chore: improve type-hinting for managers

The 'managers' are dynamically created. This unfortunately means that
we don't have any type-hints for them and so editors which understand
type-hints won't know that they are valid attributes.

 * Add the type-hints for the managers we define.
 * Add a unit test that makes sure that the type-hints and the
   '_managers' attribute are kept in sync with each other.
 * Add unit test that makes sure specified managers in '_managers'
   have a name ending in 'Managers' to keep with current convention.
 * Make RESTObject._managers always present with a default value of
   None.
 * Fix a type-issue revealed now that mypy knows what the type is

21 files changed, 249 insertions, 20 deletions

diff --git a/gitlab/base.py b/gitlab/base.py
index bea1901..361832e 100644
--- a/gitlab/base.py
+++ b/gitlab/base.py
@@ -49,6 +49,7 @@ class RESTObject(object):
     _parent_attrs: Dict[str, Any]
     _short_print_attr: Optional[str] = None
     _updated_attrs: Dict[str, Any]
+    _managers: Optional[Iterable[Tuple[str, str]]] = None
     manager: "RESTManager"
 
     def __init__(self, manager: "RESTManager", attrs: Dict[str, Any]) -> None:
@@ -150,13 +151,13 @@ class RESTObject(object):
         return hash(self.get_id())
 
     def _create_managers(self) -> None:
-        managers = getattr(self, "_managers", None)
-        if managers is None:
+        if self._managers is None:
             return
 
         for attr, cls_name in self._managers:
             cls = getattr(self._module, cls_name)
             manager = cls(self.manager.gitlab, parent=self)
+            # Since we have our own __setattr__ method, we can't use setattr()
             self.__dict__[attr] = manager
 
     def _update_attrs(self, new_attrs: Dict[str, Any]) -> None:
diff --git a/gitlab/v4/cli.py b/gitlab/v4/cli.py
index 2fc1986..6986552 100644
--- a/gitlab/v4/cli.py
+++ b/gitlab/v4/cli.py
@@ -99,7 +99,10 @@ class GitlabCLI(object):
     def do_project_export_download(self) -> None:
         try:
             project = self.gl.projects.get(int(self.args["project_id"]), lazy=True)
-            data = project.exports.get().download()
+            export_status = project.exports.get()
+            if TYPE_CHECKING:
+                assert export_status is not None
+            data = export_status.download()
             sys.stdout.buffer.write(data)
 
         except Exception as e:
diff --git a/gitlab/v4/objects/boards.py b/gitlab/v4/objects/boards.py
index b517fde..ef8d040 100644
--- a/gitlab/v4/objects/boards.py
+++ b/gitlab/v4/objects/boards.py
@@ -26,6 +26,7 @@ class GroupBoardListManager(CRUDMixin, RESTManager):
 
 
 class GroupBoard(SaveMixin, ObjectDeleteMixin, RESTObject):
+    lists: GroupBoardListManager
     _managers = (("lists", "GroupBoardListManager"),)
 
 
@@ -49,6 +50,7 @@ class ProjectBoardListManager(CRUDMixin, RESTManager):
 
 
 class ProjectBoard(SaveMixin, ObjectDeleteMixin, RESTObject):
+    lists: ProjectBoardListManager
     _managers = (("lists", "ProjectBoardListManager"),)
 
 
diff --git a/gitlab/v4/objects/commits.py b/gitlab/v4/objects/commits.py
index 76e582b..0ddff9d 100644
--- a/gitlab/v4/objects/commits.py
+++ b/gitlab/v4/objects/commits.py
@@ -17,6 +17,10 @@ __all__ = [
 
 class ProjectCommit(RESTObject):
     _short_print_attr = "title"
+
+    comments: "ProjectCommitCommentManager"
+    discussions: ProjectCommitDiscussionManager
+    statuses: "ProjectCommitStatusManager"
     _managers = (
         ("comments", "ProjectCommitCommentManager"),
         ("discussions", "ProjectCommitDiscussionManager"),
diff --git a/gitlab/v4/objects/container_registry.py b/gitlab/v4/objects/container_registry.py
index 432cb7f..39f1602 100644
--- a/gitlab/v4/objects/container_registry.py
+++ b/gitlab/v4/objects/container_registry.py
@@ -12,6 +12,7 @@ __all__ = [
 
