micropython: add micropython component

components/language/micropython/tests/basics/memoryview_gc.py

@@ -0,0 +1,33 @@
+# test memoryview retains pointer to original object/buffer
+try:
+    memoryview
+except:
+    print("SKIP")
+    raise SystemExit
+
+b = bytearray(10)
+m = memoryview(b)[1:]
+for i in range(len(m)):
+    m[i] = i
+
+# reclaim b, but hopefully not the buffer
+b = None
+import gc
+gc.collect()
+
+# allocate lots of memory
+for i in range(100000):
+    [42, 42, 42, 42]
+
+# check that the memoryview is still what we want
+print(list(m))
+
+# check that creating a memoryview of a memoryview retains the underlying data
+m = None
+gc.collect()  # cleanup from previous test
+m = memoryview(memoryview(bytearray(i for i in range(50)))[5:-5])
+print(sum(m), list(m[:10]))
+gc.collect()
+for i in range(10):
+    list(range(10))  # allocate memory to overwrite any reclaimed heap
+print(sum(m), list(m[:10]))