ItemMatcher

ItemMatcher.java

public class ItemMatcher extends TypeSafeMatcher<Item> {

    public static Matcher<Item> item(Item item) {
        return new ItemMatcher(item);
    }

    private Item expected;
    private String fieldName;
    private Object expectedValue;
    private Object actualValue;

    public ItemMatcher(Item expected) {
        this.expected = expected;
    }

    @Override
    protected boolean matchesSafely(Item actual) {
        if (actual == null && expected == null) {
            return true;
        } else if (actual == null || expected == null) {
            return false;
        }
        if (notEquals(actual.id, expected.id)) {
            fieldName = "id";
            actualValue = actual.id;
            expectedValue = expected.id;
            return false;
        }
        if (notEquals(actual.name, expected.name)) {
            fieldName = "name";
            actualValue = actual.name;
            expectedValue = expected.name;
            return false;
        }
        if (notEquals(actual.price, expected.price)) {
            fieldName = "price";
            actualValue = actual.price;
            expectedValue = expected.price;
            return false;
        }
        if (notEquals(actual.description, expected.description)) {
            fieldName = "description";
            actualValue = actual.description;
            expectedValue = expected.description;
            return false;
        }
        return true;
    }

    private boolean notEquals(Object o1, Object o2) {
        if (o1 == null) {
            return o2 != null;
        } else {
            return !o1.equals(o2);
        }
    }

    @Override
    public void describeTo(Description desc) {
        if (fieldName == null || expected == null) {
            desc.appendValue(expected);
        } else {
            desc.appendValue(expected);
            desc.appendText(String.format("%n - %s is ", fieldName)).appendValue(expectedValue).appendText(", but ")
                    .appendValue(actualValue);
        }
    }

}