feat: testdir resolution

internal/miro/testdir.go

@@ -0,0 +1,86 @@
+package miro
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	miroconfig "miro/internal/config"
+)
+
+var fallbackTestDirs = []string{
+	"e2e",
+	filepath.Join("test", "e2e"),
+	filepath.Join("tests", "e2e"),
+	"miro",
+	filepath.Join("test", "miro"),
+	filepath.Join("tests", "miro"),
+}
+
+// ResolveTestDir resolves the project test directory from config or conventions.
+func ResolveTestDir() (string, error) {
+	cwd, err := os.Getwd()
+	if err != nil {
+		return "", fmt.Errorf("failed to get working directory: %v", err)
+	}
+
+	root := projectRoot(cwd)
+	return resolveTestDirFromRoot(root)
+}
+
+func resolveTestDirFromRoot(root string) (string, error) {
+	candidates, err := testDirCandidates(root)
+	if err != nil {
+		return "", err
+	}
+
+	for _, candidate := range candidates {
+		info, err := os.Stat(candidate)
+		if err == nil && info.IsDir() {
+			return candidate, nil
+		}
+		if err != nil && !errors.Is(err, os.ErrNotExist) {
+			return "", fmt.Errorf("failed to check test directory %s: %v", candidate, err)
+		}
+	}
+
+	return "", errors.New("test_dir not configured and none of the expected test directories exist")
+}
+
+// returns the git root if in a git repo else current pwd
+func projectRoot(cwd string) string {
+	out, err := exec.Command("git", "rev-parse", "--show-toplevel").CombinedOutput()
+	if err != nil {
+		return cwd
+	}
+
+	root := strings.TrimSpace(string(out))
+	if root == "" {
+		return cwd
+	}
+	return filepath.Clean(root)
+}
+
+// list of e2e test directory candidates. uses from config if it exists
+// else uses fallback paths
+func testDirCandidates(root string) ([]string, error) {
+	configPath := filepath.Join(root, "miro.toml")
+
+	cfg, err := miroconfig.ReadConfig(configPath)
+	if err == nil && cfg.TestDir != "" {
+		return []string{filepath.Join(root, cfg.TestDir)}, nil
+	}
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		return nil, err
+	}
+
+	candidates := make([]string, 0, len(fallbackTestDirs))
+	for _, candidate := range fallbackTestDirs {
+		candidates = append(candidates, filepath.Join(root, candidate))
+	}
+
+	return candidates, nil
+}