✅ Add tests for CLI arguments

tests/test_tutorial/test_arguments/test_tutorial001.py

@@ -0,0 +1,33 @@
+import subprocess
+
+import typer
+from typer.testing import CliRunner
+
+from arguments import tutorial001 as mod
+
+runner = CliRunner()
+
+app = typer.Typer()
+app.command()(mod.main)
+
+
+def test_call_no_arg():
+    result = runner.invoke(app)
+    assert result.exit_code != 0
+    assert 'Error: Missing argument "NAME".' in result.output
+
+
+def test_call_arg():
+    result = runner.invoke(app, ["Camila"])
+    assert result.exit_code == 0
+    assert "Hello Camila" in result.output
+
+
+def test_script():
+    result = subprocess.run(
+        ["coverage", "run", mod.__file__, "--help"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding="utf-8",
+    )
+    assert "Usage" in result.stdout

tests/test_tutorial/test_arguments/test_tutorial002.py

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+import subprocess
+
+import typer
+from typer.testing import CliRunner
+
+from arguments import tutorial002 as mod
+
+runner = CliRunner()
+
+app = typer.Typer()
+app.command()(mod.main)
+
+
+def test_help():
+    result = runner.invoke(app, ["--help"])
+    assert result.exit_code == 0
+    assert "[OPTIONS] [NAME]" in result.output
+
+
+def test_call_no_arg():
+    result = runner.invoke(app)
+    assert result.exit_code == 0
+    assert "Hello World!" in result.output
+
+
+def test_call_arg():
+    result = runner.invoke(app, ["Camila"])
+    assert result.exit_code == 0
+    assert "Hello Camila" in result.output
+
+
+def test_script():
+    result = subprocess.run(
+        ["coverage", "run", mod.__file__, "--help"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding="utf-8",
+    )
+    assert "Usage" in result.stdout

tests/test_tutorial/test_arguments/test_tutorial003.py

@@ -0,0 +1,39 @@
+import subprocess
+
+import typer
+from typer.testing import CliRunner
+
+from arguments import tutorial003 as mod
+
+runner = CliRunner()
+
+app = typer.Typer()
+app.command()(mod.main)
+
+
+def test_help():
+    result = runner.invoke(app, ["--help"])
+    assert result.exit_code == 0
+    assert "[OPTIONS] [NAME]" in result.output
+
+
+def test_call_no_arg():
+    result = runner.invoke(app)
+    assert result.exit_code == 0
+    assert "Hello Wade Wilson" in result.output
+
+
+def test_call_arg():
+    result = runner.invoke(app, ["Camila"])
+    assert result.exit_code == 0
+    assert "Hello Camila" in result.output
+
+
+def test_script():
+    result = subprocess.run(
+        ["coverage", "run", mod.__file__, "--help"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding="utf-8",
+    )
+    assert "Usage" in result.stdout