 
 class ProjectRegistryRepository(ObjectDeleteMixin, RESTObject):
+    tags: "ProjectRegistryTagManager"
     _managers = (("tags", "ProjectRegistryTagManager"),)
 
 
diff --git a/gitlab/v4/objects/deployments.py b/gitlab/v4/objects/deployments.py
index 8cf0fd9..73f9672 100644
--- a/gitlab/v4/objects/deployments.py
+++ b/gitlab/v4/objects/deployments.py
@@ -10,6 +10,7 @@ __all__ = [
 
 
 class ProjectDeployment(SaveMixin, RESTObject):
+    mergerequests: ProjectDeploymentMergeRequestManager
     _managers = (("mergerequests", "ProjectDeploymentMergeRequestManager"),)
 
 
diff --git a/gitlab/v4/objects/discussions.py b/gitlab/v4/objects/discussions.py
index f91d8fb..19d1a06 100644
--- a/gitlab/v4/objects/discussions.py
+++ b/gitlab/v4/objects/discussions.py
@@ -21,6 +21,7 @@ __all__ = [
 
 
 class ProjectCommitDiscussion(RESTObject):
+    notes: ProjectCommitDiscussionNoteManager
     _managers = (("notes", "ProjectCommitDiscussionNoteManager"),)
 
 
@@ -32,6 +33,7 @@ class ProjectCommitDiscussionManager(RetrieveMixin, CreateMixin, RESTManager):
 
 
 class ProjectIssueDiscussion(RESTObject):
+    notes: ProjectIssueDiscussionNoteManager
     _managers = (("notes", "ProjectIssueDiscussionNoteManager"),)
 
 
@@ -43,6 +45,7 @@ class ProjectIssueDiscussionManager(RetrieveMixin, CreateMixin, RESTManager):
 
 
 class ProjectMergeRequestDiscussion(SaveMixin, RESTObject):
+    notes: ProjectMergeRequestDiscussionNoteManager
     _managers = (("notes", "ProjectMergeRequestDiscussionNoteManager"),)
 
 
@@ -59,6 +62,7 @@ class ProjectMergeRequestDiscussionManager(
 
 
 class ProjectSnippetDiscussion(RESTObject):
+    notes: ProjectSnippetDiscussionNoteManager
     _managers = (("notes", "ProjectSnippetDiscussionNoteManager"),)
 
 
diff --git a/gitlab/v4/objects/epics.py b/gitlab/v4/objects/epics.py
index 4311aa7..4ee3611 100644
--- a/gitlab/v4/objects/epics.py
+++ b/gitlab/v4/objects/epics.py
@@ -23,6 +23,9 @@ __all__ = [
 
 class GroupEpic(ObjectDeleteMixin, SaveMixin, RESTObject):
     _id_attr = "iid"
+
+    issues: "GroupEpicIssueManager"
+    resourcelabelevents: GroupEpicResourceLabelEventManager
     _managers = (
         ("issues", "GroupEpicIssueManager"),
         ("resourcelabelevents", "GroupEpicResourceLabelEventManager"),
diff --git a/gitlab/v4/objects/groups.py b/gitlab/v4/objects/groups.py
index ee82415..67fe91c 100644
--- a/gitlab/v4/objects/groups.py
+++ b/gitlab/v4/objects/groups.py
@@ -43,6 +43,34 @@ __all__ = [
 
