Update testing guide (#352)

Signed-off-by: Taras Drozdovskyi <t.drozdovsky@samsung.com>

Adds instructions on how to install the gocov package and staticckeck tool for testing the project.
Fixes #350

docs/platforms/x86_64_linux/x86_64_linux.md

@@ -45,7 +45,21 @@ Please see the below [How to work](#how-to-work) to know how to run Edge Orchest
 `$ export GOPATH=$HOME/go`  
 `$ export PATH=$PATH:$GOPATH/bin`
 
-- extra linux utilities
+- extra Go utilities: (optional)
+  - [gocov](https://pkg.go.dev/github.com/axw/gocov)
+  ```
+  $ go get github.com/axw/gocov/gocov
+  ```
+   - [gocov-html](https://github.com/matm/gocov-html#gocov-html-export)
+  ```
+  $ go get github.com/matm/gocov-html
+  ```
+  - [staticcheck](https://staticcheck.io)
+  ```
+  $ go install honnef.co/go/tools/cmd/staticcheck@latest
+  ```
+
+- extra linux utilities:
 ```
 $ sudo apt-get install tree jq
 ```

docs/testing_policy.md

@@ -2,7 +2,7 @@
 ## Contents
 1. [Introduction](#1-introduction)
 2. [How to start Test Suite (Local)](#2-how-to-start-test-suite-local)  
-    2.1 [Using the system build script](#21-using-the-system-build-script)  
+    2.1 [Using the makefile](#21-using-the-makefile)  
     2.2 [Using standard Go language facilities](#22-using-standard-go-language-facilities)  
 3. [Automated Run Test Suite (Remote)](#3-automated-run-test-suite-remote)  
 
@@ -22,8 +22,10 @@ The Edge Orchestration team strongly recommends adhering to the [Test-driven dev
 ---
 
 ## 2. How to start Test Suite (Local)
-There are two ways to test:
 
+> Make sure the `gocov` and `gocov-html` packages are installed [(How to install)](https://github.com/matm/gocov-html#installation)
+
+There are two ways to test:
 ### 2.1 Using the makefile
 To start testing all packages:
 ```
@@ -43,7 +45,8 @@ To start testing a specific package:
 ```
 $ go test -v [PKG_NAME]
 ```
-
+
+
 ---
 
 ## 3. Automated Run Test Suite (Remote)

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Microsoft/go-winio v0.4.16 // indirect
 	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
+	github.com/axw/gocov v1.0.0 // indirect
 	github.com/casbin/casbin v1.9.1
 	github.com/containerd/containerd v1.4.1-0.20201117152358-0edc412565dc // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
@@ -28,6 +29,7 @@ require (
 	github.com/grandcat/zeroconf v1.0.0
 	github.com/imdario/mergo v0.3.11 // indirect
 	github.com/leemcloughlin/logfile v0.0.0-20201123203928-cff1c8a30a10
+	github.com/matm/gocov-html v0.0.0-20200509184451-71874e2e203b // indirect
 	github.com/mattn/go-shellwords v1.0.10 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect