tests for SetCompact and GetCompact of CBigNum

src/test/bignum_tests.cpp

@@ -122,4 +122,57 @@ BOOST_AUTO_TEST_CASE(bignum_setint64)
     }
 }
 
+
+BOOST_AUTO_TEST_CASE(bignum_SetCompact)
+{
+    CBigNum num;
+    num.SetCompact(0);
+    BOOST_CHECK_EQUAL(num.GetHex(), "0");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0);
+
+    num.SetCompact(0x00123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "0");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0);
+
+    num.SetCompact(0x01123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "12");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x01120000);
+
+    // Make sure that we don't generate compacts with the 0x00800000 bit set
+    num = 0x80;
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x02008000);
+
+    num.SetCompact(0x01fedcba);
+    BOOST_CHECK_EQUAL(num.GetHex(), "-7e");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x01fe0000);
+
+    num.SetCompact(0x02123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "1234");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x02123400);
+
+    num.SetCompact(0x03123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "123456");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x03123456);
+
+    num.SetCompact(0x04123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "12345600");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x04123456);
+
+    num.SetCompact(0x04923456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "-12345600");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x04923456);
+
+    num.SetCompact(0x05009234);
+    BOOST_CHECK_EQUAL(num.GetHex(), "92340000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x05009234);
+
+    num.SetCompact(0x20123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "1234560000000000000000000000000000000000000000000000000000000000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x20123456);
+
+    num.SetCompact(0xff123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "123456000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0xff123456);
+}
+
 BOOST_AUTO_TEST_SUITE_END()