make check unused work

pipenv/core.py

@@ -242,7 +242,7 @@ def import_from_code(path="."):
 
     rs = []
     try:
-        for r in pipreqs.get_all_imports(path):
+        for r in pipreqs.get_all_imports(path, encoding="utf-8"):
             if r not in BAD_PACKAGES:
                 rs.append(r)
         pkg_names = pipreqs.get_pkg_names(rs)
@@ -2537,8 +2537,8 @@ def do_check(
     if not args:
         args = []
     if unused:
-        deps_required = [k for k in project.packages.keys()]
-        deps_needed = import_from_code(unused)
+        deps_required = [k.lower() for k in project.packages.keys()]
+        deps_needed = [k.lower() for k in import_from_code(unused)]
         for dep in deps_needed:
             try:
                 deps_required.remove(dep)

tests/integration/test_cli.py

@@ -217,20 +217,21 @@ def test_install_parse_error(PipenvInstance, pypi):
 @pytest.mark.code
 @pytest.mark.check
 @pytest.mark.unused
-@pytest.mark.skip(reason="non-deterministic")
 def test_check_unused(PipenvInstance, pypi):
     with PipenvInstance(chdir=True, pypi=pypi) as p:
         with open('__init__.py', 'w') as f:
             contents = """
 import tablib
 import records
+import flask
             """.strip()
             f.write(contents)
         p.pipenv('install requests')
         p.pipenv('install tablib')
-        p.pipenv('install records')
+        p.pipenv('install flask')
 
-        assert all(pkg in p.pipfile['packages'] for pkg in ['requests', 'tablib', 'records'])
+        assert all(pkg in p.pipfile['packages'] for pkg in ['requests', 'tablib', 'flask'])
 
         c = p.pipenv('check --unused .')
         assert 'tablib' not in c.out
+        assert 'flask' not in c.out