Isolate the text field integration tests

To avoid being able to introduce dependencies between tests this commit
makes sure that we close the document between tests so that we can't
accidentally rely on state set by a previous test.

Author: timvandermeij

test/integration/text_field_spec.mjs

@@ -19,11 +19,11 @@ describe("Text field", () => {
   describe("Empty text field", () => {
     let pages;
 
-    beforeAll(async () => {
+    beforeEach(async () => {
       pages = await loadAndWait("file_pdfjs_form.pdf", getSelector("7R"));
     });
 
-    afterAll(async () => {
+    afterEach(async () => {
       await closePages(pages);
     });