restructure testing category (#5318)

README.md

@@ -152,6 +152,11 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
   - [Stream Processing](#stream-processing)
   - [Template Engines](#template-engines)
   - [Testing](#testing)
+    - [Testing Frameworks](#testing-frameworks)
+    - [Mock](#mock)
+    - [Fuzzing and delta-debugging/reducing/shrinking](#fuzzing-and-delta-debuggingreducingshrinking)
+    - [Selenium and browser control tools](#selenium-and-browser-control-tools)
+    - [Fail injection](#fail-injection)
   - [Text Processing](#text-processing)
     - [Formatters](#formatters)
     - [Markup Languages](#markup-languages)
@@ -2319,7 +2324,7 @@ _Libraries and tools for templating and lexing._
 
 _Libraries for testing codebases and generating test data._
 
-- Testing Frameworks
+### Testing Frameworks
 
 - [apitest](https://apitest.dev) - Simple and extensible behavioural testing library for REST based services or HTTP handlers that supports mocking external http calls and rendering of sequence diagrams.
 - [assert](https://github.com/go-playground/assert) - Basic Assertion Library used along side native go testing, with building blocks for custom assertions.
@@ -2383,7 +2388,7 @@ _Libraries for testing codebases and generating test data._
 - [Tt](https://github.com/vcaesar/tt) - Simple and colorful test tools.
 - [wstest](https://github.com/posener/wstest) - Websocket client for unit-testing a websocket http.Handler.
 
-- Mock
+### Mock
 
 - [counterfeiter](https://github.com/maxbrunsfeld/counterfeiter) - Tool for generating self-contained mock objects.
 - [genmock](https://gitlab.com/so_literate/genmock) - Go mocking system with code generator for building calls of the interface methods.
@@ -2402,13 +2407,13 @@ _Libraries for testing codebases and generating test data._
 - [timex](https://github.com/cabify/timex) - A test-friendly replacement for the native `time` package.
 - [xgo](https://github.com/xhd2015/xgo) - A general pureposed function mocking library.
 
-- Fuzzing and delta-debugging/reducing/shrinking.
+## Fuzzing and delta-debugging/reducing/shrinking
 
 - [go-fuzz](https://github.com/dvyukov/go-fuzz) - Randomized testing system.
 - [gofuzz](https://github.com/google/gofuzz) - Library for populating go objects with random values.
 - [Tavor](https://github.com/zimmski/tavor) - Generic fuzzing and delta-debugging framework.
 
-- Selenium and browser control tools.
+## Selenium and browser control tools
 
 - [cdp](https://github.com/mafredri/cdp) - Type-safe bindings for the Chrome Debugging Protocol that can be used with browsers or other debug targets that implement it.
 - [chromedp](https://github.com/knq/chromedp) - a way to drive/test Chrome, Safari, Edge, Android Webviews, and other browsers supporting the Chrome Debugging Protocol.
@@ -2417,7 +2422,7 @@ _Libraries for testing codebases and generating test data._
 - [rod](https://github.com/go-rod/rod) - A Devtools driver to make web automation and scraping easy.
 - [selenoid](https://github.com/aerokube/selenoid) - alternative Selenium hub server that launches browsers within containers.
 
-- Fail injection
+### Fail injection
 - [failpoint](https://github.com/pingcap/failpoint) - An implementation of [failpoints](https://www.freebsd.org/cgi/man.cgi?query=fail) for Golang.
 
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