### Question:
CssUtils { public float getLeftAndRightMargin(final Tag t, final float pageWidth) { float horizontalMargin = 0; String value = t.getCSS().get(CSS.Property.MARGIN_LEFT); if (value != null) { horizontalMargin += parseValueToPt(value, pageWidth); } value = t.getCSS().get(CSS.Property.MARGIN_RIGHT); if (value != null) { horizontalMargin += parseValueToPt(value, pageWidth); } return horizontalMargin; } private  CssUtils(); static CssUtils getInstance(); Map<String, String> parseBoxValues(final java.lang.String box,
                                             final java.lang.String pre, final java.lang.String post); Map<String, String> parseBoxValues(final String box,
                                              final String pre, final String post, String preKey); Map<String, String> parseBorder(final String border); Map<String, String> parseBorder(final String border, final String borderKey); String stripDoubleSpacesAndTrim(final String str); String stripDoubleSpacesTrimAndToLowerCase(final String str); Map<String, String> processBackground(final String background); Map<String, String> processListStyle(final String listStyle); Map<String, String> processFont(final String font); float checkMetricStyle(final Tag t, final String style); Float checkMetricStyle(final Map<String,String> css, final String style); boolean isMetricValue(final String value); boolean isRelativeValue(final String value); boolean isNumericValue(final String value); float parseValueToPt(final String value, final float baseValue); float parseRelativeValue(final String relativeValue, final float baseValue); float parsePxInCmMmPcToPt(final String length, final String defaultMetric); float parsePxInCmMmPcToPt(final String length); int determinePositionBetweenValueAndUnit(final String string); float getLeftAndRightMargin(final Tag t, final float pageWidth); String extractUrl(final String url); float validateTextHeight(final Map<String, String> css,
			float textHeight); float calculateMarginTop(final String value, final float largestFont, final MarginMemory configuration); float calculateMarginTop(final float value, final MarginMemory configuration); String trimAndRemoveQuoutes(String s); String[] splitComplexCssStyle(String s); static final int DEFAULT_FONT_SIZE_PT; }### Answer:
@Test public void calculateHorizontalMargin() { Tag t = new Tag(string); t.getCSS().put("margin-left", "15pt"); t.getCSS().put("margin-right", "15pt"); Assert.assertEquals(30, css.getLeftAndRightMargin(t, 0f), 0); }