Add tests for 0x00E0 and 0x00EE

src/emu.hpp

@@ -21,6 +21,7 @@ struct EmulatorState {
     uint16_t stack[stack_size] = {};
     int stack_pointer = 0;
 
+    // this is technically 12-bits wide, but of course we dont have access to that :-)
     uint16_t I = 0;
     
     uint8_t v[16] = {};

tests/test.cpp

@@ -4,6 +4,23 @@
 
 #include "emu.hpp"
 
+TEST_CASE("Test 0x0") {
+    state.reset();
+
+    state.pixels[0] = 1;
+
+    // Display clear
+    process_opcode(0x00E0);
+    CHECK(state.pixels[0] == 0);
+
+    state.stack_pointer = 1;
+
+    // Subroutine return
+    process_opcode(0x00EE);
+    CHECK(state.stack_pointer == 0);
+}
+
+
 TEST_CASE("Test 0x1") {
     state.reset();