fork from https://github.com/mozilla/pdf.js.git

test/unit/operator_list_dependencies_spec.js

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+/* Copyright 2026 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { getDocument, PDFPageProxy } from "../../src/display/api.js";
+import { buildGetDocumentParams } from "./test_utils.js";
+import { PixelsPerInch } from "../../src/display/display_utils.js";
+
+describe("dependencies tracking", function () {
+  let dependencies;
+
+  beforeAll(() => {
+    globalThis.StepperManager = {
+      enabled: true,
+      create() {
+        return {
+          init() {},
+          updateOperatorList() {},
+          getNextBreakPoint: () => null,
+          nextBreakPoint: null,
+          shouldSkip: () => false,
+          setOperatorBBoxes(_bboxes, deps) {
+            dependencies = deps;
+          },
+        };
+      },
+    };
+  });
+
+  afterEach(() => {
+    dependencies = null;
+  });
+
+  afterAll(() => {
+    delete globalThis.StepperManager;
+  });
+
+  it("pattern fill", async () => {
+    const loadingTask = getDocument(
+      buildGetDocumentParams("22060_A1_01_Plans.pdf")
+    );
+    const pdfDocument = await loadingTask.promise;
+    const page = await pdfDocument.getPage(1);
+
+    expect(page).toBeInstanceOf(PDFPageProxy);
+    page._pdfBug = true;
+
+    const viewport = page.getViewport({
+      scale: PixelsPerInch.PDF_TO_CSS_UNITS,
+    });
+
+    const { canvas } = pdfDocument.canvasFactory.create(
+      viewport.width,
+      viewport.height
+    );
+
+    const renderTask = page.render({
+      canvas,
+      viewport,
+      recordOperations: true,
+    });
+    await renderTask.promise;
+
+    expect(dependencies.get(14)).toEqual({
+      dependencies: new Set([0, 1, 2, 6, 7, 8, 12, 13]),
+      isRenderingOperation: true,
+    });
+
+    await loadingTask.destroy();
+  });
+});