add password hash test (#4528)

* clangify tests

* add password hash test

* properly use googletest semantics

tests/password_hash_test.cpp

@@ -0,0 +1,39 @@
+#include "../common/passwordhasher.h"
+#include "../common/rng_abstract.h"
+#include "../common/rng_sfmt.h"
+
+#include "gtest/gtest.h"
+
+RNG_Abstract *rng;
+
+namespace
+{
+class PasswordHashTest : public ::testing::Test
+{
+protected:
+    void SetUp() override
+    {
+        rng = new RNG_SFMT;
+    }
+
+    void TearDown() override
+    {
+        delete rng;
+    }
+};
+
+TEST(PasswordHashTest, RegressionTest)
+{
+    QString salt = "saltsaltsaltsalt";
+    QString password = "password";
+    QString expected = "vmKoWv975yf+WT2QCXhW48JNzZ2ghGxdgNvuKLBU0h7s6AQHSG72J6QO4ZswuSeqvBbAXbmgJSRBaSJrgc55WA==";
+    QString hash = PasswordHasher::computeHash(password, salt);
+    ASSERT_EQ(hash, salt + expected) << "The computed hash value remains the same";
+}
+} // namespace
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}