Start adding tests (don't pass yet)

wpiutil/src/test/native/cpp/telemetry/TelemetryTableTest.cpp

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+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "wpi/telemetry/TelemetryTable.h"  // NOLINT(build/include_order)
+
+#include <gtest/gtest.h>
+
+namespace telemetrytest {
+struct TestStructADL {
+  double x = 0;
+  double y = 0;
+};
+
+void Log(wpi::TelemetryTable& table, const TestStructADL& value) {
+  table.Log("x", value.x);
+  table.Log("y", value.y);
+}
+}  // namespace telemetrytest
+
+TEST(TelemetryTableTest, LogADL) {
+  wpi::TelemetryTable& table = wpi::TelemetryRegistry::GetTable("/");
+  telemetrytest::TestStructADL val;
+  table.Log("testadl", val);
+}
+