fix: tests and improve README

Author: Genert Org

README.md

@@ -1,11 +1,14 @@
 # POP3 Client
 
+[![codecov](https://codecov.io/gh/genert/pop3/branch/master/graph/badge.svg?token=FbkfA6zyZf)](https://codecov.io/gh/genert/pop3)
+
 POP3 Client written in Golang in accordance to [RFC1939](https://www.ietf.org/rfc/rfc1939.txt).
 
 ## Usage
 
 ### Initialize client
-```go
+
+```golang
 // Create a connection to the server
 c, err := pop3.DialTLS("REPLACE_THIS_SERVER_ADDRESS:993")
 if err != nil {
@@ -34,6 +37,7 @@ if err != nil {
 }
 
 log.Println(message.Text)
+log.Println(message.GetHeader("Subject"))
 
 if err := pc.Dele(1); err != nil {
     log.Fatal(err)

assertion_test.go

@@ -22,6 +22,7 @@ func TestIsOK(t *testing.T) {
 	}
 
 	for _, tt := range testCases {
+		var tt = tt
 		t.Run(fmt.Sprintf(`IsOK should return %s for "%s" message`, strconv.FormatBool(tt.expectedResult), tt.message), func(t *testing.T) {
 			t.Parallel()
 			assert.Equal(t, tt.expectedResult, pop3.IsOK(tt.message))
@@ -41,6 +42,7 @@ func TestIsErr(t *testing.T) {
 	}
 
 	for _, tt := range testCases {
+		var tt = tt
 		t.Run(fmt.Sprintf(`IsErr should return %s for "%s" message`, strconv.FormatBool(tt.expectedResult), tt.message), func(t *testing.T) {
 			t.Parallel()
 			assert.Equal(t, tt.expectedResult, pop3.IsErr(tt.message))

connection_test.go

@@ -26,6 +26,8 @@ func TestConnection_Cmd(t *testing.T) {
 	}
 
 	for _, tt := range testCases {
+		var tt = tt
+
 		var buffer []byte
 		buffer = make([]byte, 0)
 		var fake readWriteFaker
@@ -42,3 +44,16 @@ func TestConnection_Cmd(t *testing.T) {
 		assert.Equal(t, fmt.Sprintf("%s\r\n", tt.command), string(buffer))
 	}
 }
+
+func TestConnection_Close(t *testing.T) {
+	var buffer []byte
+	buffer = make([]byte, 0)
+	var fake readWriteFaker
+	fake.Reader = strings.NewReader("+OK\r\n")
+	fake.Writer = &fakeWriter{buffer: &buffer}
+	fake.Closer = &fakeCloser{}
+
+	connection := pop3.NewConnection(fake)
+
+	assert.Nil(t, connection.Close())
+}

go.sum

@@ -2,28 +2,17 @@ github.com/cention-sany/utf7 v0.0.0-20170124080048-26cad61bd60a h1:MISbI8sU/PSK/
 github.com/cention-sany/utf7 v0.0.0-20170124080048-26cad61bd60a/go.mod h1:2GxOXOlEPAMFPfp014mK1SWq8G8BN8o7/dfYqJrVGn8=
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-github.com/go-test/deep v1.0.2 h1:onZX1rnHT3Wv6cqNgYyFOOlgVKJrksuCMCRvJStbMYw=
-github.com/go-test/deep v1.0.2/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
+github.com/go-test/deep v1.0.7 h1:/VSMRlnY/JSyqxQUzQLKVMAskpY/NZKFA5j2P+0pP2M=
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 github.com/mattn/go-runewidth v0.0.12 h1:Y41i/hVW3Pgwr8gV+J23B9YEY0zxjptBuCWEaxmAOow=
 github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
-github.com/olekukonko/tablewriter v0.0.1 h1:b3iUnf1v+ppJiOfNX4yxxqfWKMQPZR5yoh8urCTFX88=
-github.com/olekukonko/tablewriter v0.0.1/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
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@@ -33,25 +22,16 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
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