Add unit tests for C drivers

1 files changed, 34 insertions, 0 deletions

diff --git a/devices/uart/sys_io.hh b/devices/uart/sys_io.hh
new file mode 100644
index 0000000..142c9c1
--- /dev/null
+++ b/devices/uart/sys_io.hh
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <gmock/gmock.h>
+
+class IPort {
+public:
+  virtual unsigned char inb(unsigned short) const = 0;
+  virtual void outb(unsigned char, unsigned short) const = 0;
+};
+
+class MockPort : public IPort {
+public:
+  MOCK_METHOD(unsigned char, inb, (unsigned short), (const, override));
+  MOCK_METHOD(void, outb, (unsigned char, unsigned short), (const, override));
+};
+
+static std::unique_ptr<MockPort> mockPort;
+
+// mock free functions
+extern "C" {
+unsigned char
+inb(unsigned short v)
+{
+  EXPECT_TRUE(mockPort) << "MockPort was not set up by the test fixture";
+  return mockPort->inb(v);
+}
+
+void
+outb(unsigned char p, unsigned short v)
+{
+  EXPECT_TRUE(mockPort) << "MockPort was not set up by the test fixture";
+  return mockPort->outb(p, v);
+}
+}