@julieqiu I would like to work on this issue. can I pick this?

Please do!

@julieqiu I have gone through TestServer test from server_test.go file. I am thinking to write the test cases for latestVersion in similar way.

1. testCases := []serverTestCase{
		{
			name:           "module packages tab latest version",
			urlPath:        fmt.Sprintf("/mod/%s?tab=packages", sample.ModulePath),
			wantStatusCode: http.StatusOK,
			// Fall back to the latest version.
			want: in("",
				in("div.DetailsHeader-version", text("v1.0.0"))),
		},
	}

2. insertTestModules()
3. create a server i.e s = NewServer()
4. create a middeware middleware.LatestVersion(s.LatestVersion) as s.LatestVersion is intended to be a parameter of middleware.LatestVersion
5. call latestVersion method i.e s.latestVersion(context.Background(), packagePath, modulePath, pageType)

6. for _, tc := range testCases {
		a. create a httptest.NewRecorder()
		b. create a new httptest request to the urlPath
		c. parse the res.Body
		d. here in res.Body we can check compare the `requested` and `want` version
	}

Before moving forward with this solution, can you please let me know that is this the right approach?

Hi @julieqiu, Can I pickup this issue? If, @vikramcse is okay with it?

Change https://golang.org/cl/278752 mentions this issue: internal/frontend: added tests for frontend.LatestVersion