diff --git a/tests/test_commands.py b/tests/test_commands.py
new file mode 100644
index 0000000..2bf80cd
--- /dev/null
+++ b/tests/test_commands.py
@@ -0,0 +1,30 @@
+"""Test command line invocations.
+
+SPDX-FileCopyrightText: © 2023 Brian S. Stephan <bss@incorporeal.org>
+SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+import os
+import tempfile
+from subprocess import run
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+
+
+def test_build():
+    """Test some of the output of the core builder command."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        result = run(['incorporealcms-build', os.path.join(HERE, 'instance'), tmpdir],
+                     capture_output=True, encoding='utf8')
+        assert "creating temporary directory" in result.stdout
+        assert "copying file" in result.stdout
+        assert "creating symlink" in result.stdout
+        assert "creating directory" in result.stdout
+        assert "renaming" in result.stdout
+
+
+def test_build_error():
+    """Test some of the output of the core builder command."""
+    result = run(['incorporealcms-build', os.path.join(HERE, 'instance'), os.path.join(HERE, 'test_markdown.py')],
+                 capture_output=True, encoding='utf8')
+    assert "specified output path" in result.stderr
+    assert "exists as a file!" in result.stderr