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package e2e
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import (
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"net/http"
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"os/exec"
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"strings"
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"testing"
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// A stylesheet a browser cannot keep is refetched on every click, and the page flashes unstyled.
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func TestTheStylesheetIsKeptBetweenPages(t *testing.T) {
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if _, err := exec.LookPath("git"); err != nil {
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t.Skip("git is not installed")
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in := newInstance(t)
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john := in.account("john")
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seed(t, in, john, "john", "johnbot")
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// Every page asks for the stylesheet under the running version, which is what makes it keepable.
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_, _, body := get(t, in.http.URL+"/john/johnbot")
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i := strings.Index(body, "/static/barerepo.css")
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if i < 0 {
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t.Fatalf("no stylesheet on the page:\n%s", body)
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href := body[i : strings.Index(body[i:], `"`)+i]
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if !strings.Contains(href, "?v=") {
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t.Errorf("the stylesheet url carries no version, so it can only be cached by guessing: %s", href)
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resp, err := http.Get(in.http.URL + href)
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if err != nil {
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t.Fatal(err)
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defer resp.Body.Close()
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cc := resp.Header.Get("Cache-Control")
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if !strings.Contains(cc, "immutable") || !strings.Contains(cc, "max-age=") {
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t.Errorf("the versioned stylesheet answered Cache-Control %q, so a browser refetches it", cc)
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// And a bookmarked url with no version still says something, or that request flashes too.
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plain, err := http.Get(in.http.URL + "/static/barerepo.css")
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if err != nil {
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t.Fatal(err)
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defer plain.Body.Close()
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if plain.Header.Get("Cache-Control") == "" {
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t.Error("an unversioned stylesheet answers with no caching policy at all")
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// A url cached for a year must change when the file does, or an edit reaches nobody who has it.
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func TestTheStylesheetUrlIsNotTheReleaseNumber(t *testing.T) {
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if _, err := exec.LookPath("git"); err != nil {
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t.Skip("git is not installed")
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in := newInstance(t)
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john := in.account("john")
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seed(t, in, john, "john", "johnbot")
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_, _, body := get(t, in.http.URL+"/john/johnbot")
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i := strings.Index(body, "/static/barerepo.css")
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href := body[i : strings.Index(body[i:], `"`)+i]
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_, tag, _ := strings.Cut(href, "?v=")
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// The version does not move between builds, so a stylesheet keyed on it is kept after an edit.
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if tag == "" || strings.Contains(body, "?v=0.1.0") {
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t.Errorf("the stylesheet is cached for a year under %q, which the next edit will not change", tag)
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// Every page agrees, or one of them hands out a url that pins an old stylesheet.
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for _, path := range []string{"/john/johnbot/files", "/john/johnbot/config", "/signin"} {
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_, _, page := get(t, in.http.URL+path)
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if !strings.Contains(page, "?v="+tag) {
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t.Errorf("%s asks for a different stylesheet url than the log page does", path)