Refactor and reintegrate content type tests in file_test.go

Reintegrates previously commented out tests for file content types, ensuring they are part of a structured t.Run block. Enhances readability and maintains functionality by checking the presence and correctness of attachments in a more concise manner.

file_test.go

@@ -155,39 +155,34 @@ func TestFile(t *testing.T) {
 			})
 		}
 	})
-}
-
-/*
-
-
-// TestFile_WithFileContentType tests the WithFileContentType option
-func TestFile_WithFileContentType(t *testing.T) {
+	t.Run("WithFileContentType", func(t *testing.T) {
 		tests := []struct {
 			name        string
-		ct   ContentType
-		want string
+			contentType ContentType
 		}{
-		{"File content-type: text/plain", TypeTextPlain, "text/plain"},
-		{"File content-type: html/html", TypeTextHTML, "text/html"},
-		{"File content-type: application/octet-stream", TypeAppOctetStream, "application/octet-stream"},
-		{"File content-type: application/pgp-encrypted", TypePGPEncrypted, "application/pgp-encrypted"},
-		{"File content-type: application/pgp-signature", TypePGPSignature, "application/pgp-signature"},
+			{"File content-type: text/plain", TypeTextPlain},
+			{"File content-type: html/html", TypeTextHTML},
+			{"File content-type: application/octet-stream", TypeAppOctetStream},
+			{"File content-type: application/pgp-encrypted", TypePGPEncrypted},
+			{"File content-type: application/pgp-signature", TypePGPSignature},
 		}
 		for _, tt := range tests {
-		m := NewMsg()
 			t.Run(tt.name, func(t *testing.T) {
-			m.AttachFile("file.go", WithFileContentType(tt.ct))
-			al := m.GetAttachments()
-			if len(al) <= 0 {
-				t.Errorf("AttachFile() failed. Attachment list is empty")
+				message := NewMsg()
+				message.AttachFile("file.go", WithFileContentType(tt.contentType))
+				attachments := message.GetAttachments()
+				if len(attachments) <= 0 {
+					t.Fatalf("failed to retrieve attachments list")
 				}
-			a := al[0]
-			if a.ContentType != ContentType(tt.want) {
-				t.Errorf("WithFileContentType() failed. Expected: %s, got: %s", tt.want, a.ContentType)
+				firstAttachment := attachments[0]
+				if firstAttachment == nil {
+					t.Fatalf("failed to retrieve first attachment, got nil")
+				}
+				if firstAttachment.ContentType != tt.contentType {
+					t.Errorf("WithFileContentType() failed. Expected: %s, got: %s", tt.contentType,
+						firstAttachment.ContentType)
 				}
 			})
 		}
+	})
 }
-
-
-*/

smtp/smtp.go

@@ -554,20 +554,9 @@ func (c *Client) Noop() error {
 
 // Quit sends the QUIT command and closes the connection to the server.
 func (c *Client) Quit() error {
-	// If we already tried to send a EHLO/HELO but it failed, we still need to be able to send
-	// a QUIT to close the connection.
-	// c.hello() will return the global helloErr of the Client, which will always be set if the HELO
-	// failed before. Therefore if we already sent a HELO and the error is not nil, we skip another
-	// EHLO/HELO try
-	c.mutex.RLock()
-	didHello := c.didHello
-	helloErr := c.helloError
-	c.mutex.RUnlock()
-	if !didHello || helloErr == nil {
-		if err := c.hello(); err != nil {
-			return err
-		}
-	}
+	// See https://github.com/golang/go/issues/70011
+	_ = c.hello() // ignore error; we're quitting anyhow
+
 	_, _, err := c.cmd(221, "QUIT")
 	if err != nil {
 		return err

smtp/smtp_test.go

@@ -900,6 +900,35 @@ Goodbye.
 QUIT
 `
 
+func TestHELOFailed(t *testing.T) {
+	serverLines := `502 EH?
+502 EH?
+221 OK
+`
+	clientLines := `EHLO localhost
+HELO localhost
+QUIT
+`
+	server := strings.Join(strings.Split(serverLines, "\n"), "\r\n")
+	client := strings.Join(strings.Split(clientLines, "\n"), "\r\n")
+	var cmdbuf strings.Builder
+	bcmdbuf := bufio.NewWriter(&cmdbuf)
+	var fake faker
+	fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
+	c := &Client{Text: textproto.NewConn(fake), localName: "localhost"}
+	if err := c.Hello("localhost"); err == nil {
+		t.Fatal("expected EHLO to fail")
+	}
+	if err := c.Quit(); err != nil {
+		t.Errorf("QUIT failed: %s", err)
+	}
+	_ = bcmdbuf.Flush()
+	actual := cmdbuf.String()
+	if client != actual {
+		t.Errorf("Got:\n%s\nWant:\n%s", actual, client)
+	}
+}
+
 func TestExtensions(t *testing.T) {
 	fake := func(server string) (c *Client, bcmdbuf *bufio.Writer, cmdbuf *strings.Builder) {
 		server = strings.Join(strings.Split(server, "\n"), "\r\n")