Revert "Don't set NODE_PATH during testing (#10001)" (#10024)

This reverts commit 9b53263.

Author: sbc100

tests/runner.py

@@ -450,6 +450,9 @@ def setUp(self):
       self.working_dir = tempfile.mkdtemp(prefix='emscripten_test_' + self.__class__.__name__ + '_', dir=self.temp_dir)
     os.chdir(self.working_dir)
 
+    # Use emscripten root for node module lookup
+    os.environ['NODE_PATH'] = path_from_root('node_modules')
+
     if not self.save_dir:
       self.has_prev_ll = False
       for temp_file in os.listdir(TEMP_DIR):

tools/scons/site_scons/site_tools/emscripten/emscripten.py

@@ -25,7 +25,7 @@ def generate(env, emscripten_path=None, **kw):
               'EMCC_AUTODEBUG', 'EMMAKEN_JUST_CONFIGURE_RECURSE', 'CONFIGURE_CC',
               'EMMAKEN_COMPILER', 'EMMAKEN_CFLAGS', 'EMCC_JSOPT_BLACKLIST',
               'MOZ_DISABLE_AUTO_SAFE_MODE', 'EMCC_STDERR_FILE',
-              'EMSCRIPTEN_SUPPRESS_USAGE_WARNING', 'EM_SAVE_DIR', 'EMCC_JSOPT_MIN_CHUNK_SIZE',
+              'EMSCRIPTEN_SUPPRESS_USAGE_WARNING', 'EM_SAVE_DIR', 'NODE_PATH', 'EMCC_JSOPT_MIN_CHUNK_SIZE',
               'EMCC_JSOPT_MAX_CHUNK_SIZE', 'EMCC_SAVE_OPT_TEMP', 'EMCC_CORES', 'EMCC_NO_OPT_SORT',
               'EMCC_BUILD_DIR', 'EM_POPEN_WORKAROUND', 'EMCC_DEBUG_SAVE', 'EMCC_SKIP_SANITY_CHECK',
               'EMMAKEN_NO_SDK', 'EM_PKG_CONFIG_PATH', 'EMCC_CLOSURE_ARGS', 'JAVA_HEAP_SIZE',