adding functional test for cd_correction rule

tests/functional/test_cd_correction.py

@@ -0,0 +1,40 @@
+import pytest
+
+dockerfile = u'''
+FROM python:3
+RUN adduser --disabled-password --gecos '' test
+WORKDIR /src
+USER test
+RUN echo 'eval $(thefuck --alias)' > /home/test/.bashrc
+RUN echo > /home/test/.bash_history
+RUN mkdir -p /home/test/some/random/folder
+RUN mkdir -p /home/test/another/random/folder
+USER root
+'''
+
+
+def plot(proc, TIMEOUT):
+    proc.sendline(u'cd /home/test/some/random')
+    proc.sendline(u'fuck')
+    assert proc.expect([TIMEOUT, u'No fucks given'])
+    proc.sendline(u'cd flder')
+    proc.sendline(u'fuck')
+    assert proc.expect([TIMEOUT, u'cd "/home/test/some/random/folder"'])
+    proc.send('\n')
+    proc.sendline(u'pwd')
+    assert proc.expect([TIMEOUT, u'/home/test/some/random/folder'])
+    proc.sendline(u'cd /home/test/another/randm/folder/')
+    proc.sendline(u'fuck')
+    assert proc.expect([TIMEOUT, u'cd "/home/test/another/random/folder"'])
+    proc.send('\n')
+    proc.sendline(u'pwd')
+    assert proc.expect([TIMEOUT, u'/home/test/another/random/folder'])
+
+
+@pytest.mark.functional
+def test_performance(spawnu, TIMEOUT, benchmark):
+    proc = spawnu(u'thefuck/python3-cd_correction-functional',
+                  dockerfile, u'bash')
+    proc.sendline(u'pip install /src')
+    proc.sendline(u'su test')
+    assert benchmark(plot, proc, TIMEOUT) is None