Still get error messages out (through console)

src/pyodide.js

@@ -125,7 +125,9 @@ var languagePluginLoader = new Promise((resolve, reject) => {
   let loadPackage = (names) => {
     /* We want to make sure that only one loadPackage invocation runs at any
      * given time, so this creates a "chain" of promises. */
-    loadPackagePromise = loadPackagePromise.then(() => _loadPackage(names));
+    loadPackagePromise = loadPackagePromise
+      .then(() => _loadPackage(names))
+      .catch((e) => console.log(e.to_string()));
     return loadPackagePromise;
   };
 

test/conftest.py

@@ -94,7 +94,7 @@ class SeleniumWrapper:
         self.run_js(
             'window.done = false\n' +
             'pyodide.loadPackage({!r})'.format(packages) +
-            '.then(function() { window.done = true; })')
+            '.finally(function() { window.done = true; })')
         self.wait_until_packages_loaded()
 
     def wait_until_packages_loaded(self):

test/test_package_loading.py

@@ -18,10 +18,9 @@ def test_load_from_url(selenium_standalone, web_server):
 
 def test_uri_mismatch(selenium_standalone):
     selenium_standalone.load_package('pyparsing')
-    with pytest.raises(WebDriverException,
-                       match="URI mismatch, attempting "
-                             "to load package pyparsing"):
-        selenium_standalone.load_package('http://some_url/pyparsing.js')
+    selenium_standalone.load_package('http://some_url/pyparsing.js')
+    assert ("URI mismatch, attempting to load package pyparsing" in
+            selenium_standalone.logs)
     assert "Invalid package name or URI" not in selenium_standalone.logs
 
 
@@ -62,7 +61,7 @@ def test_load_packages_sequential(selenium_standalone, packages):
     selenium.run_js(
         'window.done = false\n' +
         'Promise.all([{}])'.format(promises) +
-        '.then(function() { window.done = true; })')
+        '.finally(function() { window.done = true; })')
     selenium.wait_until_packages_loaded()
     selenium.run(f'import {packages[0]}')
     selenium.run(f'import {packages[1]}')