InstanceView: Add feature flag tests

test/pleroma/web/mastodon_api/views/instance_view_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2026 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MastodonAPI.InstanceViewTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Language.LanguageDetectorMock
+  alias Pleroma.StaticStubbedConfigMock
+  alias Pleroma.Web.MastodonAPI.InstanceView
+
+  import Mox
+
+  @features [
+    "pleroma_api",
+    "mastodon_api",
+    "mastodon_api_grouped_notifications",
+    "mastodon_api_streaming",
+    "polls",
+    "v2_suggestions",
+    "pleroma_explicit_addressing",
+    "shareable_emoji_packs",
+    "multifetch",
+    "pleroma:api/v1/notifications:include_types_filter",
+    "editing",
+    "quote_posting",
+    "pleroma_emoji_reactions",
+    "pleroma_custom_emoji_reactions",
+    "pleroma_chat_messages",
+    "pleroma:pin_chats",
+    "pleroma:get:main/ostatus",
+    "pleroma:group_actors",
+    "pleroma:bookmark_folders",
+    "pleroma:block_expiration"
+  ]
+
+  @configureable_features [
+    "blockers_visible",
+    "media_proxy",
+    "gopher",
+    "chat",
+    "shout",
+    "relay",
+    "safe_dm_mentions",
+    "exposable_reactions",
+    "profile_directory",
+    "pleroma:language_detection"
+  ]
+  @configurable_features_flags [
+    [:activitypub, :blockers_visible],
+    [:media_proxy, :enabled],
+    [:gopher, :enabled],
+    [:shout, :enabled],
+    [:instance, :allow_relay],
+    [:instance, :safe_dm_mentions],
+    [:instance, :show_reactions],
+    [:instance, :profile_directory]
+  ]
+
+  # When this fails, a new feature flag was probably added. Add it to the macros above.
+  describe "uncofigurable features" do
+    setup do
+      Enum.each(@configurable_features_flags, &clear_config(&1, false))
+    end
+
+    test "returns always enabled features" do
+      features = @features
+
+      assert Enum.sort(InstanceView.features()) == Enum.sort(features)
+    end
+  end
+
+  describe "all features" do
+    setup do
+      Enum.each(@configurable_features_flags, &clear_config(&1, true))
+
+      # Stub the StaticStubbedConfigMock to return our mock for the provider
+      StaticStubbedConfigMock
+      |> stub(:get, fn
+        [Pleroma.Language.LanguageDetector, :provider] -> LanguageDetectorMock
+        _other -> nil
+      end)
+
+      # Stub the LanguageDetectorMock with default implementations
+      LanguageDetectorMock
+      |> stub(:missing_dependencies, fn -> [] end)
+      |> stub(:configured?, fn -> true end)
+
+      :ok
+    end
+
+    test "returns all features including configurable ones" do
+      features = @features ++ @configureable_features
+
+      assert Enum.sort(InstanceView.features()) == Enum.sort(features)
+    end
+  end
+end