Added tests for NumberUtilsTest

eco-api/src/test/java/NumberUtilsTest.java

@@ -0,0 +1,24 @@
+import com.willfp.eco.util.NumberUtils;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class NumberUtilsTest {
+    @Test
+    public void testFormatDouble() {
+        Assertions.assertEquals(NumberUtils.format(3.0D), "3");
+        Assertions.assertEquals(NumberUtils.format(3.2D), "3.20");
+    }
+
+    @Test
+    public void testLog2() {
+        Assertions.assertEquals(NumberUtils.log2(2), 1);
+    }
+
+    @Test
+    public void testNumerals() {
+        Assertions.assertEquals(NumberUtils.fromNumeral("IV"), 4);
+        Assertions.assertEquals(NumberUtils.fromNumeral("IX"), 9);
+        Assertions.assertEquals(NumberUtils.toNumeral(14), "XIV");
+        Assertions.assertEquals(NumberUtils.toNumeral(21), "XXI");
+    }
+}