Add unit test for MAX_POOL op for quant8.

Bug: 63905942
Test: NeuralNetworksTest on Angler
Change-Id: I9988a4e0b90d598a153069970fe5368fa2284f89
diff --git a/runtime/test/specs/max_pool_quant8.mod.py b/runtime/test/specs/max_pool_quant8.mod.py
new file mode 100644
index 0000000..5b85c6b
--- /dev/null
+++ b/runtime/test/specs/max_pool_quant8.mod.py
@@ -0,0 +1,14 @@
+# model
+model = Model()
+i1 = Input("op1", "TENSOR_QUANT8_ASYMM", "0.0f, 127.5f, {1, 2, 2, 1}") # input 0
+cons1 = Int32Scalar("cons1", 1)
+act = Int32Scalar("act", 0)
+i3 = Output("op3", "TENSOR_QUANT8_ASYMM", "0.0f, 127.5f, {1, 2, 2, 1}") # output 0
+model = model.Operation("MAX_POOL_2D", i1, cons1, cons1, cons1, cons1, cons1, act).To(i3)
+# Example 1. Input in operand 0,
+input0 = {i1: # input 0
+          [1, 2, 3, 4]}
+output0 = {i3: # output 0
+          [1, 2, 3, 4]}
+# Instantiate an example
+Example((input0, output0))