Fix run_test.sh

Author: hoodmane

Platforms/emscripten/browser_test/run_test.sh

@@ -2,10 +2,12 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 rm -f test_log.txt
-echo "Installing node packages" | tee test_log.txt
+echo "Installing node packages" | tee -a test_log.txt
 npm ci >> test_log.txt 2>&1
-echo "Installing playwright browsers" | tee test_log.txt
+echo "Installing playwright browsers" | tee -a test_log.txt
 npx playwright install 2>> test_log.txt
-export PORT=$(npx get-port-cli)
-echo "Running tests with webserver on port $PORT" | tee test_log.txt
-CI=1 npx playwright test | tee test_log.txt
+# Disable color so FORCE_COLOR=1 (set in CI) doesn't wrap the port number in
+# ANSI escape codes, which would produce an invalid baseURL in Playwright.
+export PORT=$(FORCE_COLOR=0 npx get-port-cli)
+echo "Running tests with webserver on port $PORT" | tee -a test_log.txt
+CI=1 npx playwright test | tee -a test_log.txt