Add unit tests for SHA1 hashing

test/tests/HashTests.cpp

@@ -0,0 +1,55 @@
+#include <string>
+#include <openrct2/core/Hash.h>
+#include <gtest/gtest.h>
+
+class HashTests : public testing::Test
+{
+public:
+    template<typename T>
+    void AssertHash(std::string expected, T hash)
+    {
+        auto actual = StringToHex(hash);
+        ASSERT_EQ(expected, actual);
+    }
+
+    template<typename T>
+    std::string StringToHex(T input)
+    {
+        std::string result;
+        result.reserve(input.size() * 2);
+        for (auto b : input)
+        {
+            static_assert(sizeof(b) == 1);
+
+            char buf[3];
+            snprintf(buf, 3, "%02x", b);
+            result.append(buf);
+        }
+        return result;
+    }
+};
+
+TEST_F(HashTests, SHA1_Basic)
+{
+    std::string input = "The quick brown fox jumped over the lazy dog.";
+    auto result = Hash::SHA1(input.data(), input.size());
+    AssertHash("c0854fb9fb03c41cce3802cb0d220529e6eef94e", result);
+}
+
+TEST_F(HashTests, SHA1_Multiple)
+{
+    std::string input[] = {
+        "Merry-go-round 2 looks too intense for me",
+        "This park is really clean and tidy",
+        "This balloon from Balloon Stall 1 is really good value"
+    };
+
+    auto alg = Hash::CreateSHA1();
+    for (auto s : input)
+    {
+        alg->Update(s.data(), s.size());
+    }
+    auto result = alg->Finish();
+
+    AssertHash("758a238d9a4748f80cc81f12be3885d5e45d34c2", result);
+}