Atlas helps Fiber developers in 2026 transform overwhelming `go test (app.Test)` output into a clear, prioritized list of distinct root causes, leveraging its `bash`, `grep`, and `todowrite` tools to efficiently manage test failures and ensure robust `app.Group` routes.
How do I run my Fiber test suite with Atlas and capture all output?
In 2026, running your comprehensive Fiber test suite with Atlas ensures no failure goes unnoticed, even when `go test (app.Test)` produces thousands of lines of output. Atlas's `bash` tool executes `go test ./...` with a generous timeout, capturing the complete log to a file, preventing truncation of critical details.
Atlas's `bash` tool is your gateway to executing your entire Fiber test suite. When you instruct Atlas to run `go test ./...`, it ensures the command is executed with a generous timeout in milliseconds, preventing slow suites from being prematurely killed. Crucially, while the terminal output might be truncated at 2000 lines or 50 KB for readability, Atlas always writes the complete `go test` log to a retained file. This file's path is provided in the output, allowing you to access the full, unadulterated test results for your `app.Test()` handlers and middleware, which is essential for thorough triage in any Fiber project requiring `github.com/gofiber/fiber/v3`.
How do I group Fiber test failures by root cause, not just test name?
After running your Fiber test suite, Atlas helps you move beyond individual test failures to identify distinct root causes, a crucial step for efficient debugging in 2026. Instead of sifting through hundreds of `go test` output lines, Atlas directs you to use `grep` on the complete, saved log file to find common error patterns.
Triage in Fiber applications becomes significantly more efficient when you focus on distinct root causes rather than individual failing test names. A single underlying bug, such as an incorrect `fasthttp` buffer lifetime management or a misconfigured database connection, might cause dozens of `app.Test()` failures. Atlas's `grep` tool, used on the complete log file saved from the `bash` command, allows you to search for specific error messages or stack trace patterns. For instance, you might `grep` for `fasthttp: invalid buffer access` or `sql: no rows in result set` to identify common issues across multiple `fiber.Ctx` handlers, providing a more actionable starting point for fixes than simply seeing `TestUserCreationFailure` and `TestOrderProcessingError`.
How do I track distinct Fiber test failure root causes with Atlas?
To ensure every distinct root cause identified in your Fiber test suite is addressed, Atlas provides the `todowrite` tool, allowing you to create a prioritized list of fixes. This prevents forgetting issues and streamlines your debugging workflow, especially when dealing with 5 or more unique failure patterns from `go test`.
Once you have used `grep` to identify distinct root causes in your Fiber test log, Atlas's `todowrite` tool helps you manage these findings effectively. Instead of trying to remember all the issues, you create a `todowrite` entry for each unique root cause. For example, if you find a recurring `fasthttp` buffer issue affecting several `fiber.Ctx` handlers, you create one `todowrite` entry like 'Fix fasthttp buffer reuse in user and product handlers' and set its status to 'pending'. This approach ensures that each fundamental problem is tracked and addressed, preventing issues from being overlooked in complex Fiber applications with many `app.Group` routes and middleware.
How does Atlas help me fix Fiber test failures iteratively and safely?
Atlas facilitates an iterative and safe approach to fixing Fiber test failures, allowing you to address one root cause at a time and re-run only the affected `go test` cases. With its `edit` tool and unified diff review, you maintain full control over changes to your `app.Group` routes and `fiber.Ctx` handlers, ensuring code quality in 2026.
Atlas supports a focused, iterative workflow for resolving Fiber test failures. After identifying a distinct root cause and creating a `todowrite` entry, you use the `edit` tool to open the relevant Fiber source files, such as `handlers/user.go` or `middleware/auth.go`. Once you've made your changes, you can re-run only the affected tests using `atlas bash "go test ./<package> -run <TestNamePattern>"`. This rapid feedback loop is crucial for debugging. Before any changes are written to disk, Atlas computes a unified diff and surfaces it for your approval, ensuring you have full control. Atlas also automatically runs `gofmt` on touched files, maintaining your Fiber project's code style. For `fasthttp` specific issues, Atlas can even assist in copying `ctx` values if they are retained past the handler, mitigating common buffer reuse pitfalls.
