add reviewer assigning

github_people_test.go

@@ -0,0 +1,179 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strings"
+	"testing"
+)
+
+func TestListRepositoryUsersCombinesReviewerAndAssigneeEligibility(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var request graphQLRequest
+		if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
+			t.Fatal(err)
+		}
+		switch {
+		case strings.Contains(request.Query, "RepositoryReviewers"):
+			if request.Variables["after"] == nil {
+				_, _ = w.Write([]byte(`{"data":{"repository":{"collaborators":{
+					"pageInfo":{"hasNextPage":true,"endCursor":"next"},
+					"nodes":[
+						{"id":"u1","login":"alice","name":"Alice"},
+						{"id":"u2","login":"bob","name":"Bob"}
+					]
+				}}}}`))
+			} else {
+				_, _ = w.Write([]byte(`{"data":{"repository":{"collaborators":{
+					"pageInfo":{"hasNextPage":false},
+					"nodes":[{"id":"u4","login":"dave","name":"Dave"}]
+				}}}}`))
+			}
+		case strings.Contains(request.Query, "RepositoryAssignees"):
+			_, _ = w.Write([]byte(`{"data":{"repository":{"assignableUsers":{
+				"pageInfo":{"hasNextPage":false},
+				"nodes":[
+					{"id":"u2","login":"bob","name":"Bob"},
+					{"id":"u3","login":"carol","name":"Carol"}
+				]
+			}}}}`))
+		case strings.Contains(request.Query, "RepositoryContributions"):
+			_, _ = w.Write([]byte(`{"data":{"repository":{"defaultBranchRef":{"target":{"history":{
+				"nodes":[
+					{"committedDate":"2026-07-28T12:00:00Z","additions":42,
+						"author":{"user":{"login":"alice"}}},
+					{"committedDate":"2026-07-27T12:00:00Z","additions":8,
+						"author":{"user":{"login":"alice"}}},
+					{"committedDate":"2026-06-01T12:00:00Z","additions":5,
+						"author":{"user":{"login":"bob"}}}
+				]
+			}}}}}}`))
+		default:
+			t.Fatalf("unexpected query: %s", request.Query)
+		}
+	}))
+	defer server.Close()
+
+	client := NewGitHubClient(server.URL, "token")
+	users, err := client.ListRepositoryUsers(context.Background(), "o", "r")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(users) != 4 || users[0].Login != "alice" || !users[0].CanReview ||
+		users[0].CanAssign || users[1].Login != "bob" ||
+		!users[1].CanReview || !users[1].CanAssign ||
+		users[2].Login != "carol" || users[2].CanReview || !users[2].CanAssign ||
+		users[3].Login != "dave" || !users[3].CanReview {
+		t.Fatalf("repository users = %#v", users)
+	}
+	if users[0].RecentCommits != 2 || users[0].RecentAdditions != 50 ||
+		users[0].LastContributionAt.IsZero() || users[1].RecentCommits != 1 {
+		t.Fatalf("repository activity = %#v", users)
+	}
+}
+
+func TestAllAssigneesPaginates(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var request graphQLRequest
+		if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
+			t.Fatal(err)
+		}
+		if !strings.Contains(request.Query, "AssigneesPage") {
+			t.Fatalf("unexpected query: %s", request.Query)
+		}
+		_, _ = w.Write([]byte(`{"data":{"repository":{"pullRequest":{"assignees":{
+			"pageInfo":{"hasNextPage":false},
+			"nodes":[{"id":"u2","login":"bob","name":"Bob"}]
+		}}}}}`))
+	}))
+	defer server.Close()
+
+	client := NewGitHubClient(server.URL, "token")
+	users, err := client.allAssignees(
+		context.Background(), "o", "r", 1,
+		githubUserConnection{
+			PageInfo: githubPageInfo{HasNextPage: true, EndCursor: "next"},
+			Nodes:    []githubActor{{Login: "alice"}},
+		},
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(users) != 2 || users[0].Login != "alice" || users[1].Login != "bob" {
+		t.Fatalf("assignees = %#v", users)
+	}
+}
+
+func TestUpdatePullRequestPeoplePreservesUnchangedReviewers(t *testing.T) {
+	var requests []string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var input struct {
+			Reviewers []string `json:"reviewers"`
+			Assignees []string `json:"assignees"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+			t.Fatal(err)
+		}
+		switch {
+		case strings.HasSuffix(r.URL.Path, "/requested_reviewers"):
+			requests = append(requests, r.Method+":"+strings.Join(input.Reviewers, ","))
+		case strings.HasSuffix(r.URL.Path, "/issues/7"):
+			requests = append(requests, r.Method+":"+strings.Join(input.Assignees, ","))
+		default:
+			t.Fatalf("unexpected REST path: %s", r.URL.Path)
+		}
+		_, _ = w.Write([]byte(`{}`))
+	}))
+	defer server.Close()
+
+	client := NewGitHubClient(server.URL+"/api/graphql", "token")
+	people, err := client.UpdatePullRequestPeople(
+		context.Background(), "o", "r", 7,
+		PullRequestPeopleUpdate{
+			CurrentReviewers: []string{"keep", "remove"},
+			CurrentAssignees: []string{"alice"},
+			Reviewers:        []string{"keep", "add"},
+			Assignees:        []string{"alice", "bob"},
+		},
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"POST:add", "DELETE:remove", "PATCH:alice,bob"}
+	if !slices.Equal(requests, want) {
+		t.Fatalf("REST requests = %v, want %v", requests, want)
+	}
+	if !slices.Equal(people.Reviewers, []string{"keep", "add"}) ||
+		!slices.Equal(people.Assignees, []string{"alice", "bob"}) {
+		t.Fatalf("updated people = %#v", people)
+	}
+}
+
+func TestUpdatePullRequestPeopleReportsSuccessfulPartialChanges(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodDelete {
+			http.Error(w, "cannot remove", http.StatusUnprocessableEntity)
+			return
+		}
+		_, _ = w.Write([]byte(`{}`))
+	}))
+	defer server.Close()
+
+	client := NewGitHubClient(server.URL+"/api/graphql", "token")
+	people, err := client.UpdatePullRequestPeople(
+		context.Background(), "o", "r", 7,
+		PullRequestPeopleUpdate{
+			CurrentReviewers: []string{"keep", "remove"},
+			Reviewers:        []string{"keep", "add"},
+		},
+	)
+	if err == nil || !strings.Contains(err.Error(), "remove reviewers") {
+		t.Fatalf("partial update error = %v", err)
+	}
+	if !equalLoginSets(people.Reviewers, []string{"keep", "remove", "add"}) {
+		t.Fatalf("partial reviewer state = %#v", people.Reviewers)
+	}
+}