buildman: Add a test for --boards

Add a simple functional test for the --boards option. Fix the example in
the docs while we are here. Also improve the docs for Builder.count so it
is clearer what it contains.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/tools/buildman/func_test.py b/tools/buildman/func_test.py
index 6b6afe7d1c..aaf4cde91e 100644
--- a/tools/buildman/func_test.py
+++ b/tools/buildman/func_test.py
@@ -1047,3 +1047,14 @@ endif
         self._RunControl('-x', 'board2', '-x' 'board4')
         self.assertEqual(['board0', 'board1'],
                          [b.target for b in self._boards.get_selected()])
+
+    def test_single_boards(self):
+        """Test building single boards"""
+        self._RunControl('--boards', 'board1')
+        self.assertEqual(1, self._builder.count)
+
+        self._RunControl('--boards', 'board1', '--boards', 'board2')
+        self.assertEqual(2, self._builder.count)
+
+        self._RunControl('--boards', 'board1,board2', '--boards', 'board4')
+        self.assertEqual(3, self._builder.count)