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diff --git a/‎lib/overlay-database-utils.test.js
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diff --git a/‎src/overlay-database-utils.test.ts
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+import * as fs from "fs";
+import * as path from "path";
+
+import test from "ava";
+import * as sinon from "sinon";
+
+import * as actionsUtil from "./actions-util";
+import * as gitUtils from "./git-utils";
+import { getRunnerLogger } from "./logging";
+import {
+  writeBaseDatabaseOidsFile,
+  writeOverlayChangesFile,
+} from "./overlay-database-utils";
+import { createTestConfig, setupTests } from "./testing-utils";
+import { withTmpDir } from "./util";
+
+setupTests(test);
+
+test("writeOverlayChangesFile generates correct changes file", async (t) => {
+  await withTmpDir(async (tmpDir) => {
+    const dbLocation = path.join(tmpDir, "db");
+    await fs.promises.mkdir(dbLocation, { recursive: true });
+    const sourceRoot = path.join(tmpDir, "src");
+    await fs.promises.mkdir(sourceRoot, { recursive: true });
+    const tempDir = path.join(tmpDir, "temp");
+    await fs.promises.mkdir(tempDir, { recursive: true });
+
+    const logger = getRunnerLogger(true);
+    const config = createTestConfig({ dbLocation });
+
+    // Mock the getFileOidsUnderPath function to return base OIDs
+    const baseOids = {
+      "unchanged.js": "aaa111",
+      "modified.js": "bbb222",
+      "deleted.js": "ccc333",
+    };
+    const getFileOidsStubForBase = sinon
+      .stub(gitUtils, "getFileOidsUnderPath")
+      .resolves(baseOids);
+
+    // Write the base database OIDs file
+    await writeBaseDatabaseOidsFile(config, sourceRoot);
+    getFileOidsStubForBase.restore();
+
+    // Mock the getFileOidsUnderPath function to return overlay OIDs
+    const currentOids = {
+      "unchanged.js": "aaa111",
+      "modified.js": "ddd444", // Changed OID
+      "added.js": "eee555", // New file
+    };
+    const getFileOidsStubForOverlay = sinon
+      .stub(gitUtils, "getFileOidsUnderPath")
+      .resolves(currentOids);
+
+    // Write the overlay changes file, which uses the mocked overlay OIDs
+    // and the base database OIDs file
+    const getTempDirStub = sinon
+      .stub(actionsUtil, "getTemporaryDirectory")
+      .returns(tempDir);
+    const changesFilePath = await writeOverlayChangesFile(
+      config,
+      sourceRoot,
+      logger,
+    );
+    getFileOidsStubForOverlay.restore();
+    getTempDirStub.restore();
+
+    const fileContent = await fs.promises.readFile(changesFilePath, "utf-8");
+    const parsedContent = JSON.parse(fileContent) as { changes: string[] };
+
+    t.deepEqual(
+      parsedContent.changes.sort(),
+      ["added.js", "deleted.js", "modified.js"],
+      "Should identify added, deleted, and modified files",
+    );
+  });
+});