KEEP-49: extending Kotlin API for BigInteger and BigDecimal

libraries/stdlib/test/numbers/MathJVMTest.kt

@@ -20,6 +20,24 @@ class MathTest {
         assertEquals(BigInteger("-2"), -a % b)
         assertEquals(BigInteger("1"), (-a).mod(b))
         assertEquals(BigInteger("-2"), (-a).remainder(b))
+
+        assertEquals(BigInteger("3"), a.inc())
+        assertEquals(BigInteger("1"), a.dec())
+        assertEquals(BigInteger("-3"), a.inv())
+        assertEquals(BigInteger("2"), a and b)
+        assertEquals(BigInteger("3"), a or b)
+        assertEquals(BigInteger("1"), a xor b)
+        assertEquals(BigInteger("4"), a shl 1)
+        assertEquals(BigInteger("1"), a shr 1)
+        assertEquals(BigInteger("-4"), -a shl 1)
+        assertEquals(BigInteger("-1"), -a shr 1)
+
+        assertEquals(BigInteger("2"), "2".toBigInteger())
+        assertEquals(BigInteger("-3"), "-3".toBigInteger())
+        assertEquals(BigInteger("2"),  2.toBigInteger())
+        assertEquals(BigInteger("-3"), -3L.toBigInteger())
+
+        assertEquals(BigDecimal("2"), a.toBigDecimal())
     }
 
     @Test fun testBigDecimal() {
@@ -34,10 +52,33 @@ class MathTest {
         assertEquals(BigDecimal("-2"), -a % b)
         assertEquals(BigDecimal("-2"), (-a).mod(b))
         assertEquals(BigDecimal("-2"), (-a).rem(b))
+
+        assertEquals(BigDecimal("3"), a.inc())
+        assertEquals(BigDecimal("1"), a.dec())
+
+        assertEquals(BigDecimal("2.5"), "2.5".toBigDecimal())
+        assertEquals(BigDecimal("-3"), "-3".toBigDecimal())
+        assertEquals(BigDecimal("2"),  2.toBigDecimal())
+        assertEquals(BigDecimal("-3"), -3L.toBigDecimal())
+        assertEquals(BigDecimal("2.0"), 2f.toBigDecimal())
+        assertEquals(BigDecimal("0.5"),  0.5.toBigDecimal())
+    }
+
+    @Test fun mutatingBigNumbers() {
+        var a = 2.toBigInteger()
+        var b = "1.5".toBigDecimal()
+
+        a++
+        b++
+
+        assertEquals(BigInteger("3"), a)
+        assertEquals(BigDecimal("2.5"), b)
+
+        --a
+        --b
+
+        assertEquals(BigInteger("2"), a)
+        assertEquals(BigDecimal("1.5"), b)
     }
 }
 
-fun main(args: Array<String>) {
-    MathTest().testBigInteger()
-    MathTest().testBigDecimal()
-}