Add unit tests for IBM CRC16.

tests/crc16.cpp

@@ -0,0 +1,54 @@
+//
+// Created by claunia on 5/10/21.
+//
+
+#include <cstdint>
+
+#include "../library.h"
+#include "../crc16.h"
+#include "gtest/gtest.h"
+
+#define EXPECTED_CRC16 0x2d6d
+
+static const uint8_t* buffer;
+
+class crc16Fixture : public ::testing::Test
+{
+  public:
+    crc16Fixture()
+    {
+        // initialization;
+        // can also be done in SetUp()
+    }
+
+  protected:
+    void SetUp()
+    {
+        FILE* file = fopen("/home/claunia/random", "rb");
+        buffer     = (const uint8_t*)malloc(1048576);
+        fread((void*)buffer, 1, 1048576, file);
+        fclose(file);
+    }
+
+    void TearDown() { free((void*)buffer); }
+
+    ~crc16Fixture()
+    {
+        // resources cleanup, no exceptions allowed
+    }
+
+    // shared user data
+};
+
+TEST_F(crc16Fixture, crc16_auto)
+{
+    crc16_ctx* ctx = crc16_init();
+    uint16_t   crc;
+
+    EXPECT_NE(ctx, nullptr);
+
+    crc16_update(ctx, buffer, 1048576);
+    crc16_final(ctx, &crc);
+
+    EXPECT_EQ(crc, EXPECTED_CRC16);
+}