refactor: change value generator signature to fix mypy issue

Author: boblat

docs/testing-guide/avm-types.md

@@ -60,8 +60,8 @@ bytes_value = algopy.FixedBytes[typing.Literal[16]](b"Hello, Algorand!")
 # Instantiate test context
 ...
 
-# Generate random byte sequences of length
-random_bytes = context.any.fixed_bytes(length=32)
+# Generate random byte sequences of length 32
+random_bytes = context.any.fixed_bytes(FixedBytes[typing.Literal[32]])
 ```
 
 ## String

src/_algopy_testing/value_generators/avm.py

@@ -18,7 +18,7 @@
 from _algopy_testing.models.account import AccountFields
 from _algopy_testing.models.application import ApplicationContextData, ApplicationFields
 from _algopy_testing.models.asset import AssetFields
-from _algopy_testing.utils import generate_random_int, get_type_generic_from_int_literal
+from _algopy_testing.utils import generate_random_int
 
 if typing.TYPE_CHECKING:
     import algopy
@@ -200,15 +200,18 @@ def bytes(self, length: int | None = None) -> algopy.Bytes:
         length = length or MAX_BYTES_SIZE
         return _algopy_testing.Bytes(secrets.token_bytes(length))
 
-    def fixed_bytes(self, length: _TBytesLength) -> algopy.FixedBytes[_TBytesLength]:
+    def fixed_bytes(
+        self, fixed_bytes_type: type[algopy.FixedBytes[_TBytesLength]]
+    ) -> algopy.FixedBytes[_TBytesLength]:
         """Generate a random fixed byte sequence of a specified length.
 
-        :param length: Length of the fixed byte sequence.
+        :param fixed_bytes_type: The FixedBytes type with length parameter (e.g.,
+            FixedBytes[typing.Literal[10]]).
         :returns: The randomly generated fixed byte sequence.
         """
-
-        length_t = get_type_generic_from_int_literal(length)
-        return _algopy_testing.FixedBytes[length_t](secrets.token_bytes(length))  # type: ignore[valid-type]
+        # Extract the length from the type parameter
+        length = fixed_bytes_type._length
+        return fixed_bytes_type(secrets.token_bytes(length))
 
 
 def _get_app_id(app: algopy.Application | algopy.UInt64 | int) -> int:

tests/value_generators/test_avm.py

@@ -10,6 +10,7 @@
 from _algopy_testing.primitives.bytes import Bytes
 from _algopy_testing.primitives.fixed_bytes import FixedBytes
 from _algopy_testing.primitives.string import String
+from _algopy_testing.utils import get_type_generic_from_int_literal
 
 
 @pytest.fixture()
@@ -66,7 +67,8 @@ def test_avm_bytes_generator(context: AlgopyTestContext, length: int | None) ->
 
 @pytest.mark.parametrize("length", [0, 10, MAX_BYTES_SIZE])
 def test_avm_fixed_bytes_generator(context: AlgopyTestContext, length: int) -> None:
-    value = context.any.fixed_bytes(length)
+    length_t = get_type_generic_from_int_literal(length)
+    value = context.any.fixed_bytes(FixedBytes[length_t])  # type: ignore[valid-type]
     assert isinstance(value, algopy.FixedBytes)
     assert_length(value, length)