1 files changed, 105 insertions, 0 deletions
diff --git a/src/test/dogecoin_tests.cpp b/src/test/dogecoin_tests.cpp
new file mode 100644
index 000000000..f1d60f709
--- /dev/null
+++ b/src/test/dogecoin_tests.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) 2015-2017 The Dogecoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "arith_uint256.h"
+#include "chainparams.h"
+#include "dogecoin.h"
+#include "test/test_bitcoin.h"
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_FIXTURE_TEST_SUITE(dogecoin_tests, TestingSetup)
+
+/**
+ * the maximum block reward at a given height for a block without fees
+ */
+uint64_t expectedMaxSubsidy(int height) {
+    if (height < 100000) {
+        return 1000000 * COIN;
+    } else if (height < 145000) {
+        return 500000 * COIN;
+    } else if (height < 200000) {
+        return 250000 * COIN;
+    } else if (height < 300000) {
+        return 125000 * COIN;
+    } else if (height < 400000) {
+        return  62500 * COIN;
+    } else if (height < 500000) {
+        return  31250 * COIN;
+    } else if (height < 600000) {
+        return  15625 * COIN;
+    } else {
+        return  10000 * COIN;
+    }
+}
+
+/**
+ * the minimum possible value for the maximum block reward at a given height
+ * for a block without fees
+ */
+uint64_t expectedMinSubsidy(int height) {
+    if (height < 100000) {
+        return 0;
+    } else if (height < 145000) {
+        return 0;
+    } else if (height < 200000) {
+        return 250000 * COIN;
+    } else if (height < 300000) {
+        return 125000 * COIN;
+    } else if (height < 400000) {
+        return  62500 * COIN;
+    } else if (height < 500000) {
+        return  31250 * COIN;
+    } else if (height < 600000) {
+        return  15625 * COIN;
+    } else {
+        return  10000 * COIN;
+    }
+}
+
+BOOST_AUTO_TEST_CASE(subsidy_limit_test)
+{
+    int nHeight = 0;
+    int nStepSize= 1;
+    const auto chainParams = CreateChainParams(CBaseChainParams::MAIN);
+    const auto params = chainParams->GetConsensus();
+    CAmount nSum = 0;
+    uint256 prevHash = uint256S("0");
+
+    for (nHeight = 0; nHeight <= 100000; nHeight++) {
+        CAmount nSubsidy = GetDogecoinBlockSubsidy(nHeight, params, prevHash);
+        BOOST_CHECK(MoneyRange(nSubsidy));
+        BOOST_CHECK(nSubsidy <= 1000000 * COIN);
+        nSum += nSubsidy * nStepSize;
+    }
+    for (; nHeight <= 145000; nHeight++) {
+        CAmount nSubsidy = GetDogecoinBlockSubsidy(nHeight, params, prevHash);
+        BOOST_CHECK(MoneyRange(nSubsidy));
+        BOOST_CHECK(nSubsidy <= 500000 * COIN);
+        nSum += nSubsidy * nStepSize;
+    }
+    for (; nHeight < 600000; nHeight++) {
+        CAmount nSubsidy = GetDogecoinBlockSubsidy(nHeight, params, prevHash);
+        CAmount nExpectedSubsidy = (500000 >> (nHeight / 100000)) * COIN;
+        BOOST_CHECK(MoneyRange(nSubsidy));
+        BOOST_CHECK(nSubsidy == nExpectedSubsidy);
+        nSum += nSubsidy * nStepSize;
+    }
+
+    //test sum +- ~10billion
+    arith_uint256 upperlimit = arith_uint256("95e14ec776380000"); //108 billion doge
+    BOOST_CHECK(nSum <= upperlimit);
+
+    arith_uint256 lowerlimit = arith_uint256("7a1fe16027700000"); //88 billion doge
+    BOOST_CHECK(nSum >= lowerlimit);
+
+    // Test reward at 600k+ is constant
+    CAmount nConstantSubsidy = GetDogecoinBlockSubsidy(600000, params, prevHash);
+    BOOST_CHECK(nConstantSubsidy == 10000 * COIN);
+
+    nConstantSubsidy = GetDogecoinBlockSubsidy(700000, params, prevHash);
+    BOOST_CHECK(nConstantSubsidy == 10000 * COIN);
+}
+
+BOOST_AUTO_TEST_SUITE_END()