diff --git a/src/docker-manager.test.ts b/src/docker-manager.test.ts
new file mode 100644
index 000000000..5887d447a
--- /dev/null
+++ b/src/docker-manager.test.ts
@@ -0,0 +1,54 @@
+// Tests for the docker-manager barrel module.
+//
+// docker-manager.ts re-exports the public API from several focused modules
+// (host-env, config-writer, container-lifecycle, container-cleanup). Those
+// modules have their own dedicated test suites; this file verifies that the
+// barrel module itself correctly re-exports every expected symbol and that
+// each symbol has the expected shape (function). This exercises the barrel's
+// export statements for coverage purposes without duplicating the underlying
+// module tests.
+
+import * as dockerManager from './docker-manager';
+
+describe('docker-manager (barrel re-exports)', () => {
+  it('re-exports host-env symbols', () => {
+    expect(typeof dockerManager.setAwfDockerHost).toBe('function');
+    expect(typeof dockerManager.getLocalDockerEnv).toBe('function');
+    expect(typeof dockerManager.parseDifcProxyHost).toBe('function');
+  });
+
+  it('re-exports config-writer symbols', () => {
+    expect(typeof dockerManager.writeConfigs).toBe('function');
+  });
+
+  it('re-exports container-lifecycle symbols', () => {
+    expect(typeof dockerManager.startContainers).toBe('function');
+    expect(typeof dockerManager.runAgentCommand).toBe('function');
+    expect(typeof dockerManager.fastKillAgentContainer).toBe('function');
+  });
+
+  it('re-exports container-cleanup symbols', () => {
+    expect(typeof dockerManager.collectDiagnosticLogs).toBe('function');
+    expect(typeof dockerManager.stopContainers).toBe('function');
+    expect(typeof dockerManager.preserveIptablesAudit).toBe('function');
+    expect(typeof dockerManager.cleanup).toBe('function');
+  });
+
+  it('exposes no unexpected additional exports', () => {
+    const expectedExports = new Set([
+      'setAwfDockerHost',
+      'getLocalDockerEnv',
+      'parseDifcProxyHost',
+      'writeConfigs',
+      'startContainers',
+      'runAgentCommand',
+      'fastKillAgentContainer',
+      'collectDiagnosticLogs',
+      'stopContainers',
+      'preserveIptablesAudit',
+      'cleanup',
+    ]);
+    const actualExports = new Set(Object.keys(dockerManager));
+    expect(actualExports).toEqual(expectedExports);
+  });
+});