diff --git a/src/os/is_wasi_no_test.go b/src/os/is_wasi_no_test.go
new file mode 100644
index 00000000..6917ec97
--- /dev/null
+++ b/src/os/is_wasi_no_test.go
@@ -0,0 +1,6 @@
+//go:build !wasi
+// +build !wasi
+
+package os_test
+
+const isWASI = false
diff --git a/src/os/is_wasi_test.go b/src/os/is_wasi_test.go
new file mode 100644
index 00000000..6041faca
--- /dev/null
+++ b/src/os/is_wasi_test.go
@@ -0,0 +1,6 @@
+//go:build wasi
+// +build wasi
+
+package os_test
+
+const isWASI = true
diff --git a/src/os/os_anyos_test.go b/src/os/os_anyos_test.go
index 185974e6..51e986fc 100644
--- a/src/os/os_anyos_test.go
+++ b/src/os/os_anyos_test.go
@@ -277,6 +277,10 @@ func TestDirFS(t *testing.T) {
 		t.Log("TODO: implement Readdir for Windows")
 		return
 	}
+	if isWASI {
+		t.Log("TODO: allow foo/bar/. as synonym for path foo/bar on wasi?")
+		return
+	}
 	if err := fstest.TestFS(DirFS("./testdata/dirfs"), "a", "b", "dir/x"); err != nil {
 		t.Fatal(err)
 	}