Add internal engine relocation candidate

internal/engine/path_fuzz_test.go

@@ -0,0 +1,27 @@
+package engine
+
+import "testing"
+
+func FuzzParsePath(f *testing.F) {
+	for _, seed := range []string{"", "/", "/service/port", "/a~1b/~0key", "/0", "relative", "/bad~2escape"} {
+		f.Add(seed)
+	}
+
+	f.Fuzz(func(t *testing.T, input string) {
+		if len(input) > 4096 {
+			return
+		}
+		path, err := ParsePath(input)
+		if err != nil {
+			return
+		}
+		canonical := path.String()
+		reparsed, err := ParsePath(canonical)
+		if err != nil {
+			t.Fatalf("canonical path %q did not parse: %v", canonical, err)
+		}
+		if reparsed.String() != canonical {
+			t.Fatalf("path round trip = %q, want %q", reparsed.String(), canonical)
+		}
+	})
+}