How does Atlas understand my Fiber application's code and context?
Atlas deeply understands your Fiber application's structure in 2026, leveraging its AST-based indexing and Model Context Protocol to interpret `app.Group` routes, `fiber.Ctx` handlers, and middleware. This allows Atlas to provide highly relevant assistance, from suggesting fixes for `fasthttp` buffer issues to ensuring `go.mod` dependencies are correctly managed.
Atlas is not just a generic coding agent; it's specifically designed to understand the nuances of your Fiber codebase. It builds its code index using AST declarations via tree-sitter, rather than blind line windows, giving it a precise understanding of your `app.Group` routes, `fiber.Ctx` handlers, and the middleware you register before `Listen`. This deep contextual awareness means Atlas can offer targeted advice and fixes for Fiber-specific challenges, such as the `fasthttp` buffer reuse problem. It also reads your `go.mod` file, understanding your project's dependencies, including `github.com/gofiber/fiber/v3`. This comprehensive understanding ensures that Atlas's suggestions and actions are always relevant and accurate for your Fiber development workflow.
Step by step
- 01Run your full Fiber test suite using `atlas bash "go test ./... -timeout 5m"` to capture all output, even if it's extensive.
- 02If the terminal output was truncated, use `atlas read /path/to/full_log.txt` to view the complete `go test` log file provided by Atlas.
- 03Employ `atlas grep "<error_pattern>" /path/to/full_log.txt` to identify distinct root causes across your Fiber test failures, rather than focusing on individual `app.Test` names.
- 04For each unique root cause found, create a tracking entry with `atlas todowrite "Fix <distinct_fiber_issue>" --status pending`.
- 05Use `atlas edit <fiber_file.go>` to open the relevant Fiber source file (e.g., a `fiber.Ctx` handler or middleware) to address the first pending root cause.
- 06After making changes, re-run only the affected Fiber tests using `atlas bash "go test ./<package> -run <TestNamePattern>"` for quick feedback.
- 07Review the unified diff presented by Atlas for your changes to `app.Group` routes or `fiber.Ctx` handlers, ensuring accuracy and intent.
- 08Approve the diff to allow Atlas to write the changes and automatically run `gofmt` on the touched Fiber files.
- 09Repeat steps 5-8 for all remaining `todowrite` entries until all distinct Fiber test failures are resolved.
Frequently asked questions
- How does Atlas handle `go test` output that's too long for the terminal in Fiber?
- Atlas's `bash` tool truncates terminal output at 2000 lines or 50 KB but always writes the complete `go test (app.Test)` log to a retained file, providing its path for full review of your Fiber suite.
- Can Atlas help me debug `fasthttp` buffer reuse issues in Fiber?
- Yes, Atlas is configured to understand `fasthttp` buffer lifetimes in Fiber. You can ask Atlas to copy any `fiber.Ctx` value you retain past a handler to prevent unexpected data corruption.
- What specific Fiber commands does Atlas use for testing?
- Atlas uses the standard `go test ./...` command to run your Fiber test suite and can target specific tests with `go test ./<package> -run <TestName>` for iterative fixes on your `app.Test` handlers.
- How does Atlas ensure my Fiber code changes are safe?
- Atlas operates with a read-only plan agent, requires permission for tool calls, and presents a unified diff for every file edit for your approval before writing, then runs `gofmt` on your Fiber code.
- Does Atlas understand my Fiber application's routes and middleware?
- Yes, Atlas builds its code index by AST declarations, allowing it to understand your `app.Group` routes, `fiber.Ctx` handlers, and registered middleware for context-aware assistance in your Fiber project.
- How do I manage `go mod` dependencies with Atlas in my Fiber project?
- Atlas can read your `go.mod` file and is aware of dependencies like `github.com/gofiber/fiber/v3`, helping you manage your Fiber project's module requirements and ensuring consistency.
- Can Atlas help me format my Fiber code?
- Yes, after making edits, Atlas will automatically run `gofmt` on any touched files in your Fiber project, ensuring consistent code style across your `app.Group` routes and `fiber.Ctx` handlers.
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