diff --git a/Dockerfile b/Dockerfile
index 7cf3352..e1406b4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,4 +5,4 @@ LABEL Description="This image should provide environment to lint neotags" Vendor
 
 # Install dependencies
 RUN pip install --upgrade pip
-RUN pip install --no-cache-dir pep8 neovim
+RUN pip install --no-cache-dir pep8 neovim pyfakefs
diff --git a/readme.rst b/readme.rst
index 6068f46..995af81 100644
--- a/readme.rst
+++ b/readme.rst
@@ -38,3 +38,14 @@ The following options are available:
 
 - ``let g:neotags_logging = 0``
    Defines whether to log anything to vims messages.
+
+Development
+===========
+
+Install dependencies:
+
+- ``pip install pyfakefs``
+
+Run tests:
+
+``cd rplugin && python -m unittest test.test_neotags``
diff --git a/rplugin/test/templates/tags b/rplugin/test/templates/tags
new file mode 100644
index 0000000..b2352b5
--- /dev/null
+++ b/rplugin/test/templates/tags
@@ -0,0 +1,9 @@
+!_TAG_FILE_FORMAT	2	/extended format; --format=1 will not append ;" to lines/
+!_TAG_FILE_SORTED	1	/0=unsorted, 1=sorted, 2=foldcase/
+!_TAG_PROGRAM_AUTHOR	Universal Ctags Team	//
+!_TAG_PROGRAM_NAME	Universal Ctags	/Derived from Exuberant Ctags/
+!_TAG_PROGRAM_URL	https://ctags.io/	/official site/
+!_TAG_PROGRAM_VERSION	0.0.0	/4f741b9/
+SomeClass	example.py	/^class SomeClass(object):$/;"	kind:class	line:1	language:Python	inherits:object	access:public	end:7
+__init__	example.py	/^    def __init__(self):$/;"	kind:member	line:3	language:Python	scope:class:SomeClass	access:public	signature:(self)	end:5
+method	example.py	/^    def method(self):$/;"	kind:member	line:6	language:Python	scope:class:SomeClass	access:public	signature:(self)	end:7
diff --git a/rplugin/test/test_neotags.py b/rplugin/test/test_neotags.py
index 486aa89..25e5b26 100644
--- a/rplugin/test/test_neotags.py
+++ b/rplugin/test/test_neotags.py
@@ -110,6 +110,10 @@ class TestNeotagsPlugin(fake_filesystem_unittest.TestCase):
             'expected_tags'
         )
 
+        self.copyRealFile(
+            expected_tags_file,
+            expected_tags_file
+        )
         self.copyRealFile(
             os.path.join(self.templates_dirname, 'example.py'),
             os.path.join(os.path.dirname(filename), os.path.basename(filename))