Added number to word converter

test/zutil/test/NumberToWordsConverterTest.java

@@ -0,0 +1,72 @@
+package zutil.test;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+import zutil.converters.NumberToWordsConverter;
+
+
+@RunWith(Parameterized.class)
+public class NumberToWordsConverterTest {
+		
+	@Parameters
+	public static Collection<Object[]> parameters() {		
+		Object[][] data = new Object[][] {
+			{-77,  "minus seventy seven"}
+			, {-2, "minus two"}
+			, {1,  "one"}
+			, {0,  "zero"}
+			, {7,  "seven"}
+			, {11, "eleven"}
+			, {12, "twelve"}
+			, {17, "seventeen"}
+			, {20, "twenty"}
+			, {21, "twenty one"}
+			, {23, "twenty three"}
+			, {25, "twenty five"}
+			, {30, "thirty"}
+			, {34, "thirty four"}
+			, {50, "fifty"}
+			, {70, "seventy"}
+			, {100, "one hundred"}
+			, {110, "one hundred ten"}
+			, {131, "one hundred thirty one"}
+			, {222, "two hundred twenty two"}
+			, {1000, "one thousand"}
+			, {10_000, "ten thousand"}
+			, {100_000, "one hundred thousand"}
+			, {1000_000, "one million"}
+			, {10_000_000, "ten million"}
+			, {Integer.MAX_VALUE, "two billion one hundred forty seven million four hundred eighty three thousand six hundred forty seven"}
+			, {Integer.MIN_VALUE, "minus two billion one hundred forty seven million four hundred eighty three thousand six hundred forty eight"}
+			};
+		return Arrays.asList(data);
+	}
+	
+	
+	private int input;
+	private String expected;
+	
+
+	public NumberToWordsConverterTest(int input, String expected) {
+		this.input = input;
+		this.expected = expected;
+	}
+
+	@Test
+	public void testConvert() {
+		assertThat(new NumberToWordsConverter().convert(input)
+													, is(equalTo(expected)));
+	}
+
+}
+	
+