[Test] add negative-valued int32 testcases to packedbytearray

tests/fpgadataflow/test_data_packing.py

@@ -153,6 +153,12 @@ def test_finnpy_to_packed_bytearray():
     D = [[1, 7, 2, 5], [2, 5, 1, 7]]
     eD = np.asarray([[23, 37], [37, 23]], dtype=np.uint8)
     assert (finnpy_to_packed_bytearray(D, DataType.UINT4) == eD).all()
+    E = [[-4, 0, -4, -4]]
+    eE = np.asarray(
+        [[255, 255, 255, 252, 0, 0, 0, 0, 255, 255, 255, 252, 255, 255, 255, 252]],
+        dtype=np.uint8,
+    )
+    assert (finnpy_to_packed_bytearray(E, DataType.INT32) == eE).all()
 
 
 def test_packed_bytearray_to_finnpy():
@@ -176,3 +182,11 @@ def test_packed_bytearray_to_finnpy():
     eD = np.asarray(eD, dtype=np.float32)
     shapeD = eD.shape
     assert (packed_bytearray_to_finnpy(D, DataType.UINT4, shapeD) == eD).all()
+    E = np.asarray(
+        [[255, 255, 255, 252, 0, 0, 0, 0, 255, 255, 255, 252, 255, 255, 255, 252]],
+        dtype=np.uint8,
+    )
+    eE = [[-4, 0, -4, -4]]
+    eE = np.asarray(eE, dtype=np.float32)
+    shapeE = eE.shape
+    assert (packed_bytearray_to_finnpy(E, DataType.INT32, shapeE) == eE).all()