compile with esp mqtt lib

lib/espMqttClient/test/test_string/test_string.cpp

@@ -0,0 +1,64 @@
+#include <iostream>
+
+#include <unity.h>
+
+#include <Packets/String.h>
+
+void setUp() {}
+void tearDown() {}
+
+void test_encodeString() {
+  const char test[] = "abcd";
+  uint8_t buffer[6];
+  const uint8_t check[] = {0x00, 0x04, 'a', 'b', 'c', 'd'};
+  const uint32_t length = 6;
+
+  TEST_ASSERT_EQUAL_UINT32(length, espMqttClientInternals::encodeString(test, buffer));
+  TEST_ASSERT_EQUAL_UINT8_ARRAY(check, buffer, length);
+}
+
+void test_emtpyString() {
+  const char test[] = "";
+  uint8_t buffer[2];
+  const uint8_t check[] = {0x00, 0x00};
+  const uint32_t length = 2;
+
+  TEST_ASSERT_EQUAL_UINT32(length, espMqttClientInternals::encodeString(test, buffer));
+  TEST_ASSERT_EQUAL_UINT8_ARRAY(check, buffer, length);
+}
+
+void test_longString() {
+  const size_t maxSize = 65535;
+  char test[maxSize + 1];
+  test[maxSize] = '\0';
+  memset(test, 'a', maxSize);
+  uint8_t buffer[maxSize + 3];
+  uint8_t check[maxSize + 2];
+  check[0] = 0xFF;
+  check[1] = 0xFF;
+  memset(&check[2], 'a', maxSize);
+  const uint32_t length = 2 + maxSize;
+
+  TEST_ASSERT_EQUAL_UINT32(length, espMqttClientInternals::encodeString(test, buffer));
+  TEST_ASSERT_EQUAL_UINT8_ARRAY(check, buffer, length);
+}
+
+void test_tooLongString() {
+  const size_t maxSize = 65535;
+  char test[maxSize + 2];
+  test[maxSize + 1] = '\0';
+  memset(test, 'a', maxSize + 1);
+  uint8_t buffer[maxSize + 4];  // extra 4 bytes for headroom: test progam, don't test test
+  const uint32_t length = 0;
+
+  TEST_ASSERT_EQUAL_UINT32(length, espMqttClientInternals::encodeString(test, buffer));
+}
+
+int main() {
+  UNITY_BEGIN();
+  RUN_TEST(test_encodeString);
+  RUN_TEST(test_emtpyString);
+  RUN_TEST(test_longString);
+  RUN_TEST(test_tooLongString);
+  return UNITY_END();
+}