test: add more tests

tests/js_compat_test/BUILD.bazel

@@ -39,3 +39,30 @@ sh_test(
     args = ["$(location :compat_devserver)"],
     data = [":compat_devserver"],
 )
+
+js_run_devserver(
+    name = "compat_devserver_with_package_json",
+    tool = ":compat_bin",
+    package_json = "app/package.json",
+    working_dir = "package",
+)
+
+js_run_devserver(
+    name = "compat_devserver_with_package_dir_hint",
+    tool = ":compat_bin",
+    package_dir_hint = "app",
+    working_dir = "package",
+)
+
+sh_test(
+    name = "js_run_devserver_workspace_shape_test",
+    srcs = ["verify_workspace_shape.sh"],
+    args = [
+        "$(location :compat_devserver_with_package_json)",
+        "$(location :compat_devserver_with_package_dir_hint)",
+    ],
+    data = [
+        ":compat_devserver_with_package_json",
+        ":compat_devserver_with_package_dir_hint",
+    ],
+)

tests/js_compat_test/app/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "js-compat-app",
+  "private": true
+}

tests/js_compat_test/verify_workspace_shape.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+package_json_launcher="$1"
+package_dir_hint_launcher="$2"
+
+grep -Fq -- 'package_json="${runfiles_dir}/_main/tests/js_compat_test/app/package.json"' "${package_json_launcher}"
+grep -Fq -- 'package_rel_dir_hint="."' "${package_json_launcher}"
+grep -Fq -- 'working_dir_mode="package"' "${package_json_launcher}"
+
+grep -Fq -- 'package_json=""' "${package_dir_hint_launcher}"
+grep -Fq -- 'package_rel_dir_hint="app"' "${package_dir_hint_launcher}"
+grep -Fq -- 'working_dir_mode="package"' "${package_dir_hint_launcher}"