diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa2746e..ca3f661 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for MEGAHIT (#13)
 - Support for Unicycler (#14)
 - Support for assembly configuration file (#16)
+- Commands to run a short or long test suite (#20)
 
 
 ## [0.1] 2021-12-01
diff --git a/Makefile b/Makefile
index 9a11d19..eb86578 100644
--- a/Makefile
+++ b/Makefile
@@ -9,6 +9,14 @@ help: Makefile
 
 ## test:        run automated test suite
 test:
+	pytest --cov=yeat -m 'not long'
+
+## testlong:    run only long-running automated tests
+testlong:
+	pytest --cov=yeat -m long
+
+## testall:     run all tests
+testall:
 	pytest --cov=yeat
 
 ## style:       check code style vs Black
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..d57c4e0
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,3 @@
+[pytest]
+markers =
+    long: long running tests
diff --git a/yeat/tests/test_cli.py b/yeat/tests/test_cli.py
index ba3225f..bfd31bb 100644
--- a/yeat/tests/test_cli.py
+++ b/yeat/tests/test_cli.py
@@ -60,6 +60,7 @@ def test_invalid_read2_file():
         cli.run(read1, read2, assemblers)
 
 
+@pytest.mark.long
 def test_multiple_assemblers(capsys, tmp_path):
     wd = str(tmp_path)
     arglist = [
@@ -77,6 +78,7 @@ def test_multiple_assemblers(capsys, tmp_path):
     assert megahit_result.exists()
 
 
+@pytest.mark.long
 def test_unicycler(capsys, tmp_path):
     wd = str(tmp_path)
     arglist = [