Add a script to simplify running the wpt tests locally (#171)

Author: elliottt

tests/wpt-harness/run-wpt.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+# Use this script to run the wpt test harness locally. You'll need to have the
+# following executables in your path:
+#
+# * wizer
+# * node
+#
+# From any directory, run this script and it will do the following:
+#
+# 1. build js-compute-runtime.wasm and move it into the current directory
+# 2. build the wpt runner
+# 3. run the test suite and forward any arguments to it
+#
+# If you'd like to run a debug build, set the `DEBUG` environment variable when
+# running this script:
+#
+# > mkdir my_test
+# > cd my_test
+# > DEBUG=true ../tests/wpt-harness/run-wpt.sh
+#
+# For this to work, you'll need to have run the following command in advance:
+#
+# > cd c-dependencies/spidermonkey
+# > ./download-engine.sh debug
+#
+# If you get an error about missing "jsapi.h" while building the runtime,
+# something's gone wrong with the engine download.
+
+set -euo pipefail
+
+working_dir="$(pwd)"
+root="$(dirname "${BASH_SOURCE[0]}")/../.."
+
+output="$(mktemp)"
+trap 'rm $output' EXIT
+
+echo "Building the runtime..."
+cd "$root/c-dependencies/js-compute-runtime"
+if ! make -j8 > "$output" 2>&1; then
+  cat "$output"
+  exit 1
+fi
+cp js-compute-runtime.wasm "$working_dir"
+
+cd "$working_dir"
+
+echo "Building the wpt runtime..."
+bash "$root/tests/wpt-harness/build-wpt-runtime.sh"
+
+echo "Running the wpt tests..."
+node "$root/tests/wpt-harness/run-wpt.mjs" "$@"