LGTM

🔍 Code Review Summary

The review focused on adding stdin support to the evm blocktest command, aligning its functionality with statetest for improved batch processing. The implementation is straightforward and achieves its goal. The primary risk identified is code duplication and a minor behavioral inconsistency, for which a clear refactoring suggestion is provided to create a unified file collection utility. Overall, the change is a valuable, low-risk enhancement to the developer toolkit.

📋 Reviewed Changes

• cmd/evm/blockrunner.go: Modified to read test file paths from stdin when no command-line arguments are provided.
• cmd/evm/main.go: Contains existing utility functions like collectFiles which are related to the new logic.
• tests/block_test_util.go: Test utilities, reviewed for context and potential impact from the changes.

📊 Architecture & Flow Diagrams

Diagram 1

graph TD
    A["evm blocktest"] --> B{"Args provided"}
    B -->|Yes| C["Read paths from args"]
    B -->|No| D["Read paths from stdin"]
    C --> E["Expand directories  collect files"]
    D --> E
    E --> F["Run tests on file paths"]

🤔 Review Quality Assessment

The review demonstrates comprehensive coverage, correctly identifying code duplication and the opportunity for a shared utility. The synthesis process refined this insight into a more holistic and actionable recommendation that includes refactoring statetest for consistency and addresses subtle behavioral differences. Confidence in the final, consolidated suggestions is high, as they significantly improve the long-term maintainability and robustness of the CLI tool.

💡 Suggestions Summary

• Inline Comments: 0 suggestions on modified code lines
• General Suggestions: 2 suggestions for overall improvements

📝 Additional Suggestions

The following suggestions apply to code outside the current PR diff:

1. 🔴 To improve maintainability and ensure consistent behavior across commands, refactor the file path collection logic into a shared utility function in cmd/evm/main.go. This new function, collectPathsFromInput, should handle reading from both command-line arguments and stdin, and also manage directory expansion for all inputs. This eliminates code duplication between blocktest and statetest and ensures consistent behavior.

File: cmd/evm/main.go (Line 360)
Confidence: 95%

// collectPathsFromInput reads paths from command-line arguments or stdin and expands them.
func collectPathsFromInput(ctx *cli.Context) []string {
	var paths []string
	if ctx.NArg() == 0 {
		// Read from stdin if no arguments are provided.
		scanner := bufio.NewScanner(os.Stdin)
		for scanner.Scan() {
			paths = append(paths, scanner.Text())
		}
	} else {
		// Read from command-line arguments.
		paths = ctx.Args().Slice()
	}

	// Expand all paths, whether from stdin or args, to discover test files.
	var expandedPaths []string
	for _, path := range paths {
		expandedPaths = append(expandedPaths, collectFiles(path)...)
	}
	return expandedPaths
}

2. 🔴 Update blockTestCmd to use the new collectPathsFromInput helper function. This simplifies the command's implementation, removes the duplicated logic, and ensures it benefits from the centralized, consistent method for discovering test files.

File: cmd/evm/blockrunner.go (Line 158)
Confidence: 95%

		paths := collectPathsFromInput(ctx)
		if len(paths) == 0 {
			return errors.New("no test files found")
		}