6 files changed, 9 insertions, 9 deletions
diff --git a/src/test/base58_tests.cpp b/src/test/base58_tests.cpp
index b33cdb9fe6..ee633249e9 100644
--- a/src/test/base58_tests.cpp
+++ b/src/test/base58_tests.cpp
@@ -78,7 +78,7 @@ class TestAddrTypeVisitor : public boost::static_visitor<bool>
 private:
     std::string exp_addrType;
 public:
-    TestAddrTypeVisitor(const std::string &_exp_addrType) : exp_addrType(_exp_addrType) { }
+    explicit TestAddrTypeVisitor(const std::string &_exp_addrType) : exp_addrType(_exp_addrType) { }
     bool operator()(const CKeyID &id) const
     {
         return (exp_addrType == "pubkey");
@@ -99,7 +99,7 @@ class TestPayloadVisitor : public boost::static_visitor<bool>
 private:
     std::vector<unsigned char> exp_payload;
 public:
-    TestPayloadVisitor(std::vector<unsigned char> &_exp_payload) : exp_payload(_exp_payload) { }
+    explicit TestPayloadVisitor(std::vector<unsigned char> &_exp_payload) : exp_payload(_exp_payload) { }
     bool operator()(const CKeyID &id) const
     {
         uint160 exp_key(exp_payload);
diff --git a/src/test/bip32_tests.cpp b/src/test/bip32_tests.cpp
index 6bcd550d7b..c851ab2849 100644
--- a/src/test/bip32_tests.cpp
+++ b/src/test/bip32_tests.cpp
@@ -24,7 +24,7 @@ struct TestVector {
     std::string strHexMaster;
     std::vector<TestDerivation> vDerive;
 
-    TestVector(std::string strHexMasterIn) : strHexMaster(strHexMasterIn) {}
+    explicit TestVector(std::string strHexMasterIn) : strHexMaster(strHexMasterIn) {}
 
     TestVector& operator()(std::string pub, std::string prv, unsigned int nChild) {
         vDerive.push_back(TestDerivation());
diff --git a/src/test/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index 812e8534cd..f2d5b385d0 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -118,12 +118,12 @@ public:
     std::vector<uint64_t> shorttxids;
     std::vector<PrefilledTransaction> prefilledtxn;
 
-    TestHeaderAndShortIDs(const CBlockHeaderAndShortTxIDs& orig) {
+    explicit TestHeaderAndShortIDs(const CBlockHeaderAndShortTxIDs& orig) {
         CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
         stream << orig;
         stream >> *this;
     }
-    TestHeaderAndShortIDs(const CBlock& block) :
+    explicit TestHeaderAndShortIDs(const CBlock& block) :
         TestHeaderAndShortIDs(CBlockHeaderAndShortTxIDs(block, true)) {}
 
     uint64_t GetShortID(const uint256& txhash) const {
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index 37ddf83f5e..dc358bff95 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -74,7 +74,7 @@ public:
 class CCoinsViewCacheTest : public CCoinsViewCache
 {
 public:
-    CCoinsViewCacheTest(CCoinsView* _base) : CCoinsViewCache(_base) {}
+    explicit CCoinsViewCacheTest(CCoinsView* _base) : CCoinsViewCache(_base) {}
 
     void SelfTest() const
     {
diff --git a/src/test/dbwrapper_tests.cpp b/src/test/dbwrapper_tests.cpp
index 6ed6e7744e..251d5a7142 100644
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -231,7 +231,7 @@ struct StringContentsSerializer {
     // This is a terrible idea
     std::string str;
     StringContentsSerializer() {}
-    StringContentsSerializer(const std::string& inp) : str(inp) {}
+    explicit StringContentsSerializer(const std::string& inp) : str(inp) {}
 
     StringContentsSerializer& operator+=(const std::string& s) {
         str += s;
diff --git a/src/test/test_bitcoin.h b/src/test/test_bitcoin.h
index dd3b13c8c8..2ddac2f076 100644
--- a/src/test/test_bitcoin.h
+++ b/src/test/test_bitcoin.h
@@ -41,7 +41,7 @@ static inline bool InsecureRandBool() { return insecure_rand_ctx.randbool(); }
 struct BasicTestingSetup {
     ECCVerifyHandle globalVerifyHandle;
 
-    BasicTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    explicit BasicTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
     ~BasicTestingSetup();
 };
 
@@ -56,7 +56,7 @@ struct TestingSetup: public BasicTestingSetup {
     CConnman* connman;
     CScheduler scheduler;
 
-    TestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    explicit TestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
     ~TestingSetup();
 };