diff --git a/src/pow/test/eda_tests.cpp b/src/pow/test/eda_tests.cpp
--- a/src/pow/test/eda_tests.cpp
+++ b/src/pow/test/eda_tests.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <pow/eda.h>
+#include <pow/pow.h>
 
 #include <chain.h>
 #include <chainparams.h>
@@ -74,6 +75,60 @@
         0x1d00e1fdU);
 }
 
+BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_negative_target) {
+    const auto consensus =
+        CreateChainParams(CBaseChainParams::MAIN)->GetConsensus();
+    BlockHash hash;
+    unsigned int nBits;
+    nBits = UintToArith256(consensus.powLimit).GetCompact(true);
+    hash.SetHex("0x1");
+    BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
+}
+
+BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_overflow_target) {
+    const auto consensus =
+        CreateChainParams(CBaseChainParams::MAIN)->GetConsensus();
+    BlockHash hash;
+    unsigned int nBits = ~0x00800000;
+    hash.SetHex("0x1");
+    BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
+}
+
+BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_too_easy_target) {
+    const auto consensus =
+        CreateChainParams(CBaseChainParams::MAIN)->GetConsensus();
+    BlockHash hash;
+    unsigned int nBits;
+    arith_uint256 nBits_arith = UintToArith256(consensus.powLimit);
+    nBits_arith *= 2;
+    nBits = nBits_arith.GetCompact();
+    hash.SetHex("0x1");
+    BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
+}
+
+BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_biger_hash_than_target) {
+    const auto consensus =
+        CreateChainParams(CBaseChainParams::MAIN)->GetConsensus();
+    BlockHash hash;
+    unsigned int nBits;
+    arith_uint256 hash_arith = UintToArith256(consensus.powLimit);
+    nBits = hash_arith.GetCompact();
+    hash_arith *= 2; // hash > nBits
+    hash = BlockHash(ArithToUint256(hash_arith));
+    BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
+}
+
+BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_zero_target) {
+    const auto consensus =
+        CreateChainParams(CBaseChainParams::MAIN)->GetConsensus();
+    BlockHash hash;
+    unsigned int nBits;
+    arith_uint256 hash_arith{0};
+    nBits = hash_arith.GetCompact();
+    hash = BlockHash(ArithToUint256(hash_arith));
+    BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
+}
+
 BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test) {
     DummyConfig config(CBaseChainParams::MAIN);