diff --git a/batavia/modules.js b/batavia/modules.js
index 3e2e6fe0b..495742373 100644
--- a/batavia/modules.js
+++ b/batavia/modules.js
@@ -5,6 +5,7 @@
 
 module.exports = {
     '_compile': require('./modules/_compile/_compile'),
+    '_hashlib': require('./modules/_hashlib'),
     '_operator': require('./modules/_operator'),
     '_weakref': require('./modules/_weakref'),
     'base64': require('./modules/base64'),
@@ -15,6 +16,6 @@ module.exports = {
     'math': require('./modules/math'),
     'sys': require('./modules/sys'),
     'time': require('./modules/time'),
-    'random': require('./modules/random')
+    'random': require('./modules/random'),
     'webbrowser': require('./modules/webbrowser')
 }
diff --git a/batavia/modules/_hashlib.js b/batavia/modules/_hashlib.js
new file mode 100644
index 000000000..db902cde3
--- /dev/null
+++ b/batavia/modules/_hashlib.js
@@ -0,0 +1,13 @@
+var hashlib = {
+    '__doc__': '',
+    '__file__': 'batavia/modules/hashlib.js',
+    '__name__': 'hashlib',
+    '__package__': ''
+}
+
+// hashlib.choice = function(choices) {
+//     var index = Math.floor(Math.hashlib() * choices.length)
+//     return choices[index]
+// }
+
+module.exports = hashlib
diff --git a/compile_stdlib.py b/compile_stdlib.py
index e8fe3eab3..6670fd0af 100644
--- a/compile_stdlib.py
+++ b/compile_stdlib.py
@@ -27,9 +27,11 @@ def parse_args():
     enabled_modules = args.modules or [
         '_weakrefset',
         'abc',
+        'antigravity',
         'bisect',
         'colorsys',
         'copyreg',
+        'hashlib',
         'token',
         'operator',
         'stat',
diff --git a/package.json b/package.json
index 7655fa061..439af55b2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@pybee/batavia",
-  "version": "3.4.0-dev.18",
+  "version": "3.4.0-dev.19",
   "description": "A Javascript implementation of the Python virtual machine.",
   "main": "batavia/batavia.js",
   "directories": {
diff --git a/tests/modules/test_hashlib.py b/tests/modules/test_hashlib.py
new file mode 100644
index 000000000..75a49a971
--- /dev/null
+++ b/tests/modules/test_hashlib.py
@@ -0,0 +1,46 @@
+import unittest
+
+from ..utils import TranspileTestCase
+
+
+class HashlibTests:
+    @unittest.expectedFailure
+    def test_digest(self):
+        self.assertCodeExecution("""
+            import hashlib
+            m = hashlib.%s()
+            m.update(b"Nobody inspects")
+            m.update(b" the spammish repetition")
+            print(m.digest())
+            """ % self.ALGORITHM)
+
+    @unittest.expectedFailure
+    def test_hexdigest(self):
+        self.assertCodeExecution("""
+            import hashlib
+            print(hashlib.%s(b"Nobody inspects the spammish repetition").hexdigest())
+            """ % self.ALGORITHM)
+
+
+class MD5Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'md5'
+
+
+class SHA1Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'sha1'
+
+
+class SHA224Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'sha224'
+
+
+class SHA256Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'sha256'
+
+
+class SHA384Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'sha384'
+
+
+class SHA512Tests(TranspileTestCase, HashlibTests):
+    ALGORITHM = 'sha512'
diff --git a/tests/modules/test_random.py b/tests/modules/test_random.py
index 7c9c7c8bb..5b9154337 100644
--- a/tests/modules/test_random.py
+++ b/tests/modules/test_random.py
@@ -1,10 +1,12 @@
-import unittest
+from ..utils import TranspileTestCase
 
-import random
-
-class RandomTests(unittest.TestCase):
 
+class RandomTests(TranspileTestCase):
     def test_choice(self):
-        numbers = [1, 2, 3, 4, 5, 6, 7, 8]
-        random_number = random.choice(numbers)
-        self.assertIn(random_number, numbers)
+        self.assertCodeExecution("""
+            import random
+
+            numbers = [1, 2, 3, 4, 5, 6, 7, 8]
+            random_number = random.choice(numbers)
+            self.assertIn(random_number, numbers)
+            """)
diff --git a/tests/modules/test_webbrowser.py b/tests/modules/test_webbrowser.py
index aa715d4fd..40ece5b91 100644
--- a/tests/modules/test_webbrowser.py
+++ b/tests/modules/test_webbrowser.py
@@ -1,6 +1,8 @@
-from ..utils import ModuleFunctionTestCase, TranspileTestCase
+from ..utils import TranspileTestCase
 
-class Base64Tests(ModuleFunctionTestCase, TranspileTestCase):
+class WebbrowserTests(TranspileTestCase):
     def test_import(self):
-        self.assertCodeExecution("import webbrowser")
+        self.assertCodeExecution("""
+            import webbrowser
+            """)
 
diff --git a/webpack.config.js b/webpack.config.js
index c671602ec..154532416 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -13,6 +13,10 @@ module.exports = {
         libraryTarget: 'umd'
     },
     target: 'web',
+    plugins: [
+        new webpack.HotModuleReplacementPlugin(),
+        new webpack.NoEmitOnErrorsPlugin()
+    ],
     module: {
         rules: [
             {