Try again with an actual Camera to see if that helps.

Author: nedtwigg

python/example-pytest-selfie/tests/selfie_settings.py

@@ -1,4 +1,4 @@
-from selfie_lib import Snapshot, StringSelfie, expect_selfie
+from selfie_lib import Camera, Snapshot, StringSelfie, expect_selfie
 from werkzeug.test import TestResponse
 
 REDIRECTS = {
@@ -9,14 +9,19 @@
 }
 
 
-def web_selfie(response: TestResponse) -> StringSelfie:
+def web_camera(response: TestResponse) -> Snapshot:
     redirect_reason = REDIRECTS.get(response.status_code)
     if redirect_reason is not None:
-        actual = Snapshot.of(
-            f"REDIRECT {response.status_code} {redirect_reason} to {response.headers.get("Location", "<unknown>")}"
+        return Snapshot.of(
+            f"REDIRECT {response.status_code} {redirect_reason} to "
+            + response.headers.get("Location", "<unknown>")
         )
     else:
-        actual = Snapshot.of(response.data.decode()).plus_facet(
-            "status", response.status
-        )
-    return expect_selfie(actual)
+        return Snapshot.of(response.data.decode()).plus_facet("status", response.status)
+
+
+WEB_CAMERA = Camera.of(web_camera)
+
+
+def web_selfie(response: TestResponse) -> StringSelfie:
+    return expect_selfie(response, WEB_CAMERA)

python/selfie-lib/selfie_lib/Selfie.py

@@ -1,5 +1,6 @@
 from typing import Any, TypeVar, overload
 
+from .Lens import Camera
 from .SelfieImplementations import BinarySelfie, DiskSelfie, ReprSelfie, StringSelfie
 from .Snapshot import Snapshot
 from .SnapshotSystem import _selfieSystem
@@ -23,11 +24,15 @@ def expect_selfie(actual: bytes) -> BinarySelfie: ...
 def expect_selfie(actual: T) -> ReprSelfie[T]: ...
 
 
-def expect_selfie(
-    actual: Any,
-) -> DiskSelfie:
+@overload
+def expect_selfie(actual: T, camera: Camera[T]) -> StringSelfie: ...
+
+
+def expect_selfie(actual: Any, camera: Any = None) -> DiskSelfie:
     disk_storage = _selfieSystem().disk_thread_local()
-    if isinstance(actual, str):
+    if camera is not None:
+        return StringSelfie(camera.snapshot(actual), disk_storage)
+    elif isinstance(actual, str):
         return StringSelfie(Snapshot.of(actual), disk_storage)
     elif isinstance(actual, Snapshot):
         return StringSelfie(actual, disk_storage)