Removed Go 1.21 and added Go 1.19 in the codecov.yml file to ensure compatibility with older projects and streamline the CI process. This helps in maintaining backward compatibility and avoids potential issues with unsupported Go versions.
Removed unnecessary comments that were clarifying the purpose of sleep statements in the test cases. This makes the code cleaner and easier to maintain by reducing clutter.
Replaced `err == io.EOF` with `errors.Is(err, io.EOF)` for better error comparison. Removed redundant `break` statements to streamline case logic and improve code readability.
This test checks the client's ability to handle SMTP reset errors when sending an email. It verifies the correct error type, ensures it is recognized as a permanent error, and confirms the correct message ID handling.
Implemented multiple tests to cover various error scenarios in the SMTP client, including invalid email addresses and data transmission failures. Introduced `failReset` flag in `simpleSMTPServer` to simulate server reset failures.
Introduced `TestClient_SendErrorNoEncoding` to verify client behavior when sending a message without encoding. Adjusted server connection handling for better error reporting and connection closure, replacing abrupt exits with returns where appropriate.
Implement MessageID and Msg methods in SendError to allow retrieval of the message ID and the affected message, respectively. These methods handle cases where the error or the message is nil, returning an empty string or nil as appropriate.
Implemented a simple SMTP test server to facilitate unit testing. This server listens on a specified address and port, accepts connections, and processes common SMTP commands like HELO, MAIL FROM, RCPT TO, DATA, and QUIT. Several constants related to the server configuration were also added to the test file.
Reformat the construction of SendError objects for better readability. This improves the clarity and maintainability of the error handling code within the client.go file.
This commit introduces a new test case to verify the behavior of the IsTemp method when called on a nil SendError instance. It ensures that the method returns false as expected, improving test coverage for edge cases.
Replaced `getTestConnection` with `getTestConnectionNoTestPort` for tests that skip port configuration, improving connection setup flexibility. Added environment variable support for setting ports in `getTestClient` to streamline port configuration in tests.
Include the affected message ID in the error message to provide more context for debugging. This change ensures that each error log contains essential information about the specific message associated with the error.
Included the affected message in the SendError struct for better error tracking and debugging. This enhancement ensures that any errors encountered during the sending process can be directly associated with the specific message that caused them.
Consolidated the message sending logic into a single `sendSingleMsg` function to reduce duplication and improve code maintainability. This change simplifies the `Send` method in multiple Go version files by removing redundant code and calling the new helper function instead.
Renamed the variable 'failed' to 'hasError' to better reflect its purpose and improve code readability. This change helps in understanding that the variable indicates the presence of an error rather than a generic failure.
Changed from range over messages to range with index to correctly update sendError field in the original messages slice. This prevents shadowing issues and ensures proper error logging for each message.
Extracted message sending functionality into a new helper function `sendSingleMsg`. This improves the code readability and maintainability by reducing the complexity of the main loop and encapsulating error handling per message.
