diff --git a/tests/preload-ascii.test.js b/tests/preload-ascii.test.js
new file mode 100644
index 0000000..0ad6e66
--- /dev/null
+++ b/tests/preload-ascii.test.js
@@ -0,0 +1,41 @@
+/**
+ * @jest-environment node
+ *
+ * Asserts that the preload.js allow-list contains the new ascii:* invoke
+ * channels and does NOT contain the dead show-ascii-generator* channels.
+ */
+const fs = require('fs');
+const path = require('path');
+
+const preloadSrc = fs.readFileSync(path.join(__dirname, '..', 'src', 'preload.js'), 'utf-8');
+
+const REQUIRED_CHANNELS = [
+  'ascii:generate',
+  'ascii:list-fonts',
+  'ascii:get-font-meta',
+  'ascii:save',
+  'ascii:copy',
+  'ascii:last-font',
+];
+
+const DEAD_CHANNELS = ['show-ascii-generator', 'show-ascii-generator-window'];
+
+describe('preload.js ASCII channels', () => {
+  test.each(REQUIRED_CHANNELS)('declares %s in the allow-list', (channel) => {
+    expect(preloadSrc).toContain(`'${channel}'`);
+  });
+
+  // DEFERRED to T11 — channels still in allow-list until T11 deletes them.
+  test.skip.each(DEAD_CHANNELS)('removed %s from allow-list', (channel) => {
+    expect(preloadSrc).not.toContain(`'${channel}'`);
+  });
+
+  test('generators.ascii namespace is exposed', () => {
+    expect(preloadSrc).toMatch(/ascii:\s*\{/);
+    expect(preloadSrc).toMatch(/listFonts/);
+    expect(preloadSrc).toMatch(/generate/);
+    expect(preloadSrc).toMatch(/copy/);
+    expect(preloadSrc).toMatch(/save/);
+    expect(preloadSrc).toMatch(/lastFont/);
+  });
+});
diff --git a/tests/preload.test.js b/tests/preload.test.js
index 08c9ea0..91a4295 100644
--- a/tests/preload.test.js
+++ b/tests/preload.test.js
@@ -51,6 +51,12 @@ describe('Preload Security', () => {
       'get-pdf-page-count',
       'select-pdf-folder',
       'open-ascii-generator',
+      'ascii:generate',
+      'ascii:list-fonts',
+      'ascii:get-font-meta',
+      'ascii:save',
+      'ascii:copy',
+      'ascii:last-font',
       'open-table-generator',
       'insert-generated-content',
       'save-pasted-image',