Expose ClickException and UsageError from the typer namespace

tests/test_exit_errors.py

@@ -56,3 +56,27 @@ def main():
 
     result = runner.invoke(app)
     assert result.exit_code == 1
+
+
+def test_click_exception():
+    app = typer.Typer()
+
+    @app.command()
+    def main():
+        raise typer.ClickException("something broke")
+
+    result = runner.invoke(app)
+    assert result.exit_code == 1
+    assert "something broke" in result.output
+
+
+def test_usage_error():
+    app = typer.Typer()
+
+    @app.command()
+    def main():
+        raise typer.UsageError("bad usage")
+
+    result = runner.invoke(app)
+    assert result.exit_code == 2
+    assert "bad usage" in result.output

typer/__init__.py

@@ -7,7 +7,9 @@
 from . import colors as colors
 from ._click.exceptions import Abort as Abort
 from ._click.exceptions import BadParameter as BadParameter
+from ._click.exceptions import ClickException as ClickException
 from ._click.exceptions import Exit as Exit
+from ._click.exceptions import UsageError as UsageError
 from ._click.termui import confirm as confirm
 from ._click.termui import getchar as getchar
 from ._click.termui import progressbar as progressbar