tests/basics: Add more list tests to improve coverage testing.

tests/basics/list1.py

@@ -22,3 +22,9 @@ print(x)
 print(x[1:])
 print(x[:-1])
 print(x[2:3])
+
+# unsupported type on RHS of add
+try:
+    [] + None
+except TypeError:
+    print('TypeError')

tests/basics/list_mult.py

@@ -10,3 +10,9 @@ for i in (-4, -2, 0, 2, 4):
 a = [1, 2, 3]
 c = a * 3
 print(a, c)
+
+# unsupported type on RHS
+try:
+    [] * None
+except TypeError:
+    print('TypeError')

tests/basics/list_pop.py

@@ -9,3 +9,9 @@ except IndexError:
     print("IndexError raised")
 else:
     raise AssertionError("No IndexError raised")
+
+# popping such that list storage shrinks (tests implementation detail of uPy)
+l = list(range(20))
+for i in range(len(l)):
+    l.pop()
+print(l)