 class Group(SaveMixin, ObjectDeleteMixin, RESTObject):
     _short_print_attr = "name"
+
+    accessrequests: GroupAccessRequestManager
+    audit_events: GroupAuditEventManager
+    badges: GroupBadgeManager
+    billable_members: GroupBillableMemberManager
+    boards: GroupBoardManager
+    clusters: GroupClusterManager
+    customattributes: GroupCustomAttributeManager
+    deploytokens: GroupDeployTokenManager
+    descendant_groups: "GroupDescendantGroupManager"
+    epics: GroupEpicManager
+    exports: GroupExportManager
+    hooks: GroupHookManager
+    imports: GroupImportManager
+    issues: GroupIssueManager
+    issues_statistics: GroupIssuesStatisticsManager
+    labels: GroupLabelManager
+    members: GroupMemberManager
+    members_all: GroupMemberAllManager
+    mergerequests: GroupMergeRequestManager
+    milestones: GroupMilestoneManager
+    notificationsettings: GroupNotificationSettingsManager
+    packages: GroupPackageManager
+    projects: GroupProjectManager
+    runners: GroupRunnerManager
+    subgroups: "GroupSubgroupManager"
+    variables: GroupVariableManager
+    wikis: GroupWikiManager
     _managers = (
         ("accessrequests", "GroupAccessRequestManager"),
         ("audit_events", "GroupAuditEventManager"),
diff --git a/gitlab/v4/objects/issues.py b/gitlab/v4/objects/issues.py
index c77a8d5..cc1ac3f 100644
--- a/gitlab/v4/objects/issues.py
+++ b/gitlab/v4/objects/issues.py
@@ -105,6 +105,14 @@ class ProjectIssue(
 ):
     _short_print_attr = "title"
     _id_attr = "iid"
+
+    awardemojis: ProjectIssueAwardEmojiManager
+    discussions: ProjectIssueDiscussionManager
+    links: "ProjectIssueLinkManager"
+    notes: ProjectIssueNoteManager
+    resourcelabelevents: ProjectIssueResourceLabelEventManager
+    resourcemilestoneevents: ProjectIssueResourceMilestoneEventManager
+    resourcestateevents: ProjectIssueResourceStateEventManager
     _managers = (
         ("awardemojis", "ProjectIssueAwardEmojiManager"),
         ("discussions", "ProjectIssueDiscussionManager"),
diff --git a/gitlab/v4/objects/members.py b/gitlab/v4/objects/members.py
index 3ff8de5..3812bcb 100644
--- a/gitlab/v4/objects/members.py
+++ b/gitlab/v4/objects/members.py
@@ -43,6 +43,8 @@ class GroupMemberManager(MemberAllMixin, CRUDMixin, RESTManager):
 
 class GroupBillableMember(ObjectDeleteMixin, RESTObject):
     _short_print_attr = "username"
+
+    memberships: "GroupBillableMemberMembershipManager"
     _managers = (("memberships", "GroupBillableMemberMembershipManager"),)
 
 
diff --git a/gitlab/v4/objects/merge_requests.py b/gitlab/v4/objects/merge_requests.py
index 2559207..63f2786 100644
--- a/gitlab/v4/objects/merge_requests.py
+++ b/gitlab/v4/objects/merge_requests.py
@@ -139,9 +139,19 @@ class ProjectMergeRequest(
 ):
     _id_attr = "iid"
 
+    approval_rules: ProjectMergeRequestApprovalRuleManager
+    approvals: ProjectMergeRequestApprovalManager
+    awardemojis: ProjectMergeRequestAwardEmojiManager
+    diffs: "ProjectMergeRequestDiffManager"
+    discussions: ProjectMergeRequestDiscussionManager
+    notes: ProjectMergeRequestNoteManager
+    pipelines: ProjectMergeRequestPipelineManager
+    resourcelabelevents: ProjectMergeRequestResourceLabelEventManager
+    resourcemilestoneevents: ProjectMergeRequestResourceMilestoneEventManager
+    resourcestateevents: ProjectMergeRequestResourceStateEventManager
     _managers = (
-        ("approvals", "ProjectMergeRequestApprovalManager"),
         ("approval_rules", "ProjectMergeRequestApprovalRuleManager"),
+        ("approvals", "ProjectMergeRequestApprovalManager"),
         ("awardemojis", "ProjectMergeRequestAwardEmojiManager"),
         ("diffs", "ProjectMergeRequestDiffManager"),
         ("discussions", "ProjectMergeRequestDiscussionManager"),
diff --git a/gitlab/v4/objects/notes.py b/gitlab/v4/objects/notes.py
index d85fea7..b8a3215 100644
--- a/gitlab/v4/objects/notes.py
+++ b/gitlab/v4/objects/notes.py
@@ -71,6 +71,7 @@ class ProjectCommitDiscussionNoteManager(
 
 
 class ProjectIssueNote(SaveMixin, ObjectDeleteMixin, RESTObject):
+    awardemojis: ProjectIssueNoteAwardEmojiManager
     _managers = (("awardemojis", "ProjectIssueNoteAwardEmojiManager"),)
 
