Add file structure for automatic unit-testing

tests/bus/test-i2c.c

@@ -0,0 +1 @@
+static void *TODO;

tests/bus/test-mosfet.c

@@ -0,0 +1 @@
+static void *TODO;

tests/bus/test-pwm.c

@@ -0,0 +1 @@
+static void *TODO;

tests/bus/test-usart.c

@@ -0,0 +1 @@
+static void *TODO;

tests/common/test-math.c

@@ -0,0 +1 @@
+static void *TODO;

tests/common/test-memory.c

@@ -0,0 +1 @@
+static void *TODO;

tests/common/test-parser.c

@@ -0,0 +1 @@
+static void *TODO;

tests/main.c

@@ -0,0 +1,10 @@
+// TODO: Automatic unit-testing.
+
+int main(void)
+{
+	// 1. Write unit-tests.
+	// 2. Run them.
+	// 3. Profit!
+
+	return 0;
+}