when(atRuleNameNode.getValue()).thenReturn("external");
List<CssValueNode> parameters = Lists.newArrayList(stringNode("*"));
when(atRuleParameters.getValues()).thenReturn(parameters);
externalClassesCollector.leaveUnknownAtRule(cssUnknownAtRuleNode);
reset(mutatingVisitController);
CssUnknownAtRuleNode secondAtRuleNode = mock(CssUnknownAtRuleNode.class);
CssLiteralNode secondAtRuleNameNode = mock(CssLiteralNode.class);
when(secondAtRuleNameNode.getValue()).thenReturn("external");
when(secondAtRuleNode.getName()).thenReturn(secondAtRuleNameNode);
// When
externalClassesCollector.leaveUnknownAtRule(secondAtRuleNode);
// Then