feat(api): add merge request approval state

Add support for merge request approval state

docs/gl_objects/mr_approvals.rst

@@ -21,6 +21,9 @@ References
   + :class:`gitlab.v4.objects.ProjectMergeRequestApprovalRule`
   + :class:`gitlab.v4.objects.ProjectMergeRequestApprovalRuleManager`
   + :attr:`gitlab.v4.objects.ProjectMergeRequest.approval_rules`
+  + :class:`gitlab.v4.objects.ProjectMergeRequestApprovalState`
+  + :class:`gitlab.v4.objects.ProjectMergeRequestApprovalStateManager`
+  + :attr:`gitlab.v4.objects.ProjectMergeRequest.approval_state`
 
 * GitLab API: https://docs.gitlab.com/ee/api/merge_request_approvals.html
 
@@ -46,6 +49,10 @@ Get project-level or MR-level MR approvals settings::
 
     mr_mras = mr.approvals.get()
 
+Get MR-level approval state::
+
+    mr_approval_state = mr.approval_state.get()
+
 Change project-level or MR-level MR approvals settings::
 
     p_mras.approvals_before_merge = 2

gitlab/v4/objects/merge_request_approvals.py

@@ -19,6 +19,8 @@
     "ProjectMergeRequestApprovalManager",
     "ProjectMergeRequestApprovalRule",
     "ProjectMergeRequestApprovalRuleManager",
+    "ProjectMergeRequestApprovalState",
+    "ProjectMergeRequestApprovalStateManager",
 ]
 
 
@@ -204,3 +206,13 @@ def create(self, data, **kwargs):
         new_data["id"] = self._from_parent_attrs["project_id"]
         new_data["merge_request_iid"] = self._from_parent_attrs["mr_iid"]
         return CreateMixin.create(self, new_data, **kwargs)
+
+
+class ProjectMergeRequestApprovalState(RESTObject):
+    pass
+
+
+class ProjectMergeRequestApprovalStateManager(GetWithoutIdMixin, RESTManager):
+    _path = "/projects/%(project_id)s/merge_requests/%(mr_iid)s/approval_state"
+    _obj_cls = ProjectMergeRequestApprovalState
+    _from_parent_attrs = {"project_id": "project_id", "mr_iid": "iid"}

gitlab/v4/objects/merge_requests.py

@@ -26,6 +26,7 @@
 from .merge_request_approvals import (  # noqa: F401
     ProjectMergeRequestApprovalManager,
     ProjectMergeRequestApprovalRuleManager,
+    ProjectMergeRequestApprovalStateManager,
 )
 from .notes import ProjectMergeRequestNoteManager  # noqa: F401
 from .pipelines import ProjectMergeRequestPipelineManager  # noqa: F401
@@ -140,6 +141,7 @@ class ProjectMergeRequest(
     _id_attr = "iid"
 
     approval_rules: ProjectMergeRequestApprovalRuleManager
+    approval_state: ProjectMergeRequestApprovalStateManager
     approvals: ProjectMergeRequestApprovalManager
     awardemojis: ProjectMergeRequestAwardEmojiManager
     diffs: "ProjectMergeRequestDiffManager"

tests/unit/objects/test_project_merge_request_approvals.py

@@ -178,6 +178,15 @@ def resp_snippet():
         }
     ]
 
+    approval_state_rules = copy.deepcopy(mr_ars_content)
+    approval_state_rules[0]["approved"] = False
+    approval_state_rules[0]["approved_by"] = []
+
+    mr_approval_state_content = {
+        "approval_rules_overwritten": False,
+        "rules": approval_state_rules,
+    }
+
     with responses.RequestsMock(assert_all_requests_are_fired=False) as rsps:
         rsps.add(
             method=responses.GET,
@@ -200,6 +209,13 @@ def resp_snippet():
             content_type="application/json",
             status=200,
         )
+        rsps.add(
+            method=responses.GET,
+            url="http://localhost/api/v4/projects/1/merge_requests/1/approval_state",
+            json=mr_approval_state_content,
+            content_type="application/json",
+            status=200,
+        )
 
         new_mr_ars_content = dict(mr_ars_content[0])
         new_mr_ars_content["name"] = new_approval_rule_name
@@ -315,3 +331,18 @@ def test_update_merge_request_approval_rule(project, resp_snippet):
     assert ar_1.approvals_required == updated_approval_rule_approvals_required
     assert len(ar_1.eligible_approvers) == len(updated_approval_rule_user_ids)
     assert ar_1.eligible_approvers[0]["id"] == updated_approval_rule_user_ids[0]
+
+
+def test_get_merge_request_approval_state(project, resp_snippet):
+    merge_request = project.mergerequests.get(1)
+    approval_state = merge_request.approval_state.get()
+    assert isinstance(
+        approval_state,
+        gitlab.v4.objects.merge_request_approvals.ProjectMergeRequestApprovalState,
+    )
+    assert not approval_state.approval_rules_overwritten
+    assert len(approval_state.rules) == 1
+    assert approval_state.rules[0]["name"] == approval_rule_name
+    assert approval_state.rules[0]["id"] == approval_rule_id
+    assert not approval_state.rules[0]["approved"]
+    assert approval_state.rules[0]["approved_by"] == []