Matchers.java

package uk.co.flyingsquirrels.test;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

public class Matchers {

    public static Matcher<Float> closeTo(float value) {
    	return new IsCloseTo(value, 0.001f);
    }
	
	private static class IsCloseTo extends TypeSafeMatcher<Float> {
	    private final float error;
	    private final float value;

	    public IsCloseTo(float value, float error) {
	        this.error = error;
	        this.value = value;
	    }

	    public boolean matchesSafely(Float item) {
	        return Math.abs((item - value)) <= error;
	    }

	    public void describeTo(Description description) {
	        description.appendText("a numeric value within ")
	                .appendValue(error)
	                .appendText(" of ")
	                .appendValue(value);
	    }

	}
}