diff --git a/packages/core/src/terminal/ascii-map.test.ts b/packages/core/src/terminal/ascii-map.test.ts
new file mode 100644
index 00000000..5859fd30
--- /dev/null
+++ b/packages/core/src/terminal/ascii-map.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest';
+import { BOX, BRAILLE_SPIN, BLOCK } from './ascii-map.js';
+
+describe('ascii-map terminal fallbacks', () => {
+    it('defines expected BOX drawing character fallbacks', () => {
+        expect(BOX['┌']).toBe('+');
+        expect(BOX['┐']).toBe('+');
+        expect(BOX['└']).toBe('+');
+        expect(BOX['┘']).toBe('+');
+        expect(BOX['─']).toBe('-');
+        expect(BOX['│']).toBe('|');
+        expect(BOX['┼']).toBe('+');
+        expect(BOX['═']).toBe('=');
+        expect(BOX['║']).toBe('|');
+    });
+
+    it('defines expected BRAILLE_SPIN frames', () => {
+        expect(BRAILLE_SPIN).toEqual(['|', '/', '-', '\\']);
+    });
+
+    it('defines expected BLOCK progress elements', () => {
+        expect(BLOCK.full).toBe('#');
+        expect(BLOCK.empty).toBe(' ');
+        expect(BLOCK.partial).toBe('-');
+    });
+});