diff --git a/tests/unit/ImportOnyxStateTest.ts b/tests/unit/ImportOnyxStateTest.ts
new file mode 100644
index 000000000000..4a62a1e1a7e1
--- /dev/null
+++ b/tests/unit/ImportOnyxStateTest.ts
@@ -0,0 +1,93 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+import {cleanAndTransformState, transformNumericKeysToArray} from '@components/ImportOnyxState/utils';
+import ONYXKEYS from '@src/ONYXKEYS';
+
+describe('transformNumericKeysToArray', () => {
+    it('converts object with numeric keys to array', () => {
+        const input = {'0': 'a', '1': 'b', '2': 'c'};
+        expect(transformNumericKeysToArray(input)).toEqual(['a', 'b', 'c']);
+    });
+
+    it('handles nested numeric objects', () => {
+        const input = {
+            '0': {'0': 'a', '1': 'b'},
+            '1': {'0': 'c', '1': 'd'},
+        };
+        expect(transformNumericKeysToArray(input)).toEqual([
+            ['a', 'b'],
+            ['c', 'd'],
+        ]);
+    });
+
+    it('preserves non-numeric keys', () => {
+        const input = {foo: 'bar', baz: {'0': 'qux'}};
+        expect(transformNumericKeysToArray(input)).toEqual({foo: 'bar', baz: ['qux']});
+    });
+
+    it('handles empty objects', () => {
+        expect(transformNumericKeysToArray({})).toEqual({});
+    });
+
+    it('handles non-sequential numeric keys', () => {
+        const input = {'0': 'a', '2': 'b', '5': 'c'};
+        expect(transformNumericKeysToArray(input)).toEqual({'0': 'a', '2': 'b', '5': 'c'});
+    });
+});
+
+describe('cleanAndTransformState', () => {
+    it('removes omitted keys and transforms numeric objects', () => {
+        const input = JSON.stringify({
+            [ONYXKEYS.NETWORK]: 'should be removed',
+            someKey: {'0': 'a', '1': 'b'},
+            otherKey: 'value',
+        });
+
+        expect(cleanAndTransformState(input)).toEqual({
+            someKey: ['a', 'b'],
+            otherKey: 'value',
+        });
+    });
+
+    it('handles empty state', () => {
+        expect(cleanAndTransformState('{}')).toEqual({});
+    });
+
+    it('removes keys that start with omitted keys', () => {
+        const input = JSON.stringify({
+            [`${ONYXKEYS.NETWORK}_something`]: 'should be removed',
+            validKey: 'keep this',
+        });
+
+        expect(cleanAndTransformState(input)).toEqual({
+            validKey: 'keep this',
+        });
+    });
+
+    it('throws on invalid JSON', () => {
+        expect(() => cleanAndTransformState('invalid json')).toThrow();
+    });
+
+    it('removes all specified ONYXKEYS', () => {
+        const input = JSON.stringify({
+            [ONYXKEYS.ACTIVE_CLIENTS]: 'remove1',
+            [ONYXKEYS.FREQUENTLY_USED_EMOJIS]: 'remove2',
+            [ONYXKEYS.NETWORK]: 'remove3',
+            [ONYXKEYS.CREDENTIALS]: 'remove4',
+            [ONYXKEYS.PREFERRED_THEME]: 'remove5',
+            keepThis: 'value',
+        });
+
+        const result = cleanAndTransformState(input);
+
+        expect(result).toEqual({
+            keepThis: 'value',
+        });
+
+        // Verify each key is removed
+        expect(result).not.toHaveProperty(ONYXKEYS.ACTIVE_CLIENTS);
+        expect(result).not.toHaveProperty(ONYXKEYS.FREQUENTLY_USED_EMOJIS);
+        expect(result).not.toHaveProperty(ONYXKEYS.NETWORK);
+        expect(result).not.toHaveProperty(ONYXKEYS.CREDENTIALS);
+        expect(result).not.toHaveProperty(ONYXKEYS.PREFERRED_THEME);
+    });
+});