Code review updates

java-numbers-3/src/main/java/com/baeldung/doubletolong/DoubleToLongUnitTest.java

@@ -8,28 +8,28 @@ public class DoubleToLongUnitTest {
     final static double VALUE = 9999.999;
 
     @Test
-    public void using_longValue() {
+    public void givenDoubleValue_whenLongValueCalled_thenLongValueReturned() {
         Assert.assertEquals(9999L, Double.valueOf(VALUE)
             .longValue());
     }
 
     @Test
-    public void using_Math_Round() {
+    public void givenDoubleValue_whenMathRoundUseds_thenLongValueReturned() {
         Assert.assertEquals(10000L, Math.round(VALUE));
     }
 
     @Test
-    public void using_Math_Ceil() {
+    public void givenDoubleValue_whenMathCeilUsed_thenLongValueReturned() {
         Assert.assertEquals(10000L, Math.ceil(VALUE), 0);
     }
 
     @Test
-    public void using_Math_Floor() {
+    public void givenDoubleValue_whenMathFloorUsed_thenLongValueReturned() {
         Assert.assertEquals(9999L, Math.floor(VALUE), 0);
     }
 
     @Test
-    public void using_Type_Cast() {
+    public void givenDoubleValue_whenTypeCasted_thenLongValueReturned() {
         Assert.assertEquals(9999L, (long) VALUE);
     }