diff --git a/src/site/stages/build/drupal/tests/process-manila-pages.unit.spec.js b/src/site/stages/build/drupal/tests/process-manila-pages.unit.spec.js
new file mode 100644
index 0000000000..d36ce05d30
--- /dev/null
+++ b/src/site/stages/build/drupal/tests/process-manila-pages.unit.spec.js
@@ -0,0 +1,88 @@
+/* eslint-disable @department-of-veterans-affairs/axe-check-required */
+const { expect } = require('chai');
+const { processManilaPages } = require('../process-manila-pages');
+
+describe('processManilaPages', () => {
+  it('should process Manila VA Clinic pages and update links', () => {
+    const mockDrupalData = {
+      data: {
+        nodeQuery: {
+          entities: [
+            {
+              fieldAdministration: {
+                entity: {
+                  entityId: '1187',
+                },
+              },
+              entityUrl: {
+                path: '/manila-va-system/test',
+                breadcrumb: [
+                  { url: '/manila-va-system' },
+                  { url: '/manila-va-system/test' },
+                ],
+              },
+              fieldOffice: {
+                entity: {
+                  entityUrl: {
+                    path: '/manila-va-system/office',
+                  },
+                },
+              },
+              fieldListing: {
+                entity: {
+                  entityUrl: {
+                    path: '/manila-va-system/listing',
+                  },
+                },
+              },
+            },
+            {
+              fieldAdministration: {
+                entity: {
+                  entityId: '999',
+                },
+              },
+              entityUrl: {
+                path: '/other-path',
+              },
+            },
+          ],
+        },
+      },
+    };
+
+    processManilaPages(mockDrupalData);
+
+    const processedEntities = mockDrupalData.data.nodeQuery.entities;
+    const manilaPage = processedEntities[0];
+    const otherPage = processedEntities[1];
+
+    expect(manilaPage.entityUrl.path).to.equal('/manila-va-clinic/test');
+    expect(manilaPage.entityUrl.breadcrumb[0].url).to.equal(
+      '/manila-va-clinic',
+    );
+    expect(manilaPage.entityUrl.breadcrumb[1].url).to.equal(
+      '/manila-va-clinic/test',
+    );
+    expect(manilaPage.fieldOffice.entity.entityUrl.path).to.equal(
+      '/manila-va-clinic/office',
+    );
+    expect(manilaPage.fieldListing.entity.entityUrl.path).to.equal(
+      '/manila-va-clinic/listing',
+    );
+    expect(otherPage.entityUrl.path).to.equal('/other-path');
+  });
+
+  it('should handle empty data gracefully', () => {
+    const emptyDrupalData = {
+      data: {
+        nodeQuery: {
+          entities: [],
+        },
+      },
+    };
+
+    processManilaPages(emptyDrupalData);
+    expect(emptyDrupalData.data.nodeQuery.entities).to.deep.equal([]);
+  });
+});