #30253.
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docs/src/test-sharding-js.md
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@ -5,7 +5,7 @@ title: "Sharding"
## Introduction
By default, Playwright runs tests in [parallel](/test-parallel.md) and strives for optimal utilization of CPU cores on your machine. In order to achieve even greater parallelisation, you can further scale Playwright test execution by running tests on multiple machines simultaneously. We call this mode of operation "sharding".
By default, Playwright runs test files in [parallel](./test-parallel.md) and strives for optimal utilization of CPU cores on your machine. In order to achieve even greater parallelisation, you can further scale Playwright test execution by running tests on multiple machines simultaneously. We call this mode of operation "sharding".
## Sharding tests between multiple machines
@ -20,6 +20,8 @@ npx playwright test --shard=4/4
Now, if you run these shards in parallel on different computers, your test suite completes four times faster.
Note that Playwright can only shard tests that can be run in parallel. By default, this means Playwright will shard test files. Learn about other options in the [parallelism guide](./test-parallel.md).
## Merging reports from multiple shards
In the previous example, each test shard has its own test report. If you want to have a combined report showing all the test results from all the shards, you can merge them.