prevent automatic environment variables from containing dashes

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/test_options.py b/tests/test_options.py
index 4ad7f3c..bad4f42 100644
--- a/tests/test_options.py
+++ b/tests/test_options.py
@@ -273,6 +273,22 @@ def test_show_envvar_auto_prefix(runner):
     assert 'TEST_ARG1' in result.output
 
 
+def test_show_envvar_auto_prefix_dash_in_command(runner):
+    @click.group()
+    def cli():
+        pass
+
+    @cli.command()
+    @click.option('--baz', show_envvar=True)
+    def foo_bar(baz):
+        pass
+
+    result = runner.invoke(cli, ['foo-bar', '--help'],
+                           auto_envvar_prefix='TEST')
+    assert not result.exception
+    assert 'TEST_FOO_BAR_BAZ' in result.output
+
+
 def test_custom_validation(runner):
     def validate_pos_int(ctx, param, value):
         if value < 0: