Working on tests

tests/test_CommandLine.py

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+import unittest
+import subprocess
+
+
+class TestCommandLine(unittest.TestCase):
+    def test_help(self):
+        args = ["-h", "--help"]
+        readme_help_lines = []
+
+        # Read help from readme:
+        with open("README.md", mode="r", encoding="utf-8") as readme:
+            is_help_line = False
+
+            for line in readme.readlines():
+                if line == "> dyn2py --help":
+                    is_help_line = True
+                elif is_help_line and line == "```":
+                    # It's the end of the help
+                    break
+                elif is_help_line:
+                    readme_help_lines.append(line)
+
+        for arg in args:
+            p = subprocess.run(
+                ["dyn2py", arg], capture_output=True, shell=True)
+            output_help = p.stdout.decode()
+            output_help_lines = output_help.split("\n")
+
+            self.assertEqual(output_help.count("\n"), len(readme_help_lines))
+            for i, l in enumerate(readme_help_lines):
+                self.assertEqual(l, output_help_lines[i])