feat: add twitch graphql streamer resolution

internal/app/app_test.go

@@ -0,0 +1,72 @@
+// app_test.go covers the app-layer orchestration around Twitch viewer and streamer resolution.
+// It exercises the background resolution loop independently of Bubble Tea startup
+// so the app wiring can be validated without requiring a full interactive session.
+package app
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"parasocial/internal/tui"
+	"parasocial/internal/twitch"
+)
+
+// fakeStreamerService is a test double for the app's Twitch resolution dependency.
+type fakeStreamerService struct {
+	viewer    *twitch.Viewer
+	viewerErr error
+	channels  map[string]*twitch.Channel
+	errs      map[string]error
+}
+
+// CurrentUser returns the configured fake viewer or viewer error.
+func (f *fakeStreamerService) CurrentUser(context.Context) (*twitch.Viewer, error) {
+	if f.viewerErr != nil {
+		return nil, f.viewerErr
+	}
+	return f.viewer, nil
+}
+
+// ResolveStreamer returns the configured fake channel or resolution error.
+func (f *fakeStreamerService) ResolveStreamer(_ context.Context, login string) (*twitch.Channel, error) {
+	if err, ok := f.errs[login]; ok {
+		return nil, err
+	}
+	return f.channels[login], nil
+}
+
+// TestResolveStreamerEntries verifies that app resolution emits viewer, success, and error updates.
+func TestResolveStreamerEntries(t *testing.T) {
+	t.Parallel()
+
+	service := &fakeStreamerService{
+		viewer: &twitch.Viewer{ID: "7", Login: "viewer"},
+		channels: map[string]*twitch.Channel{
+			"alpha": {ID: "1", Login: "alpha_live"},
+		},
+		errs: map[string]error{
+			"beta": errors.New("lookup failed"),
+		},
+	}
+
+	var updates []tui.StreamerUpdate
+	err := resolveStreamerEntries(context.Background(), service, []string{"alpha", "beta"}, func(update tui.StreamerUpdate) {
+		updates = append(updates, update)
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(updates) != 3 {
+		t.Fatalf("len(updates) = %d", len(updates))
+	}
+	if updates[0].Viewer == nil || updates[0].Viewer.Login != "viewer" {
+		t.Fatalf("viewer update = %#v", updates[0])
+	}
+	if updates[1].Entry == nil || updates[1].Entry.Status != twitch.StreamerReady || updates[1].Entry.Login != "alpha_live" {
+		t.Fatalf("alpha update = %#v", updates[1])
+	}
+	if updates[2].Entry == nil || updates[2].Entry.Status != twitch.StreamerError {
+		t.Fatalf("beta update = %#v", updates[2])
+	}
+}