Adding test to main

.editorconfig

@@ -9,4 +9,8 @@ end_of_line = lf
 insert_final_newline = true
 charset = utf-8
 indent_style = tab
-indent_size = 2
+indent_size = 2
+
+[{*.yml, *.yaml}]
+indent_style = space
+indent_size = 2

.travis.yml

@@ -1,21 +1,22 @@
+---
 language: go
 sudo: false
 dist: trusty
 go:
-  - 1.13.x
+ - 1.13.x
 script:
-  - make clean binary
-  - sonar-scanner
+ - make clean binary
+ - sonar-scanner
 branches:
   only:
-  - master
-  - develop
-  - "/^v\\d/"
+   - master
+   - develop
+   - "/^v\\d/"
 notifications:
   email: onchange
 addons:
   sonarcloud:
     organization: "wavesoftware"
     token:
-			secure: "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"
+      secure: "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"
 

cmd/installer/main.go

@@ -6,6 +6,10 @@ import (
 	"github.com/wavesoftware/serverless-installer/internal/cli"
 )
 
+var exit func(int) = func(exitcode int) {
+	os.Exit(exitcode)
+}
+
 func main() {
-	os.Exit(cli.NewRunner().Run())
+	exit(cli.NewRunner().Run())
 }

cmd/installer/main_test.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMain(t *testing.T) {
+	// given
+	oldExit := exit
+	oldArgs := os.Args
+	defer func() {
+		exit = oldExit
+		os.Args = oldArgs
+	}()
+	exitcode := ^int(0)
+	exit = func(received int) {
+		exitcode = received
+	}
+	os.Args = []string{"cmd", "--help"}
+
+	// when
+	main()
+
+	assert.Equal(t, 0, exitcode)
+}