Add NumberFormatter unit test

src/com/jasonlam604/stocktechnicals/util/NumberFormatter.java

@@ -5,14 +5,17 @@
 
 public class NumberFormatter {
 
+	private NumberFormatter() {
+	}
+
 	public static double round(double value) {
-		return NumberFormatter.round(value,2);
+		return NumberFormatter.round(value, 2);
 	}
-	
+
 	public static double round(double value, int numberOfDigitsAfterDecimalPoint) {
-        BigDecimal bigDecimal = new BigDecimal(value);
-        bigDecimal = bigDecimal.setScale(numberOfDigitsAfterDecimalPoint, BigDecimal.ROUND_HALF_UP);
-        return bigDecimal.doubleValue();
-    }
+		BigDecimal bigDecimal = new BigDecimal(value);
+		bigDecimal = bigDecimal.setScale(numberOfDigitsAfterDecimalPoint, BigDecimal.ROUND_HALF_UP);
+		return bigDecimal.doubleValue();
+	}
 
 }

test/com/jasonlam604/stocktechnicals/util/NumberFormatterTest.java

@@ -0,0 +1,25 @@
+package com.jasonlam604.stocktechnicals.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class NumberFormatterTest {
+
+	@Test
+	public void roundingTwoDecimals() {
+		Assert.assertEquals(10, NumberFormatter.round(10), 0);
+		Assert.assertEquals(1, NumberFormatter.round(1), 0);
+		Assert.assertEquals(1.1, NumberFormatter.round(1.1), 0);
+		Assert.assertEquals(1.14, NumberFormatter.round(1.144), 0);
+		Assert.assertEquals(1.15, NumberFormatter.round(1.145), 0);
+		Assert.assertEquals(1.20, NumberFormatter.round(1.19555555), 0);
+	}
+
+	@Test
+	public void roundingWithIndicateDecimalPoints() {
+		Assert.assertEquals(1, NumberFormatter.round(1.19555555, 0), 0);
+		Assert.assertEquals(1.2, NumberFormatter.round(1.19555555, 1), 0);
+		Assert.assertEquals(1.20, NumberFormatter.round(1.19555555, 2), 0);
+		Assert.assertEquals(1.196, NumberFormatter.round(1.19555555, 3), 0);
+	}
+}