tests/micropython: Switch from set.pop to raise-0 to test exc strings.

To not rely on sets, which are an optional feature.

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

Author: dpgeorge

tests/micropython/heapalloc_exc_compressed.py

@@ -5,21 +5,19 @@
 # mp_obj_new_exception_msg (decompression can be deferred)
 
 # NameError uses mp_obj_new_exception_msg_varg for NameError("name '%q' isn't defined")
-# set.pop uses mp_obj_new_exception_msg for KeyError("pop from an empty set")
+# `raise 0` uses mp_obj_new_exception_msg for TypeError("exceptions must derive from BaseException")
 
 # Tests that deferred decompression works both via print(e) and accessing the message directly via e.args.
 
-a = set()
-
 # First test the regular case (can use heap for allocating the decompression buffer).
 try:
     name()
 except NameError as e:
     print(type(e).__name__, e)
 
 try:
-    a.pop()
-except KeyError as e:
+    raise 0
+except TypeError as e:
     print(type(e).__name__, e)
 
 try:
@@ -28,8 +26,8 @@
     print(e.args[0])
 
 try:
-    a.pop()
-except KeyError as e:
+    raise 0
+except TypeError as e:
     print(e.args[0])
 
 # Then test that it still works when the heap is locked (i.e. in ISR context).
@@ -41,8 +39,8 @@
     print(type(e).__name__)
 
 try:
-    a.pop()
-except KeyError as e:
+    raise 0
+except TypeError as e:
     print(type(e).__name__)
 
 micropython.heap_unlock()

tests/micropython/heapalloc_exc_compressed.py.exp

@@ -1,6 +1,6 @@
 NameError name 'name' isn't defined
-KeyError pop from an empty set
+TypeError exceptions must derive from BaseException
 name 'name' isn't defined
-pop from an empty set
+exceptions must derive from BaseException
 NameError
-KeyError
+TypeError

tests/micropython/heapalloc_exc_compressed_emg_exc.py

@@ -9,8 +9,6 @@
 except AttributeError:
     pass
 
-a = set()
-
 
 def test():
     micropython.heap_lock()
@@ -21,8 +19,8 @@ def test():
         print(type(e).__name__, e)
 
     try:
-        a.pop()
-    except KeyError as e:
+        raise 0
+    except TypeError as e:
         print(type(e).__name__, e)
 
     try:
@@ -31,8 +29,8 @@ def test():
         print(e.args[0])
 
     try:
-        a.pop()
-    except KeyError as e:
+        raise 0
+    except TypeError as e:
         print(e.args[0])
 
     micropython.heap_unlock()

tests/micropython/heapalloc_exc_compressed_emg_exc.py.exp

@@ -1,4 +1,4 @@
 NameError name 'name' isn't defined
-KeyError pop from an empty set
+TypeError exceptions must derive from BaseException
 name 'name' isn't defined
-pop from an empty set
+exceptions must derive from BaseException