diff --git a/TODO b/TODO
index af6733f..f2c6001 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,4 @@
 Todo
-- Test the tools.
 - Publish. pypi and github will do.
   - docs?, setup.py?, wheel?, __pkginfo__.py?
   - Maybe also use cxfreeze, py2exe, pyrun or zipapp?  Is zipapp the standard way?
@@ -159,7 +158,8 @@ Done
 - Don't let the user scroll indefinately below the end of the page.
 - Add command line options, e.g. -h
 - Boilerplate: Readme, usage
-
+- Test the tools.
+  <- All the existing tools now have basic tests.
 
 A-syntax, B-tests, C-auto docs, D-lint, E-coverage, F-profile, G-tidy, H-import deps
              A B C D E F G H
diff --git a/golden-files/input/hi3.cpython-34.pyc b/golden-files/input/hi3.cpython-34.pyc
new file mode 100644
index 0000000..ee2fac4
Binary files /dev/null and b/golden-files/input/hi3.cpython-34.pyc differ
diff --git a/tools.py b/tools.py
index 3fb69b8..d8e7d3f 100644
--- a/tools.py
+++ b/tools.py
@@ -396,7 +396,8 @@ def python_tidy(path):  # Deps: found on internet?
 
 
 def disassemble_pyc(path):
-    bytecode = open(path, "rb").read()
+    with open(path, "rb") as file_:
+        bytecode = file_.read()
     stringio = io.StringIO()
     dis.dis(bytecode, file=stringio)
     stringio.seek(0)
diff --git a/tools_test.py b/tools_test.py
index b4c036d..54829f5 100755
--- a/tools_test.py
+++ b/tools_test.py
@@ -106,6 +106,10 @@ class ToolsTestCase(unittest.TestCase):
     def test_python_mccable(self):
         self._test_tool(tools.python_mccabe, self.HI_OK)
 
+    def test_disassemble_pyc(self):
+        self._test_tool(tools.disassemble_pyc,
+                        [("hi3.cpython-34.pyc", tools.Status.normal)])
+
     def test_perl_syntax(self):
         self._test_tool(tools.perl_syntax, [("perl.pl", tools.Status.ok)])