 
@@ -104,6 +105,7 @@ class ProjectIssueDiscussionNoteManager(
 
 
 class ProjectMergeRequestNote(SaveMixin, ObjectDeleteMixin, RESTObject):
+    awardemojis: ProjectMergeRequestNoteAwardEmojiManager
     _managers = (("awardemojis", "ProjectMergeRequestNoteAwardEmojiManager"),)
 
 
@@ -137,7 +139,8 @@ class ProjectMergeRequestDiscussionNoteManager(
 
 
 class ProjectSnippetNote(SaveMixin, ObjectDeleteMixin, RESTObject):
-    _managers = (("awardemojis", "ProjectSnippetNoteAwardEmojiManager"),)
+    awardemojis: ProjectMergeRequestNoteAwardEmojiManager
+    _managers = (("awardemojis", "ProjectMergeRequestNoteAwardEmojiManager"),)
 
 
 class ProjectSnippetNoteManager(CRUDMixin, RESTManager):
diff --git a/gitlab/v4/objects/packages.py b/gitlab/v4/objects/packages.py
index 3e9d9f2..fee043a 100644
--- a/gitlab/v4/objects/packages.py
+++ b/gitlab/v4/objects/packages.py
@@ -143,6 +143,7 @@ class GroupPackageManager(ListMixin, RESTManager):
 
 
 class ProjectPackage(ObjectDeleteMixin, RESTObject):
+    package_files: "ProjectPackageFileManager"
     _managers = (("package_files", "ProjectPackageFileManager"),)
 
 
diff --git a/gitlab/v4/objects/pipelines.py b/gitlab/v4/objects/pipelines.py
index 5118e78..bf41ce1 100644
--- a/gitlab/v4/objects/pipelines.py
+++ b/gitlab/v4/objects/pipelines.py
@@ -74,11 +74,15 @@ class ProjectMergeRequestPipelineManager(CreateMixin, ListMixin, RESTManager):
 
 
 class ProjectPipeline(RefreshMixin, ObjectDeleteMixin, RESTObject):
+    bridges: "ProjectPipelineBridgeManager"
+    jobs: "ProjectPipelineJobManager"
+    test_report: "ProjectPipelineTestReportManager"
+    variables: "ProjectPipelineVariableManager"
     _managers = (
-        ("jobs", "ProjectPipelineJobManager"),
         ("bridges", "ProjectPipelineBridgeManager"),
-        ("variables", "ProjectPipelineVariableManager"),
+        ("jobs", "ProjectPipelineJobManager"),
         ("test_report", "ProjectPipelineTestReportManager"),
+        ("variables", "ProjectPipelineVariableManager"),
     )
 
     @cli.register_custom_action("ProjectPipeline")
@@ -199,6 +203,7 @@ class ProjectPipelineScheduleVariableManager(
 
 
 class ProjectPipelineSchedule(SaveMixin, ObjectDeleteMixin, RESTObject):
+    variables: ProjectPipelineScheduleVariableManager
     _managers = (("variables", "ProjectPipelineScheduleVariableManager"),)
 
     @cli.register_custom_action("ProjectPipelineSchedule")
diff --git a/gitlab/v4/objects/projects.py b/gitlab/v4/objects/projects.py
index ee7aca8..71d4564 100644
--- a/gitlab/v4/objects/projects.py
+++ b/gitlab/v4/objects/projects.py
@@ -110,29 +110,88 @@ class GroupProjectManager(ListMixin, RESTManager):
 
