Extend test case slightly.

OSBindings/Mac/Clock SignalTests/x86DataPointerTests.mm

@@ -9,6 +9,7 @@
 #import <XCTest/XCTest.h>
 
 #include "../../../InstructionSets/x86/DataPointerResolver.hpp"
+#include <map>
 
 using namespace InstructionSet::x86;
 
@@ -25,47 +26,86 @@ using namespace InstructionSet::x86;
 //}
 
 
-- (void)testX {
-	const DataPointer pointer(
+- (void)test16bitSize1 {
+	const DataPointer indirectPointer(
 		Source::eAX, Source::eDI, 0
 	);
+	const DataPointer registerPointer(
+		Source::eBX
+	);
 
 	struct Registers {
 		uint16_t ax = 0x1234, di = 0x00ee;
+		uint8_t bl = 0xaa;
 
 		template <typename DataT, Register r> DataT read() {
 			assert(is_sized<DataT>(r));
 			switch(r) {
 				case Register::AX:	return ax;
+				case Register::BL:	return bl;
 				case Register::DI:	return di;
 				default: return 0;
 			}
 		}
-		template <typename DataT, Register r> void write(DataT) {
-			assert(false);
+		template <typename DataT, Register r> void write(DataT value) {
+			assert(is_sized<DataT>(r));
+			switch(r) {
+				case Register::BL:	bl = value;	break;
+				default: assert(false);
+			}
 		}
 	} registers;
 
 	struct Memory {
+		std::map<uint32_t, uint8_t> data;
+
 		template<typename DataT> DataT read(Source, uint32_t address) {
 			if(address == 0x1234 + 0x00ee) return 0xff;
 			return 0;
 		}
-		template<typename DataT> void write(Source, uint32_t, DataT) {
-			assert(false);
+		template<typename DataT> void write(Source, uint32_t address, DataT value) {
+			data[address] = value;
 		}
 	} memory;
 
+	// TODO: construct this more formally; the code below just assumes size = 1, which is not a contractual guarantee.
 	const auto instruction = Instruction<false>();
-	const uint8_t value = DataPointerResolver<
-		Model::i8086, Registers, Memory>::read<uint8_t>(
+
+	using Resolver = DataPointerResolver<Model::i8086, Registers, Memory>;
+	const uint8_t memoryValue = Resolver::read<uint8_t>(
 			registers,
 			memory,
 			instruction,
-			pointer
+			indirectPointer
+		);
+	registers.ax = 0x0100;
+	Resolver::write<uint8_t>(
+			registers,
+			memory,
+			instruction,
+			indirectPointer,
+			0xef
 		);
 
-	XCTAssertEqual(value, 0xff);
+	XCTAssertEqual(memoryValue, 0xff);
+	XCTAssertEqual(memory.data[0x01ee], 0xef);
+
+	const uint8_t registerValue = Resolver::read<uint8_t>(
+			registers,
+			memory,
+			instruction,
+			registerPointer
+		);
+	Resolver::write<uint8_t>(
+			registers,
+			memory,
+			instruction,
+			registerPointer,
+			0x93
+		);
+
+	XCTAssertEqual(registerValue, 0xaa);
+	XCTAssertEqual(registers.bl, 0x93);
 }
 
 @end