docs: fix format of testing/overview.rst

Author: kenjis

user_guide_src/source/testing/overview.rst

@@ -80,7 +80,7 @@ To test a new library, **Foo**, you would create a new file at **tests/app/Libra
         }
     }
 
-To test one of your models, you might end up with something like this in ``tests/app/Models/OneOfMyModelsTest.php``::
+To test one of your models, you might end up with something like this in **tests/app/Models/OneOfMyModelsTest.php**::
 
     <?php
 
@@ -203,7 +203,7 @@ Ensure that an event you expected to be triggered actually was::
 
     $this->assertEventTriggered('foo');
 
-**assertHeaderEmitted($header, $ignoreCase=false)**
+**assertHeaderEmitted($header, $ignoreCase = false)**
 
 Ensure that a header or cookie was actually emitted::
 
@@ -218,7 +218,7 @@ Ensure that a header or cookie was actually emitted::
 Note: the test case with this should be `run as a separate process
 in PHPunit <https://phpunit.readthedocs.io/en/7.4/annotations.html#runinseparateprocess>`_.
 
-**assertHeaderNotEmitted($header, $ignoreCase=false)**
+**assertHeaderNotEmitted($header, $ignoreCase = false)**
 
 Ensure that a header or cookie was not emitted::
 
@@ -233,7 +233,7 @@ Ensure that a header or cookie was not emitted::
 Note: the test case with this should be `run as a separate process
 in PHPunit <https://phpunit.readthedocs.io/en/7.4/annotations.html#runinseparateprocess>`_.
 
-**assertCloseEnough($expected, $actual, $message='', $tolerance=1)**
+**assertCloseEnough($expected, $actual, $message = '', $tolerance = 1)**
 
 For extended execution time testing, tests that the absolute difference
 between expected and actual time is within the prescribed tolerance.::
@@ -244,7 +244,7 @@ between expected and actual time is within the prescribed tolerance.::
 
 The above test will allow the actual time to be either 660 or 661 seconds.
 
-**assertCloseEnoughString($expected, $actual, $message='', $tolerance=1)**
+**assertCloseEnoughString($expected, $actual, $message = '', $tolerance = 1)**
 
 For extended execution time testing, tests that the absolute difference
 between expected and actual time, formatted as strings, is within the prescribed tolerance.::