Enable single thread mode for runner

Some runners for tools that can not be run in parallel need a way to specify that they should not be executed in parallel. This commits adds this functionality. Closes #5706
jestjs · Mar 4, 2018 · 63e9257 · 63e9257
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -14,6 +14,8 @@
   promises ([#5670](https://github.com/facebook/jest/pull/5670))
 * `[expect]` Add isError to utils
   ([#5670](https://github.com/facebook/jest/pull/5670))
+* `[jest-cli]` Add `serial` property that runners can expose to specify that
+  they can not run in parallel (#5706)
 
 ### Fixes
 

diff --git a/docs/Configuration.md b/docs/Configuration.md
@@ -703,6 +703,10 @@ async runTests(
 ): Promise<void>
 ```
 
+If you need to restrict your test-runner to only run in serial rather then being
+exectued in paralell your class should have the static attribute `serial` to be
+set as `true`.
+
 ### `setupFiles` [array]
 
 Default: `[]`

diff --git a/packages/jest-cli/src/test_scheduler.js b/packages/jest-cli/src/test_scheduler.js
@@ -192,7 +192,7 @@ export default class TestScheduler {
             onResult,
             onFailure,
             {
-              serial: runInBand,
+              serial: runInBand || testRunners[runner].serial,
             },
           );
         }