[ci skip] Fix block parameter of assert_no_difference

1 files changed, 1 insertions, 1 deletions

diff --git a/guides/source/testing.md b/guides/source/testing.md
index 5509cf4d06..2067fdb383 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -462,7 +462,7 @@ Rails adds some custom assertions of its own to the `minitest` framework:
 | Assertion                                                                         | Purpose |
 | --------------------------------------------------------------------------------- | ------- |
 | `assert_difference(expressions, difference = 1, message = nil) {...}`             | Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.|
-| `assert_no_difference(expressions, message = nil, &block)`                    | Asserts that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.|
+| `assert_no_difference(expressions, message = nil, &block)`                        | Asserts that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.|
 | `assert_recognizes(expected_options, path, extras={}, message=nil)`               | Asserts that the routing of the given path was handled correctly and that the parsed options (given in the expected_options hash) match path. Basically, it asserts that Rails recognizes the route given by expected_options.|
 | `assert_generates(expected_path, options, defaults={}, extras = {}, message=nil)` | Asserts that the provided options can be used to generate the provided path. This is the inverse of assert_recognizes. The extras parameter is used to tell the request the names and values of additional request parameters that would be in a query string. The message parameter allows you to specify a custom error message for assertion failures.|
 | `assert_response(type, message = nil)`                                            | Asserts that the response comes with a specific status code. You can specify `:success` to indicate 200-299, `:redirect` to indicate 300-399, `:missing` to indicate 404, or `:error` to match the 500-599 range. You can also pass an explicit status number or its symbolic equivalent. For more information, see [full list of status codes](http://rubydoc.info/github/rack/rack/master/Rack/Utils#HTTP_STATUS_CODES-constant) and how their [mapping](http://rubydoc.info/github/rack/rack/master/Rack/Utils#SYMBOL_TO_STATUS_CODE-constant) works.|