Fixed `invoked_subcommand`.

This is actually a very painful commit to make because it has to
change behavior.  On the bright side, this has actually been
broken from 3.1 and people have not noticed much yet, so maybe
it's not a big deal.  The docs also kinda left out the invoked
subcommands bit so I presume it is fine.

This fixes #205

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/test_commands.py b/tests/test_commands.py
index 24118ed..7c8b453 100644
--- a/tests/test_commands.py
+++ b/tests/test_commands.py
@@ -229,3 +229,26 @@ def test_other_command_invoke_with_defaults(runner):
     result = runner.invoke(cli, [])
     assert not result.exception
     assert result.output == '42\n'
+
+
+def test_invoked_subcommand(runner):
+    @click.group(invoke_without_command=True)
+    @click.pass_context
+    def cli(ctx):
+        if ctx.invoked_subcommand is None:
+            click.echo('no subcommand, use default')
+            ctx.invoke(sync)
+        else:
+            click.echo('invoke subcommand')
+
+    @cli.command()
+    def sync():
+        click.echo('in subcommand')
+
+    result = runner.invoke(cli, ['sync'])
+    assert not result.exception
+    assert result.output == 'invoke subcommand\nin subcommand\n'
+
+    result = runner.invoke(cli)
+    assert not result.exception
+    assert result.output == 'no subcommand, use default\nin subcommand\n'