diff --git a/tests/insn/test_alu8.py b/tests/insn/test_alu8.py
index eadb2d7..9a359b6 100644
--- a/tests/insn/test_alu8.py
+++ b/tests/insn/test_alu8.py
@@ -53,8 +53,71 @@ def test_add_a_hl():
     assert cpu.cycles == 16
 
 
-# TODO: ADC_A_R, ADC_A_N, ADC_A_HL, SUB_A_R, SUB_A_N, SUB_A_HL, SBC_A_R,
-# SBC_A_N, SBC_A_HL
+@pytest.mark.parametrize("r", set(R8) - {R8.A})
+def test_adc_a_r(r):
+    cpu = CPU()
+    cpu.set_reg8(r, 0x7F)
+
+    ADC_A_R(r).exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 0x7F
+    assert cpu.carry == 0
+    assert cpu.cycles == 4
+
+    cpu.set_reg8(r, 0x81)
+    ADC_A_R(r).exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 0x00
+    assert cpu.carry == 1
+    assert cpu.cycles == 8
+
+    cpu.set_reg8(r, 0x00)
+    ADC_A_R(r).exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 0x01
+    assert cpu.carry == 0
+    assert cpu.cycles == 12
+
+
+@pytest.mark.parametrize("n", n8())
+def test_adc_a_n(n):
+    cpu = CPU()
+    cpu.set_reg8(R8.A, 0x7F)
+
+    ADC_A_N(n).exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == (0x7F + n) & 0xFF
+    assert cpu.carry == (1 if n >= 0x81 else 0)
+    assert cpu.cycles == 8
+
+
+def test_adc_a_hl():
+    cpu = CPU()
+    cpu.set_reg16(R16.HL, 0x1234)
+    cpu.deref_hl_set(0x7F)
+
+    ADC_A_HL().exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 0x7F
+    assert cpu.carry == 0
+    assert cpu.cycles == 8
+
+    cpu.deref_hl_set(0x81)
+    ADC_A_HL().exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 0
+    assert cpu.carry == 1
+    assert cpu.cycles == 16
+
+    cpu.deref_hl_set(0x00)
+    ADC_A_HL().exec(cpu)
+
+    assert cpu.get_reg8(R8.A) == 1
+    assert cpu.carry == 0
+    assert cpu.cycles == 24
+
+
+# TODO: SUB_A_R, SUB_A_N, SUB_A_HL, SBC_A_R, SBC_A_N, SBC_A_HL
 
 
 @pytest.mark.parametrize("r", set(R8) - {R8.A})