diff --git a/tests/unit/ds4Billboards.test.js b/tests/unit/ds4Billboards.test.js
index ddae892..6cc20d3 100644
--- a/tests/unit/ds4Billboards.test.js
+++ b/tests/unit/ds4Billboards.test.js
@@ -107,11 +107,13 @@ describe('GradeResultCard — the letter is hero, edge is sign-colored', () => {
   const src = read('components/vyndr/GradeResultCard.tsx');
 
   test('a negative edge NEVER renders green — negative = var(--miss)', () => {
-    expect(src).toMatch(/edgeColor\s*=\s*d\.edge != null && d\.edge < 0 \? 'var\(--miss\)' : 'var\(--g-a\)'/);
-    // both the confidence strip and the projection row use edgeColor, not a
-    // hardcoded green.
-    expect(src).toContain('color: edgeColor');
-    expect(src).toMatch(/d\.edge != null \? edgeColor : 'var\(--text-2\)'/);
+    // DS3 superseded DS4's local const with the centralized colorContract
+    // enforcer — same semantics (negative → var(--miss)), now via the shared
+    // helper. Both the confidence strip and the projection row route edge
+    // through edgeColor(d.edge), never a hardcoded green.
+    expect(src).toMatch(/import \{ edgeColor.*\} from '@\/lib\/colorContract'/);
+    expect(src).toContain('color: edgeColor(d.edge)');
+    expect(src).toMatch(/d\.edge != null \? edgeColor\(d\.edge\) : 'var\(--text-2\)'/);
   });
 
   test('the grade LETTER is still the hero (largest element)', () => {