v0.13.4 api update for deployment

internal/server/webserver/server_test.go

@@ -2,7 +2,9 @@ package webserver
 
 import (
 	"io/fs"
+	"strings"
 	"testing"
+	"testing/fstest"
 )
 
 func TestEmbeddedWebClientRoot(t *testing.T) {
@@ -20,3 +22,37 @@ func TestEmbeddedWebClientRoot(t *testing.T) {
 		}
 	}
 }
+
+func TestIndexHTMLSetsAPIBase(t *testing.T) {
+	content, err := fs.Sub(webFS, "chess-client-web")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for apiURL, want := range map[string]string{
+		"http://localhost:8080":     `<script src="app.js" data-api="http://localhost:8080">`,
+		`https://x.test/?a=1&b="2"`: `<script src="app.js" data-api="https://x.test/?a=1&amp;b=&#34;2&#34;">`,
+	} {
+		page, err := indexHTML(content, apiURL)
+		if err != nil {
+			t.Fatalf("%s: %v", apiURL, err)
+		}
+		if n := strings.Count(string(page), want); n != 1 {
+			t.Errorf("%s: index.html has %s %d times, want once", apiURL, want, n)
+		}
+		if strings.Contains(string(page), boardScript) {
+			t.Errorf("%s: index.html still loads the board without data-api", apiURL)
+		}
+	}
+}
+
+func TestIndexHTMLRefusesChangedScript(t *testing.T) {
+	for name, page := range map[string]string{
+		"absent": `<script src="./app.js"></script>`,
+		"twice":  `<script src="app.js"></script><script src="app.js"></script>`,
+	} {
+		content := fstest.MapFS{"index.html": {Data: []byte(page)}}
+		if _, err := indexHTML(content, "http://localhost:8080"); err == nil {
+			t.Errorf("%s: no error", name)
+		}
+	}
+}