✅ Add tests for completion

tests/test_completion.py

@@ -0,0 +1,49 @@
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+import typer
+from typer.testing import CliRunner
+
+from first_steps import tutorial001 as mod
+
+runner = CliRunner()
+app = typer.Typer()
+app.command()(mod.main)
+
+
+def test_show_completion():
+    result = subprocess.run(
+        [
+            "bash",
+            "-c",
+            f"{sys.executable}  -m coverage run {mod.__file__} --show-completion",
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding="utf-8",
+        env={**os.environ, "SHELL": "/bin/bash"},
+    )
+    assert "_TUTORIAL001.PY_COMPLETE=complete-bash" in result.stdout
+
+
+def test_install_completion():
+    bash_completion_path: Path = Path.home() / ".bash_completion"
+    text = ""
+    if bash_completion_path.is_file():
+        text = bash_completion_path.read_text()
+    result = subprocess.run(
+        [
+            "bash",
+            "-c",
+            f"{sys.executable} -m coverage run {mod.__file__} --install-completion",
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        encoding="utf-8",
+        env={**os.environ, "SHELL": "/bin/bash"},
+    )
+    new_text = bash_completion_path.read_text()
+    assert "_TUTORIAL001.PY_COMPLETE=complete-bash" in new_text
+    bash_completion_path.write_text(text)

typer/completion.py

@@ -12,7 +12,7 @@ click_completion.init()
 
 def install_callback(ctx: click.Context, param: click.Parameter, value: Any) -> Any:
     if not value or ctx.resilient_parsing:
-        return value
+        return value  # pragma no cover
     shell, path = click_completion.core.install()
     click.secho(f"{shell} completion installed in {path}.", fg="green")
     click.echo("Completion will take effect once you restart the terminal.")
@@ -21,7 +21,7 @@ def install_callback(ctx: click.Context, param: click.Parameter, value: Any) ->
 
 def show_callback(ctx: click.Context, param: click.Parameter, value: Any) -> Any:
     if not value or ctx.resilient_parsing:
-        return value
+        return value  # pragma no cover
     click.echo(click_completion.core.get_code())
     sys.exit(0)
 
@@ -45,4 +45,4 @@ def _install_completion_placeholder_function(
         help="Show completion for the current shell, to copy it or customize the installation.",
     ),
 ) -> Any:
-    pass
+    pass  # pragma no cover