test: add dedicated status porcelain line parser with coverage

src/shared/git-worktree/parse-status-porcelain-line.ts

@@ -0,0 +1,27 @@
+import type { GitFileStatus } from "./types"
+
+export interface ParsedGitStatusPorcelainLine {
+	filePath: string
+	status: GitFileStatus
+}
+
+function toGitFileStatus(statusToken: string): GitFileStatus {
+	if (statusToken === "A" || statusToken === "??") return "added"
+	if (statusToken === "D") return "deleted"
+	return "modified"
+}
+
+export function parseGitStatusPorcelainLine(
+	line: string,
+): ParsedGitStatusPorcelainLine | null {
+	if (!line) return null
+
+	const statusToken = line.substring(0, 2).trim()
+	const filePath = line.substring(3)
+	if (!filePath) return null
+
+	return {
+		filePath,
+		status: toGitFileStatus(statusToken),
+	}
+}