java abstract number class

java-numbers-3/src/test/java/com/baeldung/abstractnumber/AbstractNumberUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.abstractnumber;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class AbstractNumberUnitTest {
+
+    private final static double DOUBLE_VALUE = 9999.999;
+    private final static float FLOAT_VALUE = 101.99F;
+    private final static long LONG_VALUE = 1000L;
+    private final static int INTEGER_VALUE = 100;
+    private final static short SHORT_VALUE = 127;
+    private final static byte BYTE_VALUE = 120;
+
+    @Test
+    public void givenDoubleValue_whenShortValueUsed_thenShortValueReturned() {
+        Double doubleValue = Double.valueOf(DOUBLE_VALUE);
+        assertEquals(9999, doubleValue.shortValue());
+    }
+
+    @Test
+    public void givenFloatValue_whenByteValueUsed_thenByteValueReturned() {
+        Float floatValue = Float.valueOf(FLOAT_VALUE);
+        assertEquals(101, floatValue.byteValue());
+    }
+
+    @Test
+    public void givenLongValue_whenInitValueUsed_thenInitValueReturned() {
+        Long longValue = Long.valueOf(LONG_VALUE);
+        assertEquals(1000, longValue.intValue());
+    }
+
+    @Test
+    public void givenIntegerValue_whenLongValueUsed_thenLongValueReturned() {
+        Integer integerValue = Integer.valueOf(INTEGER_VALUE);
+        assertEquals(100, integerValue.longValue());
+    }
+
+    @Test
+    public void givenShortValue_whenFloatValueUsed_thenFloatValueReturned() {
+        Short shortValue = Short.valueOf(SHORT_VALUE);
+        assertEquals(127.0F, shortValue.floatValue(), 0);
+    }
+
+    @Test
+    public void givenByteValue_whenDoubleValueUsed_thenDoubleValueReturned() {
+        Byte byteValue = Byte.valueOf(BYTE_VALUE);
+        assertEquals(120.0, byteValue.doubleValue(), 0);
+    }
+
+}