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Testing Stack Trace Utility Functions in Cat Framework

This test suite focuses on validating core stack trace and function name utilities in the Cat monitoring framework. It verifies accurate function name resolution and path trimming functionality essential for error tracking and monitoring.

Test Coverage Overview

The test suite provides comprehensive coverage of two critical utilities: function name resolution and path trimming.

Key areas tested include:

Function name extraction from program counters
Stack trace navigation
Path normalization for file locations
Edge cases in stack frame access

Implementation Analysis

The testing approach employs Go’s native testing framework with runtime introspection capabilities. It uses runtime.Caller() to access stack frames and verify function name resolution accuracy.

Testing patterns include:

Iterative stack frame validation
Direct runtime caller verification
Path string manipulation testing
Error condition handling

Technical Details

Testing tools and components:

Go testing package (testing)
Runtime package for stack inspection
Program counter validation
Stack frame navigation utilities
Path string manipulation functions

Best Practices Demonstrated

The test suite exemplifies robust testing practices for system-level utilities. It demonstrates thorough validation of low-level functions with clear error messaging and comprehensive edge case coverage.

Notable practices include:

Explicit expected vs actual value comparisons
Systematic stack frame validation
Proper error handling and reporting
Isolated function testing

dianping/cat

lib/go/gocat/trace_test.go

            
package gocat

import (
	"runtime"
	"testing"
)

func Test_functionName(t *testing.T) {
	var skip = 0

	var names = []string{
		"gocat.Test_functionName",
		"testing.tRunner",
		"runtime.goexit",
	}
	for i := skip; ; i++ {
		if pc, _, _, ok := runtime.Caller(i); !ok {
			break
		} else if functionName(pc) != names[i] {
			t.Errorf("incorrect function name: got %s, want %s", functionName(pc), names[i])
		}
	}
}

func Test_trimPath(t *testing.T) {
	var expect = "gocat/trace_test.go"
	if _, filename, _, ok := runtime.Caller(0); !ok {
		t.Errorf("error occurred in reading top of the stack")
	} else if trimPath(filename) != expect {
		t.Errorf("incorrect trimPath result: got %s, want %s", trimPath(filename), expect)
	}
}