[qa] Add amount tests

src/Makefile.test.include

@@ -38,6 +38,7 @@ BITCOIN_TESTS =\
   test/scriptnum10.h \
   test/addrman_tests.cpp \
   test/alert_tests.cpp \
+  test/amount_tests.cpp \
   test/allocator_tests.cpp \
   test/base32_tests.cpp \
   test/base58_tests.cpp \

src/test/amount_tests.cpp

@@ -0,0 +1,42 @@
+// Copyright (c) 2016 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "amount.h"
+#include "test/test_bitcoin.h"
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_FIXTURE_TEST_SUITE(amount_tests, BasicTestingSetup)
+
+BOOST_AUTO_TEST_CASE(GetFeeTest)
+{
+    CFeeRate feeRate;
+
+    feeRate = CFeeRate(0);
+    // Must always return 0
+    BOOST_CHECK_EQUAL(feeRate.GetFee(0), 0);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(1e5), 0);
+
+    feeRate = CFeeRate(1000);
+    // Must always just return the arg
+    BOOST_CHECK_EQUAL(feeRate.GetFee(0), 0);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(1), 1);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(121), 121);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(999), 999);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(1e3), 1e3);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(9e3), 9e3);
+
+    feeRate = CFeeRate(123);
+    // Truncates the result, if not integer
+    BOOST_CHECK_EQUAL(feeRate.GetFee(0), 0);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(8), 1); // Special case: returns 1 instead of 0
+    BOOST_CHECK_EQUAL(feeRate.GetFee(9), 1);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(121), 14);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(122), 15);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(999), 122);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(1e3), 123);
+    BOOST_CHECK_EQUAL(feeRate.GetFee(9e3), 1107);
+}
+
+BOOST_AUTO_TEST_SUITE_END()