Fix compiler warnings in unit tests. (#488)

tests/unit/test_hmac_sha256.cpp

@@ -67,8 +67,8 @@ void TestHmacSha256(void)
 
     for (int i = 0; tests[i].key != NULL; i++)
     {
-        otCryptoHmacSha256Start(tests[i].key, strlen(tests[i].key));
-        otCryptoHmacSha256Update(tests[i].data, strlen(tests[i].data));
+        otCryptoHmacSha256Start(tests[i].key, static_cast<uint16_t>(strlen(tests[i].key)));
+        otCryptoHmacSha256Update(tests[i].data, static_cast<uint16_t>(strlen(tests[i].data)));
         otCryptoHmacSha256Finish(hash);
 
         VerifyOrQuit(memcmp(hash, tests[i].hash, sizeof(tests[i].hash)) == 0,

tests/unit/test_lowpan.cpp

@@ -83,7 +83,7 @@ void TestLowpanIphc(void)
     Message *message = NULL;
 
     uint8_t  result[1500];
-    unsigned resultLength = 0;
+    uint16_t resultLength = 0;
 
     Mac::Address macSource;
     Mac::Address macDest;
@@ -112,7 +112,7 @@ void TestLowpanIphc(void)
 
         Mac::Frame frame;
         frame.mPsdu = iphcVector.data();
-        frame.mLength = iphcVector.size();
+        frame.mLength = static_cast<uint8_t>(iphcVector.size());
         frame.GetSrcAddr(macSource);
         frame.GetDstAddr(macDest);
 
@@ -126,7 +126,7 @@ void TestLowpanIphc(void)
                                    frame.GetPayloadLength(), 0);
 
         uint16_t ip6PayloadLength = frame.GetPayloadLength() -
-                                    decompressedBytes;
+                                    static_cast<uint16_t>(decompressedBytes);
         SuccessOrQuit(message->Append(frame.GetPayload() + decompressedBytes,
                                       ip6PayloadLength),
                       "6lo: Message::Append failed");
@@ -150,7 +150,7 @@ void TestLowpanIphc(void)
         printf("Compressed OpenThread:\n");
         otTestPrintHex(result, compressBytes);
 
-        VerifyOrQuit(memcmp(frame.GetPayload(), result, compressBytes) == 0,
+        VerifyOrQuit(memcmp(frame.GetPayload(), result, static_cast<size_t>(compressBytes)) == 0,
                      "6lo: Lowpan::Compress failed");
 
         SuccessOrQuit(Message::Free(*message), "6lo: Message:Free failed");

tests/unit/test_message.cpp

@@ -36,7 +36,7 @@ extern"C" void otSignalTaskletPending(void)
 {
 }
 
-extern "C" void otPlatDiagAlarmFired()
+extern "C" void otPlatDiagAlarmFired(void)
 {
 }
 
@@ -50,7 +50,7 @@ void TestMessage(void)
 
     for (unsigned i = 0; i < sizeof(writeBuffer); i++)
     {
-        writeBuffer[i] = random();
+        writeBuffer[i] = static_cast<uint8_t>(random());
     }
 
     VerifyOrQuit((message = Thread::Message::New(Thread::Message::kTypeIp6, 0)) != NULL,

tests/unit/test_ncp_buffer.cpp

@@ -110,7 +110,7 @@ void DumpBuffer(const char *aTextMessage, uint8_t *aBuffer, uint16_t aBufferLeng
     {
         byte = *aBuffer++;
         printf("%02X ", byte);
-        charBuff[counter] = isprint(byte) ? byte : '.';
+        charBuff[counter] = isprint(byte) ? static_cast<char>(byte) : '.';
         counter++;
 
         if (counter == kBytesPerLine)

tests/unit/test_util.cpp

@@ -40,7 +40,7 @@ void otTestHexToVector(std::string &aHex, std::vector<uint8_t> &aOutBytes)
 
     while (ss >> word)
     {
-        uint8_t n = strtol(word.data(), NULL, 16);
+        uint8_t n = static_cast<uint8_t>(strtol(word.data(), NULL, 16));
         aOutBytes.push_back(n);
     }
 }
@@ -63,12 +63,12 @@ void otTestPrintHex(uint8_t *aBuffer, int aLength)
 
 void otTestPrintHex(std::string &aString)
 {
-    otTestPrintHex((uint8_t *)aString.data(), aString.size());
+    otTestPrintHex((uint8_t *)aString.data(), static_cast<int>(aString.size()));
 }
 
 void otTestPrintHex(std::vector<uint8_t> &aBytes)
 {
-    otTestPrintHex((uint8_t *)&aBytes[0], aBytes.size());
+    otTestPrintHex((uint8_t *)&aBytes[0], static_cast<int>(aBytes.size()));
 }