diff --git a/gitnexus/test/unit/scope-resolution/swift-target-grouping.test.ts b/gitnexus/test/unit/scope-resolution/swift-target-grouping.test.ts
new file mode 100644
index 000000000..5b183ae47
--- /dev/null
+++ b/gitnexus/test/unit/scope-resolution/swift-target-grouping.test.ts
@@ -0,0 +1,37 @@
+import { describe, expect, it } from 'vitest';
+import { groupSwiftFilesBySpmTarget } from '../../../src/core/ingestion/languages/swift/target-grouping.js';
+
+describe('groupSwiftFilesBySpmTarget', () => {
+  it('matches a later segment-aligned target prefix after an earlier partial occurrence', () => {
+    const targets = new Map([['Core', 'Modules/Core']]);
+    const items = ['vendor/SubModules/Core/shim/Modules/Core/Thing.swift'];
+
+    const groups = groupSwiftFilesBySpmTarget(items, (item) => item, targets);
+
+    expect(groups.get('Core')).toEqual(items);
+    expect(groups.get('__default__')).toBeUndefined();
+  });
+
+  it('does not treat a partial path segment as a target match', () => {
+    const targets = new Map([['Core', 'Modules/Core']]);
+    const item = 'vendor/SubModules/Core/Thing.swift';
+
+    const groups = groupSwiftFilesBySpmTarget([item], (value) => value, targets);
+
+    expect(groups.get('Core')).toBeUndefined();
+    expect(groups.get('__default__')).toEqual([item]);
+  });
+
+  it('keeps first-target-wins behavior when target paths overlap', () => {
+    const targets = new Map([
+      ['Outer', 'Sources'],
+      ['Inner', 'Sources/Feature'],
+    ]);
+    const item = 'Sources/Feature/Thing.swift';
+
+    const groups = groupSwiftFilesBySpmTarget([item], (value) => value, targets);
+
+    expect(groups.get('Outer')).toEqual([item]);
+    expect(groups.get('Inner')).toBeUndefined();
+  });
+});