fix: resolves #1483 (#1527)

platform/viewer/src/connectedComponents/findDisplaySetByUID.test.js

@@ -0,0 +1,43 @@
+import findDisplaySetByUID from './findDisplaySetByUID';
+
+describe('findDisplaySetByUID', () => {
+  test('returns null when studyMetadata isnt an array', () => {
+    const result = findDisplaySetByUID(undefined, 'hello');
+    expect(result).toBeNull();
+  });
+
+  test('returns null when no match found', () => {
+    const result = findDisplaySetByUID([], 'no-match');
+    expect(result).toBeNull();
+  });
+
+  test('it handles missing displaySet arrays', () => {
+    const expected = '9388-2291-a8fe';
+    const studyMetadata = [
+      { displaySets: null },
+      {
+        displaySets: [{ displaySetInstanceUID: expected }],
+      },
+      null,
+      7,
+    ];
+    const result = findDisplaySetByUID(studyMetadata, expected);
+    expect(result.displaySetInstanceUID).toBe(expected);
+  });
+
+  test('returns correct displaySet by UID', () => {
+    const expected = '1234-5678';
+    const studyMetadata = [
+      { displaySets: [{ displaySetInstanceUID: '0011-2239' }] },
+      {
+        displaySets: [
+          { displaySetInstanceUID: '0392-2211' },
+          { displaySetInstanceUID: expected },
+        ],
+      },
+      { displaySets: [{ displaySetInstanceUID: '3384-9933' }] },
+    ];
+    const result = findDisplaySetByUID(studyMetadata, expected);
+    expect(result.displaySetInstanceUID).toBe(expected);
+  });
+});