feat; run cleanup() when test runner supports teardown() (#676)

* Run cleanup() when test runner supports teardown()

* Disable ESLint for teardown() function

Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

* Ignore teardown() in code coverage because Jest does not support it

Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

Author: screendriver

src/index.js

@@ -1,14 +1,25 @@
 import {cleanup} from './pure'
 
 // if we're running in a test runner that supports afterEach
-// then we'll automatically run cleanup afterEach test
+// or teardown then we'll automatically run cleanup afterEach test
 // this ensures that tests run in isolation from each other
 // if you don't like this then either import the `pure` module
 // or set the RTL_SKIP_AUTO_CLEANUP env variable to 'true'.
-if (typeof afterEach === 'function' && !process.env.RTL_SKIP_AUTO_CLEANUP) {
-  afterEach(async () => {
-    await cleanup()
-  })
+if (!process.env.RTL_SKIP_AUTO_CLEANUP) {
+  // ignore teardown() in code coverage because Jest does not support it
+  /* istanbul ignore else */
+  if (typeof afterEach === 'function') {
+    afterEach(async () => {
+      await cleanup()
+    })
+  } else if (typeof teardown === 'function') {
+    // Block is guarded by `typeof` check.
+    // eslint does not support `typeof` guards.
+    // eslint-disable-next-line no-undef
+    teardown(async () => {
+      await cleanup()
+    })
+  }
 }
 
 export * from './pure'