diff --git a/packages/esm-patient-registration-app/src/patient-registration/input/custom-input/identifier/utils.test.ts b/packages/esm-patient-registration-app/src/patient-registration/input/custom-input/identifier/utils.test.ts
new file mode 100644
index 000000000..5f3bd0c02
--- /dev/null
+++ b/packages/esm-patient-registration-app/src/patient-registration/input/custom-input/identifier/utils.test.ts
@@ -0,0 +1,81 @@
+import { isUniqueIdentifierTypeForOffline, shouldBlockPatientIdentifierInOfflineMode } from './utils';
+
+interface IdentifierTypeOptions {
+  uniquenessBehavior?: 'UNIQUE' | 'LOCATION' | 'NON_UNIQUE';
+  manualEntryEnabled?: boolean;
+  automaticGenerationEnabled?: boolean;
+}
+
+function createIdentifierType(options: IdentifierTypeOptions) {
+  return {
+    uniquenessBehavior: options.uniquenessBehavior,
+    identifierSources: [
+      {
+        uuid: 'identifier-source-uuid',
+        name: 'Identifier Source Name',
+        autoGenerationOption: {
+          manualEntryEnabled: options.manualEntryEnabled,
+          automaticGenerationEnabled: options.automaticGenerationEnabled,
+        },
+      },
+    ],
+    name: 'Identifier Type Name',
+    required: true,
+    uuid: 'identifier-type-uuid',
+    fieldName: 'identifierFieldName',
+    format: 'identifierFormat',
+    isPrimary: true,
+  };
+}
+
+describe('shouldBlockPatientIdentifierInOfflineMode function', () => {
+  it('should return false if identifierType is not unique', () => {
+    const identifierType = createIdentifierType({ uniquenessBehavior: null });
+
+    const result = shouldBlockPatientIdentifierInOfflineMode(identifierType);
+
+    expect(result).toBe(false);
+  });
+
+  it('should return false if identifierType is unique and no manual entry is enabled', () => {
+    const identifierType = createIdentifierType({ uniquenessBehavior: null });
+
+    const result = shouldBlockPatientIdentifierInOfflineMode(identifierType);
+
+    expect(result).toBe(false);
+  });
+
+  it('should return true if identifierType is unique and manual entry is enabled', () => {
+    const identifierType = createIdentifierType({ manualEntryEnabled: true, uniquenessBehavior: 'UNIQUE' });
+
+    const result = shouldBlockPatientIdentifierInOfflineMode(identifierType);
+
+    expect(result).toBe(true);
+  });
+});
+
+describe('isUniqueIdentifierTypeForOffline function', () => {
+  it('should return true if uniquenessBehavior is UNIQUE', () => {
+    const identifierType = createIdentifierType({ uniquenessBehavior: 'UNIQUE' });
+
+    const result = isUniqueIdentifierTypeForOffline(identifierType);
+
+    expect(result).toBe(true);
+  });
+
+  it('should return true if uniquenessBehavior is LOCATION', () => {
+    const identifierType = createIdentifierType({ uniquenessBehavior: 'LOCATION' });
+
+    const result = isUniqueIdentifierTypeForOffline(identifierType);
+
+    expect(result).toBe(true);
+  });
+
+  it('should return false for other uniqueness behaviors', () => {
+    const identifierType = createIdentifierType({ uniquenessBehavior: null });
+
+    const result = isUniqueIdentifierTypeForOffline(identifierType);
+
+    expect(result).toBe(false);
+  });
+});