diff --git a/.github/workflows/compile-linux.yml b/.github/workflows/compile-linux.yml
index bf9a2f9..a283e8f 100644
--- a/.github/workflows/compile-linux.yml
+++ b/.github/workflows/compile-linux.yml
@@ -27,13 +27,21 @@ jobs:
         run: |
           sudo apt-get -y install libjpeg-dev
 
-      # Initialize and build
+      - name: Set up Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: "3.11"
+
       - name: Build
         run: |
           ./configure
           make -j
           make printable.man
 
+      - name: Tests
+        run: |
+          make test
+
       # Gather documentation and executables to a common directory
       - name: Prepare files
         if: matrix.os != 'ubuntu-latest'
diff --git a/Makefile.in b/Makefile.in
index 83b581d..348cf5c 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -103,7 +103,7 @@ spell:
 	codespell -S .git,tools
 
 test:   all
-	(cd test && $(PYTHON) test.py)
+	(cd test && $(PYTHON) test.py -v)
 
 
 .PHONY:	test
diff --git a/test/test.py b/test/test.py
old mode 100644
new mode 100755
index f291d5b..5d143f3
--- a/test/test.py
+++ b/test/test.py
@@ -31,12 +31,7 @@ class JpeginfoTests(unittest.TestCase):
 
     def run_test(self, args, check=True):
         """execute jpeginfo for a test"""
-        command = [self.program]
-        if isinstance(args, list):
-            command.extend(args)
-        else:
-            if len(args) > 0:
-                command.append(args)
+        command = [self.program] + args
         res = subprocess.run(command, encoding="utf-8", check=check,
                              stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
         output = res.stdout
@@ -47,25 +42,69 @@ def run_test(self, args, check=True):
 
     def test_version(self):
         """test version information output"""
-        output, _ = self.run_test('--version')
+        output, _ = self.run_test(['--version'])
         self.assertIn('GNU General Public License', output)
         self.assertRegex(output, r'jpeginfo v\d+\.\d+\.\d')
 
     def test_noarguments(self):
         """test running withouth arguments"""
-        output, res = self.run_test('', check=False)
+        output, res = self.run_test([], check=False)
         self.assertEqual(1, res)
         self.assertIn('file arguments missing', output)
 
     def test_basic(self):
         """test basic output"""
-        output, _ = self.run_test('jpeginfo_test1.jpg')
+        output, _ = self.run_test(['jpeginfo_test1.jpg'])
         self.assertRegex(output,
                          r'jpeginfo_test1.jpg\s+2100\s+x\s+1500\s+24bit\s+'
                          r'P\s+Exif,IPTC,XMP,ICC,Adobe,UNKNOWN\s+320159')
 
+    def test_check_mode(self):
+        """test checking image integrity"""
+        output, res = self.run_test(['-c','jpeginfo_test2.jpg'], check=False)
+        self.assertEqual(0, res)
+        output, res = self.run_test(['-c','jpeginfo_test2_broken.jpg'], check=False)
+        self.assertIn('WARNING Premature end of JPEG file', output)
+        self.assertNotEqual(0, res)
+
+    def test_progressive(self):
+        """test progressive mode detection"""
+        output, _ = self.run_test(['jpeginfo_test1.jpg'])
+        self.assertRegex(output, r'bit\s+P\s+')
+
+    def test_nonprogressive(self):
+        """test non-progressive mode detection"""
+        output, _ = self.run_test(['jpeginfo_test2.jpg'])
+        self.assertRegex(output, r'bit\s+N\s')
+
+    def test_grayscale(self):
+        """test grayscale image detection"""
+        output, _ = self.run_test(['jpeginfo_test3.jpg'])
+        self.assertRegex(output, r'\s8bit\s')
+
+    def test_md5(self):
+        """test image MD5 checksum"""
+        output, _ = self.run_test(['--md5', 'jpeginfo_test1.jpg'])
+        self.assertIn('536c217b027d44cc2e4a0ad8e6e531fe', output)
+
+    def test_sha256(self):
+        """test image SHA2-256 checksum"""
+        output, _ = self.run_test(['--sha256', 'jpeginfo_test1.jpg'])
+        self.assertIn('9a36209da080e187a2f749ec4ed0db3e73bcebc689ca060d929bdc7d1384edac', output)
+
+    def test_sha512(self):
+        """test image SHA2-512 checksum"""
+        output, _ = self.run_test(['--sha512', 'jpeginfo_test1.jpg'])
+        self.assertIn('4d5dc047caf3cbd84eec91dce3c14e938d8d3f730b152eefb72c8c3ebfa65e91'
+                      '46bd304b15e009df6f74e7397435a10f375c5453a60e32c9aca738051c36e211', output)
+
+    def test_comments(self):
+        """test image comments"""
+        output, _ = self.run_test(['-C', 'jpeginfo_test2.jpg'])
+        self.assertIn('This is a test comment.', output)
+
+
 if __name__ == '__main__':
     unittest.main()
 
-
 # eof :-)