Add test cases for a helper function in controller manager

cmd/controller-manager/app/helper_test.go

@@ -60,6 +60,20 @@ func TestIsControllerEnabled(t *testing.T) {
 			disabledByDefaultControllers: []string{"delta", "echo"},
 			expected:                     false,
 		},
+		{
+			name:                         "on by star, not off by name",
+			controllerName:               "alpha",
+			controllers:                  []string{"*", "-charlie"},
+			disabledByDefaultControllers: []string{"delta", "echo"},
+			expected:                     true,
+		},
+		{
+			name:                         "off by name with star",
+			controllerName:               "charlie",
+			controllers:                  []string{"*", "-charlie"},
+			disabledByDefaultControllers: []string{"delta", "echo"},
+			expected:                     false,
+		},
 		{
 			name:                         "off by default implicit, no star",
 			controllerName:               "foxtrot",