diff --git a/README.md b/README.md
index b4e6dcb..cc39da1 100644
--- a/README.md
+++ b/README.md
@@ -23,10 +23,10 @@ then to run:
 
 ### Tools
 
-Extensions(98) | Tools(59)
+Extensions(98) | Tools(60)
 ----------:| -----
 .* | [contents](http://pygments.org/) • metadata • [git_blame](https://git-scm.com/docs/git-blame) • [git_log](https://git-scm.com/docs/git-log)
-.py | [python_syntax](https://en.wikipedia.org/wiki/Python_syntax_and_semantics) • [python_unittests](https://docs.python.org/3/library/unittest.html) • [pydoc](https://docs.python.org/3/library/pydoc.html) • [mypy](http://mypy-lang.org/) • [python_coverage](https://coverage.readthedocs.io/) • [pycodestyle](http://pycodestyle.pycqa.org/en/latest/) • [pydocstyle](http://www.pydocstyle.org/en/2.1.1/usage.html) • [pyflakes](https://pypi.org/project/pyflakes/) • [pylint](https://www.pylint.org/) • [python_gut](https://github.com/ahamilton/eris/blob/master/gut.py) • [python_modulefinder](https://docs.python.org/3/library/modulefinder.html) • [dis](https://docs.python.org/3/library/dis.html) • [python_mccabe](https://pypi.org/project/mccabe/) • [bandit](https://pypi.org/project/bandit/)
+.py | [python_syntax](https://en.wikipedia.org/wiki/Python_syntax_and_semantics) • [python_unittests](https://docs.python.org/3/library/unittest.html) • [pytest](https://docs.pytest.org/en/latest/) • [pydoc](https://docs.python.org/3/library/pydoc.html) • [mypy](http://mypy-lang.org/) • [python_coverage](https://coverage.readthedocs.io/) • [pycodestyle](http://pycodestyle.pycqa.org/en/latest/) • [pydocstyle](http://www.pydocstyle.org/en/2.1.1/usage.html) • [pyflakes](https://pypi.org/project/pyflakes/) • [pylint](https://www.pylint.org/) • [python_gut](https://github.com/ahamilton/eris/blob/master/gut.py) • [python_modulefinder](https://docs.python.org/3/library/modulefinder.html) • [dis](https://docs.python.org/3/library/dis.html) • [python_mccabe](https://pypi.org/project/mccabe/) • [bandit](https://pypi.org/project/bandit/)
 .pl .pm .t | [perl_syntax](https://en.wikipedia.org/wiki/Perl) • [perldoc](http://perldoc.perl.org/)
 .p6 .pm6 | [perl6_syntax](https://rakudo.org/)
 .pod .pod6 | [perldoc](http://perldoc.perl.org/)
@@ -40,7 +40,7 @@ Extensions(98) | Tools(59)
 .bash .sh .dash .ksh | [shellcheck](https://www.shellcheck.net/)
 .wasm | [wasm_validate](https://github.com/WebAssembly/wabt) • [wasm_objdump](https://github.com/WebAssembly/wabt)
 .pdf | [pdf2txt](https://github.com/pdfminer/pdfminer.six)
-.html .htm | [html_syntax](http://www.html-tidy.org/) • [html2text](http://www.mbayer.de/html2text/) • [pandoc](https://pandoc.org/) • [elinks](http://elinks.cz/)
+.html .htm | [html_syntax](http://www.html-tidy.org/) • [html2text](http://www.mbayer.de/html2text/) • [elinks](http://elinks.cz/)
 .yaml .yml | [yamllint](https://github.com/adrienverge/yamllint)
 .md .epub .docx .odt .rst | [pandoc](https://pandoc.org/)
 .zip .jar .apk .egg .whl | [zipinfo](http://www.info-zip.org/UnZip.html)
diff --git a/eris/tools.py b/eris/tools.py
index 14196fd..ecb6baa 100644
--- a/eris/tools.py
+++ b/eris/tools.py
@@ -278,6 +278,23 @@ def python_unittests(path):
         return Status.not_applicable, "No tests."
 
 
+@deps(deps={"pip/pytest"}, url="https://docs.pytest.org/en/latest/",
+      executables={"pytest"})
+def pytest(path):
+    command = ["pytest", "--doctest-modules", "--color=yes", path]
+    process = subprocess.run(command, stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE, text=True,
+                             timeout=TIMEOUT)
+    stdout, stderr, returncode = (
+        termstr.TermStr.from_term(process.stdout),
+        termstr.TermStr.from_term(process.stderr), process.returncode)
+    if returncode == 5:
+        status = Status.not_applicable
+    else:
+        status = Status.ok if returncode == 0 else Status.problem
+    return status, (stdout + stderr)
+
+
 @deps(url="https://docs.python.org/3/library/pydoc.html")
 def pydoc(path):
     stdout, stderr, returncode = _do_command(
diff --git a/eris/tools.toml b/eris/tools.toml
index 853c10e..c66a1eb 100644
--- a/eris/tools.toml
+++ b/eris/tools.toml
@@ -3,7 +3,7 @@
 # Licensed under the Artistic License 2.0.
 
 tools_for_extensions = [
-   [["py"], ["python_syntax", "python_unittests", "pydoc", "mypy",
+   [["py"], ["python_syntax", "python_unittests", "pytest", "pydoc", "mypy",
              "python_coverage", "pycodestyle", "pydocstyle", "pyflakes",
 	     "pylint", "python_gut", "python_modulefinder", "dis",
 	     "python_mccabe", "bandit"]],