 class Project(RefreshMixin, SaveMixin, ObjectDeleteMixin, RepositoryMixin, RESTObject):
     _short_print_attr = "path"
+
+    access_tokens: ProjectAccessTokenManager
+    accessrequests: ProjectAccessRequestManager
+    additionalstatistics: ProjectAdditionalStatisticsManager
+    approvalrules: ProjectApprovalRuleManager
+    approvals: ProjectApprovalManager
+    audit_events: ProjectAuditEventManager
+    badges: ProjectBadgeManager
+    boards: ProjectBoardManager
+    branches: ProjectBranchManager
+    clusters: ProjectClusterManager
+    commits: ProjectCommitManager
+    customattributes: ProjectCustomAttributeManager
+    deployments: ProjectDeploymentManager
+    deploytokens: ProjectDeployTokenManager
+    environments: ProjectEnvironmentManager
+    events: ProjectEventManager
+    exports: ProjectExportManager
+    files: ProjectFileManager
+    forks: "ProjectForkManager"
+    generic_packages: GenericPackageManager
+    hooks: ProjectHookManager
+    imports: ProjectImportManager
+    issues: ProjectIssueManager
+    issues_statistics: ProjectIssuesStatisticsManager
+    issuesstatistics: ProjectIssuesStatisticsManager
+    jobs: ProjectJobManager
+    keys: ProjectKeyManager
+    labels: ProjectLabelManager
+    members: ProjectMemberManager
+    members_all: ProjectMemberAllManager
+    mergerequests: ProjectMergeRequestManager
+    milestones: ProjectMilestoneManager
+    notes: ProjectNoteManager
+    notificationsettings: ProjectNotificationSettingsManager
+    packages: ProjectPackageManager
+    pagesdomains: ProjectPagesDomainManager
+    pipelines: ProjectPipelineManager
+    pipelineschedules: ProjectPipelineScheduleManager
+    protectedbranches: ProjectProtectedBranchManager
+    protectedtags: ProjectProtectedTagManager
+    pushrules: ProjectPushRulesManager
+    releases: ProjectReleaseManager
+    remote_mirrors: "ProjectRemoteMirrorManager"
+    repositories: ProjectRegistryRepositoryManager
+    runners: ProjectRunnerManager
+    services: ProjectServiceManager
+    snippets: ProjectSnippetManager
+    tags: ProjectTagManager
+    triggers: ProjectTriggerManager
+    users: ProjectUserManager
+    variables: ProjectVariableManager
+    wikis: ProjectWikiManager
+
     _managers = (
         ("access_tokens", "ProjectAccessTokenManager"),
         ("accessrequests", "ProjectAccessRequestManager"),
-        ("approvals", "ProjectApprovalManager"),
+        ("additionalstatistics", "ProjectAdditionalStatisticsManager"),
         ("approvalrules", "ProjectApprovalRuleManager"),
+        ("approvals", "ProjectApprovalManager"),
+        ("audit_events", "ProjectAuditEventManager"),
         ("badges", "ProjectBadgeManager"),
         ("boards", "ProjectBoardManager"),
         ("branches", "ProjectBranchManager"),
-        ("jobs", "ProjectJobManager"),
+        ("clusters", "ProjectClusterManager"),
         ("commits", "ProjectCommitManager"),
         ("customattributes", "ProjectCustomAttributeManager"),
         ("deployments", "ProjectDeploymentManager"),
+        ("deploytokens", "ProjectDeployTokenManager"),
         ("environments", "ProjectEnvironmentManager"),
         ("events", "ProjectEventManager"),
-        ("audit_events", "ProjectAuditEventManager"),
         ("exports", "ProjectExportManager"),
         ("files", "ProjectFileManager"),
         ("forks", "ProjectForkManager"),
         ("generic_packages", "GenericPackageManager"),
         ("hooks", "ProjectHookManager"),
-        ("keys", "ProjectKeyManager"),
         ("imports", "ProjectImportManager"),
         ("issues", "ProjectIssueManager"),
+        ("issues_statistics", "ProjectIssuesStatisticsManager"),
+        ("issuesstatistics", "ProjectIssuesStatisticsManager"),  # Deprecated
+        ("jobs", "ProjectJobManager"),
+        ("keys", "ProjectKeyManager"),
         ("labels", "ProjectLabelManager"),
         ("members", "ProjectMemberManager"),
         ("members_all", "ProjectMemberAllManager"),
@@ -143,9 +202,9 @@ class Project(RefreshMixin, SaveMixin, ObjectDeleteMixin, RepositoryMixin, RESTO
         ("packages", "ProjectPackageManager"),
         ("pagesdomains", "ProjectPagesDomainManager"),
         ("pipelines", "ProjectPipelineManager"),
+        ("pipelineschedules", "ProjectPipelineScheduleManager"),
         ("protectedbranches", "ProjectProtectedBranchManager"),
         ("protectedtags", "ProjectProtectedTagManager"),
-        ("pipelineschedules", "ProjectPipelineScheduleManager"),
         ("pushrules", "ProjectPushRulesManager"),
         ("releases", "ProjectReleaseManager"),
         ("remote_mirrors", "ProjectRemoteMirrorManager"),
@@ -154,15 +213,10 @@ class Project(RefreshMixin, SaveMixin, ObjectDeleteMixin, RepositoryMixin, RESTO
         ("services", "ProjectServiceManager"),
         ("snippets", "ProjectSnippetManager"),
         ("tags", "ProjectTagManager"),
-        ("users", "ProjectUserManager"),
         ("triggers", "ProjectTriggerManager"),
+        ("users", "ProjectUserManager"),
         ("variables", "ProjectVariableManager"),
         ("wikis", "ProjectWikiManager"),
-        ("clusters", "ProjectClusterManager"),
-        ("additionalstatistics", "ProjectAdditionalStatisticsManager"),
-        ("issues_statistics", "ProjectIssuesStatisticsManager"),
-        ("issuesstatistics", "ProjectIssuesStatisticsManager"),  # Deprecated
-        ("deploytokens", "ProjectDeployTokenManager"),
     )
 
