tests/basics: Split MicroPython-specific deque tests to separate file.

So that the MicroPython-specific behaviour can be isolated, and the CPython
compatible test don't need a .exp file.

Signed-off-by: Damien George <damien@micropython.org>

tests/basics/deque_micropython.py

@@ -0,0 +1,75 @@
+# Test MicroPython-specific features of collections.deque.
+
+try:
+    from collections import deque
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+# Only fixed-size deques are supported, so length arg is mandatory.
+try:
+    deque(())
+except TypeError:
+    print("TypeError")
+
+# Test third argument: flags when True means check for under/overflow
+d = deque((), 2, True)
+
+try:
+    d.popleft()
+except IndexError:
+    print("IndexError")
+
+try:
+    d.pop()
+except IndexError:
+    print("IndexError")
+
+# Removing elements with del is not supported, fallback to
+# mp_obj_subscr() error message.
+try:
+    del d[0]
+except TypeError:
+    print("TypeError")
+
+print(d.append(1))
+print(d.popleft())
+
+d.append(2)
+print(d.popleft())
+
+d.append(3)
+d.append(4)
+print(d.popleft(), d.popleft())
+try:
+    d.popleft()
+except IndexError as e:
+    print(repr(e))
+
+try:
+    d.pop()
+except IndexError as e:
+    print(repr(e))
+
+d.append(5)
+d.append(6)
+print(len(d))
+try:
+    d.append(7)
+except IndexError as e:
+    print(repr(e))
+
+try:
+    d.appendleft(8)
+except IndexError as e:
+    print(repr(e))
+
+print(len(d))
+
+print(d.popleft(), d.popleft())
+print(len(d))
+try:
+    d.popleft()
+except IndexError as e:
+    print(repr(e))