[examples] Add unit testing infrastructure (#4646)

wpilibcExamples/src/main/cpp/examples/UnitTest/include/subsystems/Intake.h

@@ -0,0 +1,24 @@
+// 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.
+
+#pragma once
+
+#include <frc/DoubleSolenoid.h>
+#include <frc/motorcontrol/PWMSparkMax.h>
+
+#include "Constants.h"
+
+class Intake {
+ public:
+  void Deploy();
+  void Retract();
+  void Activate(double speed);
+  bool IsDeployed() const;
+
+ private:
+  frc::PWMSparkMax m_motor{IntakeConstants::kMotorPort};
+  frc::DoubleSolenoid m_piston{frc::PneumaticsModuleType::CTREPCM,
+                               IntakeConstants::kPistonFwdChannel,
+                               IntakeConstants::kPistonRevChannel};
+};