[docs] Minor typo fix in testing docs (#19146)

mui · Jan 9, 2020 · a1dffb9 · a1dffb9
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diff --git a/docs/src/pages/guides/testing/testing.md b/docs/src/pages/guides/testing/testing.md
@@ -6,7 +6,7 @@ Examples in this guide use [global methods from Mocha](https://mochajs.org/api/g
 
 ## Internal
 
-Material-UI has a wide **a wide range** of tests so we can
+Material-UI has **a wide range** of tests so we can
 iterate with confidence on the components, for instance, the visual regression tests provided by [Argos-CI](https://www.argos-ci.com/mui-org/material-ui) have proven to be really helpful.
 To learn more about the internal tests, you can have a look at the [README](https://github.com/mui-org/material-ui/blob/master/test/README.md).