feat: implement use case "Get Page"

backend/src/kwai/modules/page/get_page.py

@@ -0,0 +1,28 @@
+"""Module for the use case "Get Page"."""
+from dataclasses import dataclass
+
+from kwai.modules.page.pages.page import PageEntity, PageIdentifier
+from kwai.modules.page.pages.page_repository import PageRepository
+
+
+@dataclass(kw_only=True, frozen=True, slots=True)
+class GetPageCommand:
+    """Input for the use case "Get Page"."""
+
+    id: int
+
+
+class GetPage:
+    """Use case "Get Page"."""
+
+    def __init__(self, repo: PageRepository):
+        """Initialize the use case.
+
+        Args:
+            repo: A repository to get the page.
+        """
+        self._repo = repo
+
+    async def execute(self, command: GetPageCommand) -> PageEntity:
+        """Execute the use case."""
+        return await self._repo.get_by_id(PageIdentifier(command.id))

backend/src/tests/modules/page/test_get_page.py

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+"""Module for testing the use case "Get Page"."""
+from kwai.modules.page.get_page import GetPage, GetPageCommand
+from kwai.modules.page.pages.page import PageEntity
+from kwai.modules.page.pages.page_repository import PageRepository
+
+
+async def test_get_page(repo: PageRepository, saved_page: PageEntity):
+    """Test the "Get Page" use case."""
+    command = GetPageCommand(id=saved_page.id.value)
+    page = await GetPage(repo).execute(command)
+    assert page is not None, "There should be a page."
+    assert page.id == saved_page.id, "The id of the pages should be the same."