Fix JSTester.run_file() for new pkg_resources

Read the file via open() instead of utils.read_file.

tests/unit/javascript/conftest.py

@@ -27,6 +27,7 @@ import jinja2
 
 from PyQt5.QtCore import QUrl
 
+import qutebrowser
 from qutebrowser.utils import utils
 
 
@@ -90,15 +91,16 @@ class JSTester:
         if not force:
             assert blocker.args == [True]
 
-    def run_file(self, filename: str, expected=None) -> None:
+    def run_file(self, path: str, expected=None) -> None:
         """Run a javascript file.
 
         Args:
-            filename: The javascript filename, relative to
-                      qutebrowser/javascript.
+            path: The path to the JS file, relative to the qutebrowser package.
             expected: The value expected return from the javascript execution
         """
-        source = utils.read_file(os.path.join('javascript', filename))
+        base_path = os.path.dirname(os.path.abspath(qutebrowser.__file__))
+        with open(os.path.join(base_path, path), 'r', encoding='utf-8') as f:
+            source = f.read()
         self.run(source, expected)
 
     def run(self, source: str, expected, world=None) -> None:

tests/unit/javascript/position_caret/test_position_caret.py

@@ -50,7 +50,7 @@ class CaretTester:
 
     def check(self):
         """Check whether the caret is before the MARKER text."""
-        self.js.run_file('position_caret.js')
+        self.js.run_file('javascript/position_caret.js')
         self.js.tab.caret.toggle_selection()
         self.js.tab.caret.move_to_next_word()
 

tests/unit/javascript/stylesheet/test_stylesheet.py

@@ -131,6 +131,6 @@ def test_set_error(stylesheet_tester, config_stub):
 def test_appendchild(stylesheet_tester):
     stylesheet_tester.js.load('stylesheet/simple.html')
     stylesheet_tester.init_stylesheet()
-    js_test_file_path = ('../../tests/unit/javascript/stylesheet/'
+    js_test_file_path = ('../tests/unit/javascript/stylesheet/'
                          'test_appendchild.js')
     stylesheet_tester.js.run_file(js_test_file_path, {})