feat: parser automático de test files Go/Python/Bash

Extrae test cases individuales con su código desde archivos _test. Go detecta func TestXxx, Python detecta def test_xxx, Bash soporta tres convenciones: test_xxx(){}, secciones === nombre ===, y comentarios # Test:.

registry/test_parser.go

@@ -0,0 +1,133 @@
+package registry
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+)
+
+// testCase represents a single test extracted from a test file.
+type testCase struct {
+	Name string
+	Code string
+}
+
+// testPos marks the start of a test within a file.
+type testPos struct {
+	name      string
+	startLine int
+}
+
+// parseTestFile reads a test file and extracts individual test cases.
+// Supports Go, Python, and Bash test formats.
+func parseTestFile(path, lang string) ([]testCase, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading test file %s: %w", path, err)
+	}
+	content := string(data)
+
+	switch lang {
+	case "go":
+		return parseGoTests(content), nil
+	case "py":
+		return parsePythonTests(content), nil
+	case "bash":
+		return parseBashTests(content), nil
+	default:
+		return nil, nil
+	}
+}
+
+// parseGoTests extracts Go test functions (func TestXxx).
+var goTestFuncRe = regexp.MustCompile(`(?m)^func\s+(Test\w+)\s*\(`)
+
+func parseGoTests(content string) []testCase {
+	lines := strings.Split(content, "\n")
+	var positions []testPos
+
+	for i, line := range lines {
+		if m := goTestFuncRe.FindStringSubmatch(line); m != nil {
+			positions = append(positions, testPos{name: m[1], startLine: i})
+		}
+	}
+
+	return extractBlocks(lines, positions)
+}
+
+// parsePythonTests extracts Python test functions (def test_xxx).
+var pyTestFuncRe = regexp.MustCompile(`(?m)^def\s+(test_\w+)\s*\(`)
+
+func parsePythonTests(content string) []testCase {
+	lines := strings.Split(content, "\n")
+	var positions []testPos
+
+	for i, line := range lines {
+		if m := pyTestFuncRe.FindStringSubmatch(line); m != nil {
+			positions = append(positions, testPos{name: m[1], startLine: i})
+		}
+	}
+
+	return extractBlocks(lines, positions)
+}
+
+// parseBashTests extracts Bash test blocks.
+// Tries three conventions in order:
+//  1. test_xxx() { ... } — function-based tests
+//  2. === section === — section headers (echo "=== name ===")
+//  3. # Test: ... — comment-based test blocks
+var bashTestFuncRe = regexp.MustCompile(`(?m)^(test_\w+)\s*\(\)\s*\{`)
+var bashTestCommentRe = regexp.MustCompile(`(?m)^#\s*[Tt]est:\s*(.+)`)
+var bashSectionRe = regexp.MustCompile(`(?i)^(?:echo\s+["'])?===\s*(\w[\w\s]*\w)\s*===["']?\s*$`)
+
+func parseBashTests(content string) []testCase {
+	lines := strings.Split(content, "\n")
+
+	// Strategy 1: test_xxx() { ... }
+	var positions []testPos
+	for i, line := range lines {
+		if m := bashTestFuncRe.FindStringSubmatch(line); m != nil {
+			positions = append(positions, testPos{name: m[1], startLine: i})
+		}
+	}
+	if len(positions) > 0 {
+		return extractBlocks(lines, positions)
+	}
+
+	// Strategy 2: === section === headers
+	for i, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if m := bashSectionRe.FindStringSubmatch(trimmed); m != nil {
+			positions = append(positions, testPos{name: m[1], startLine: i})
+		}
+	}
+	if len(positions) > 0 {
+		return extractBlocks(lines, positions)
+	}
+
+	// Strategy 3: # Test: ... comments
+	for i, line := range lines {
+		if m := bashTestCommentRe.FindStringSubmatch(line); m != nil {
+			positions = append(positions, testPos{name: strings.TrimSpace(m[1]), startLine: i})
+		}
+	}
+	return extractBlocks(lines, positions)
+}
+
+// extractBlocks splits lines into code blocks based on test positions.
+func extractBlocks(lines []string, positions []testPos) []testCase {
+	var tests []testCase
+	for i, pos := range positions {
+		endLine := len(lines)
+		if i+1 < len(positions) {
+			endLine = positions[i+1].startLine
+		}
+		for endLine > pos.startLine && strings.TrimSpace(lines[endLine-1]) == "" {
+			endLine--
+		}
+		code := strings.Join(lines[pos.startLine:endLine], "\n")
+		tests = append(tests, testCase{Name: pos.name, Code: code})
+	}
+	return tests
+}