Changed AnalogChannel to AnalogInput, added AnalogOutput for MXP

Change-Id: I863d89c61ff2cf4a7a3aeeca1296978e728758b6

wpilibc/wpilibC++IntegrationTests/src/AnalogLoopTest.cpp

@@ -0,0 +1,52 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2014. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "WPILib.h"
+#include "gtest/gtest.h"
+#include "TestBench.h"
+
+static const double kDelayTime = 0.05;
+
+/**
+ * A fixture with an analog input and an analog output wired together
+ */
+class AnalogLoopTest : public testing::Test {
+protected:
+    AnalogInput *m_input;
+    AnalogOutput *m_output;
+
+    virtual void SetUp() {
+        m_input = new AnalogInput(TestBench::kFakeAnalogOutputChannel);
+        m_output = new AnalogOutput(TestBench::kAnalogOutputChannel);
+    }
+
+    virtual void TearDown() {
+        delete m_input;
+        delete m_output;
+    }
+
+    void Reset() {
+        m_output->SetVoltage(0.0f);
+    }
+};
+
+/**
+ * Test analog inputs and outputs by setting one and making sure the other
+ * matches.
+ */
+TEST_F(AnalogLoopTest, Loop) {
+    Reset();
+
+    // Set the output voltage and check if the input measures the same voltage
+    for(int i = 0; i < 50; i++) {
+        m_output->SetVoltage(i / 10.0f);
+
+        Wait(kDelayTime);
+
+        EXPECT_NEAR(m_output->GetVoltage(), m_input->GetVoltage(), 0.01f);
+    }
+}