diff --git a/pkg/cmd/extension/manager_test.go b/pkg/cmd/extension/manager_test.go
index 64a90da3f..9df4ce4b2 100644
--- a/pkg/cmd/extension/manager_test.go
+++ b/pkg/cmd/extension/manager_test.go
@@ -67,7 +67,9 @@ func TestManager_List(t *testing.T) {
 }
 
 func TestManager_List_Binary(t *testing.T) {
+	//tempDir := t.TempDir()
 	// TODO
+
 }
 
 func TestManager_Dispatch(t *testing.T) {
@@ -206,50 +208,19 @@ func TestManager_Upgrade_NoExtensions(t *testing.T) {
 func TestManager_Upgrade_BinaryExtension(t *testing.T) {
 	tempDir := t.TempDir()
 
-	installReg := httpmock.Registry{}
-	defer installReg.Verify(t)
-	installClient := http.Client{Transport: &installReg}
-
 	io, _, _, _ := iostreams.Test()
-	m := newTestManager(tempDir, &installClient, io)
-	repo := ghrepo.NewWithHost("owner", "gh-bin-ext", "example.com")
+	reg := httpmock.Registry{}
+	defer reg.Verify(t)
+	client := http.Client{Transport: &reg}
+	stubBinaryExtension(filepath.Join(tempDir, "extensions", "gh-bin-ext"), binManifest{
+		Owner: "owner",
+		Name:  "gh-bin-ext",
+		Host:  "example.com",
+		Tag:   "v1.0.1",
+	})
 
-	installReg.Register(
-		httpmock.REST("GET", "api/v3/repos/owner/gh-bin-ext/releases/latest"),
-		httpmock.JSONResponse(
-			release{
-				Assets: []releaseAsset{
-					{
-						Name:   "gh-bin-ext-windows-amd64",
-						APIURL: "https://example.com/release/cool",
-					},
-				},
-			}))
-	installReg.Register(
-		httpmock.REST("GET", "api/v3/repos/owner/gh-bin-ext/releases/latest"),
-		httpmock.JSONResponse(
-			release{
-				Tag: "v1.0.1",
-				Assets: []releaseAsset{
-					{
-						Name:   "gh-bin-ext-windows-amd64",
-						APIURL: "https://example.com/release/cool",
-					},
-				},
-			}))
-	installReg.Register(
-		httpmock.REST("GET", "release/cool"),
-		httpmock.StringResponse("FAKE BINARY"))
-
-	err := m.Install(repo)
-	assert.NoError(t, err)
-
-	upgradeReg := httpmock.Registry{}
-	defer upgradeReg.Verify(t)
-	upgradeClient := http.Client{Transport: &upgradeReg}
-
-	um := newTestManager(tempDir, &upgradeClient, io)
-	upgradeReg.Register(
+	m := newTestManager(tempDir, &client, io)
+	reg.Register(
 		httpmock.REST("GET", "api/v3/repos/owner/gh-bin-ext/releases/latest"),
 		httpmock.JSONResponse(
 			release{
@@ -261,7 +232,7 @@ func TestManager_Upgrade_BinaryExtension(t *testing.T) {
 					},
 				},
 			}))
-	upgradeReg.Register(
+	reg.Register(
 		httpmock.REST("GET", "api/v3/repos/owner/gh-bin-ext/releases/latest"),
 		httpmock.JSONResponse(
 			release{
@@ -273,11 +244,11 @@ func TestManager_Upgrade_BinaryExtension(t *testing.T) {
 					},
 				},
 			}))
-	upgradeReg.Register(
+	reg.Register(
 		httpmock.REST("GET", "release/cool2"),
 		httpmock.StringResponse("FAKE UPGRADED BINARY"))
 
-	err = um.Upgrade("bin-ext", false)
+	err := m.Upgrade("bin-ext", false)
 	assert.NoError(t, err)
 
 	manifest, err := os.ReadFile(filepath.Join(tempDir, "extensions/gh-bin-ext", manifestName))
@@ -500,3 +471,10 @@ func stubLocalExtension(tempDir, path string) error {
 	}
 	return f.Close()
 }
+
+func stubBinaryExtension(path string, bm binManifest) error {
+	// TODO make directory
+	// TODO write manifest file
+	// TODO write fake binary file
+	return nil
+}