     @cli.register_custom_action("Project", ("forked_from_id",))
diff --git a/gitlab/v4/objects/releases.py b/gitlab/v4/objects/releases.py
index e27052d..fb7f4f0 100644
--- a/gitlab/v4/objects/releases.py
+++ b/gitlab/v4/objects/releases.py
@@ -11,6 +11,8 @@ __all__ = [
 
 class ProjectRelease(SaveMixin, RESTObject):
     _id_attr = "tag_name"
+
+    links: "ProjectReleaseLinkManager"
     _managers = (("links", "ProjectReleaseLinkManager"),)
 
 
diff --git a/gitlab/v4/objects/runners.py b/gitlab/v4/objects/runners.py
index 8a18f9b..c9e93b8 100644
--- a/gitlab/v4/objects/runners.py
+++ b/gitlab/v4/objects/runners.py
@@ -34,6 +34,7 @@ class RunnerJobManager(ListMixin, RESTManager):
 
 
 class Runner(SaveMixin, ObjectDeleteMixin, RESTObject):
+    jobs: RunnerJobManager
     _managers = (("jobs", "RunnerJobManager"),)
 
 
diff --git a/gitlab/v4/objects/snippets.py b/gitlab/v4/objects/snippets.py
index b893eca..161129d 100644
--- a/gitlab/v4/objects/snippets.py
+++ b/gitlab/v4/objects/snippets.py
@@ -77,6 +77,10 @@ class SnippetManager(CRUDMixin, RESTManager):
 class ProjectSnippet(UserAgentDetailMixin, SaveMixin, ObjectDeleteMixin, RESTObject):
     _url = "/projects/%(project_id)s/snippets"
     _short_print_attr = "title"
+
+    awardemojis: ProjectSnippetAwardEmojiManager
+    discussions: ProjectSnippetDiscussionManager
+    notes: ProjectSnippetNoteManager
     _managers = (
         ("awardemojis", "ProjectSnippetAwardEmojiManager"),
         ("discussions", "ProjectSnippetDiscussionManager"),
diff --git a/gitlab/v4/objects/users.py b/gitlab/v4/objects/users.py
index cc5cfd8..ad907df 100644
--- a/gitlab/v4/objects/users.py
+++ b/gitlab/v4/objects/users.py
@@ -97,11 +97,16 @@ class CurrentUserStatusManager(GetWithoutIdMixin, UpdateMixin, RESTManager):
 class CurrentUser(RESTObject):
     _id_attr = None
     _short_print_attr = "username"
+
+    emails: CurrentUserEmailManager
+    gpgkeys: CurrentUserGPGKeyManager
+    keys: CurrentUserKeyManager
+    status: CurrentUserStatusManager
     _managers = (
-        ("status", "CurrentUserStatusManager"),
         ("emails", "CurrentUserEmailManager"),
         ("gpgkeys", "CurrentUserGPGKeyManager"),
         ("keys", "CurrentUserKeyManager"),
+        ("status", "CurrentUserStatusManager"),
     )
 
