diff --git a/meson.build b/meson.build
index 4ba4934..2e4c8cb 100644
--- a/meson.build
+++ b/meson.build
@@ -13,6 +13,8 @@ project(
 python = import('python').find_installation('python3', pure: false)
 python_dep = python.dependency()
 
+fs = import('fs')
+
 libsystemd_dep = dependency('libsystemd')
 
 add_project_arguments(
@@ -26,4 +28,15 @@ update_constants_py = files('update-constants.py')
 
 subdir('src/systemd')
 
+test(
+        'unit',
+        find_program(python.full_path()),
+        args: [
+                '-m', 'pytest',
+                '-v',
+                python_test_dir,
+              ],
+        env: { 'PYTHONPATH': meson.current_build_dir() / 'src' },
+)
+
 alias_target('update-constants', update_constants)
diff --git a/src/systemd/meson.build b/src/systemd/meson.build
index 8d01cd7..842be36 100644
--- a/src/systemd/meson.build
+++ b/src/systemd/meson.build
@@ -46,14 +46,19 @@ python.extension_module(
 )
 
 # Install Python modules
-python.install_sources(
+py_files = files(
         '__init__.py',
         'journal.py',
         'daemon.py',
-        subdir: 'systemd',
 )
 
-# Install test modules
+python.install_sources(py_files, subdir: 'systemd')
+foreach file: py_files
+        fs.copyfile(file)
+endforeach
+
+# Test code
+python_test_dir = meson.current_source_dir() / 'test'
 python.install_sources(
         'test/test_daemon.py',
         'test/test_journal.py',
@@ -62,10 +67,11 @@ python.install_sources(
         subdir: 'systemd/test',
 )
 
+# The 'update-constants' target
 include_dir = libsystemd_dep.get_variable(pkgconfig: 'includedir')
 
 update_constants = custom_target(
-        output: 'update-constants-impl',
+        output: 'update-constants',
         command: [
                 update_constants_py,
                 meson.current_source_dir() / 'id128-constants.h',