Testing that generated CSS rule strings have proper formatting.

== Running test suite: CSS.generateCSSRuleString
-- Running test case: InlineStyleString
#test-node {
    background-color: red;
}

-- Running test case: CSSRuleString0
@media only screen and (min-width: 0px) {
    body > div {
        display: block;
        width: 100%;
        text-align: center;
    }
}

-- Running test case: CSSRuleString1
* {
    margin: 0;
    padding: 0;
}

-- Running test case: CSSRuleString2
address, article, aside, div, footer, header, hgroup, layer, main, nav, section {
}