 
@@ -112,12 +117,25 @@ class CurrentUserManager(GetWithoutIdMixin, RESTManager):
 
 class User(SaveMixin, ObjectDeleteMixin, RESTObject):
     _short_print_attr = "username"
+
+    customattributes: UserCustomAttributeManager
+    emails: "UserEmailManager"
+    events: UserEventManager
+    followers_users: "UserFollowersManager"
+    following_users: "UserFollowingManager"
+    gpgkeys: "UserGPGKeyManager"
+    identityproviders: "UserIdentityProviderManager"
+    impersonationtokens: "UserImpersonationTokenManager"
+    keys: "UserKeyManager"
+    memberships: "UserMembershipManager"
+    projects: "UserProjectManager"
+    status: "UserStatusManager"
     _managers = (
         ("customattributes", "UserCustomAttributeManager"),
         ("emails", "UserEmailManager"),
+        ("events", "UserEventManager"),
         ("followers_users", "UserFollowersManager"),
         ("following_users", "UserFollowingManager"),
-        ("events", "UserEventManager"),
         ("gpgkeys", "UserGPGKeyManager"),
         ("identityproviders", "UserIdentityProviderManager"),
         ("impersonationtokens", "UserImpersonationTokenManager"),
diff --git a/tests/unit/objects/test_type_hints.py b/tests/unit/objects/test_type_hints.py
new file mode 100644
index 0000000..6742698
--- /dev/null
+++ b/tests/unit/objects/test_type_hints.py
@@ -0,0 +1,74 @@
+import inspect
+from typing import Dict
+
+import gitlab
+import gitlab.v4.objects
+
+
+def test_managers_annotated():
+    """Ensure _managers have been type annotated"""
+
+    failed_messages = []
+    for module_name, module_value in inspect.getmembers(gitlab.v4.objects):
+        if not inspect.ismodule(module_value):
+            # We only care about the modules
+            continue
+        # Iterate through all the classes in our module
+        for class_name, class_value in sorted(inspect.getmembers(module_value)):
+            if not inspect.isclass(class_value):
+                continue
+
+            # Ignore imported classes from gitlab.base
+            if class_value.__module__ == "gitlab.base":
+                continue
+
+            # A '_managers' attribute is only on a RESTObject
+            if not issubclass(class_value, gitlab.base.RESTObject):
+                continue
+
+            if class_value._managers is None:
+                continue
+
+            # Collect all of our annotations into a Dict[str, str]
+            annotations: Dict[str, str] = {}
+            for attr, annotation in sorted(class_value.__annotations__.items()):
+                if isinstance(annotation, type):
+                    type_name = annotation.__name__
+                else:
+                    type_name = annotation
+                annotations[attr] = type_name
+
+            for attr, manager_class_name in sorted(class_value._managers):
+                # All of our managers need to end with "Manager" for example
+                # "ProjectManager"
+                if not manager_class_name.endswith("Manager"):
+                    failed_messages.append(
+                        (
+                            f"ERROR: Class: {class_name!r} for '_managers' attribute "
+                            f"{attr!r} The specified manager class "
+                            f"{manager_class_name!r} does not have a name ending in "
+                            f"'Manager'. Manager class names are required to end in "
+                            f"'Manager'"
+                        )
+                    )
+                    continue
+                if attr not in annotations:
+                    failed_messages.append(
+                        (
+                            f"ERROR: Class: {class_name!r}: Type annotation missing "
+                            f"for '_managers' attribute {attr!r}"
+                        )
+                    )
+                    continue
+                if manager_class_name != annotations[attr]:
+                    failed_messages.append(
+                        (
+                            f"ERROR: Class: {class_name!r}: Type annotation mismatch "
+                            f"for '_managers' attribute {attr!r}. Type annotation is "
+                            f"{annotations[attr]!r} while '_managers' is "
+                            f"{manager_class_name!r}"
+                        )
+                    )
+
+    failed_msg = "\n".join(failed_messages)
+    assert not failed_messages, failed_msg