diff --git a/src/shared/__tests__/checkExistApiConfig.test.ts b/src/shared/__tests__/checkExistApiConfig.test.ts
new file mode 100644
index 0000000..13b64f5
--- /dev/null
+++ b/src/shared/__tests__/checkExistApiConfig.test.ts
@@ -0,0 +1,56 @@
+import { checkExistKey } from '../checkExistApiConfig';
+import { ApiConfiguration } from '../api';
+
+describe('checkExistKey', () => {
+  it('should return false for undefined config', () => {
+    expect(checkExistKey(undefined)).toBe(false);
+  });
+
+  it('should return false for empty config', () => {
+    const config: ApiConfiguration = {};
+    expect(checkExistKey(config)).toBe(false);
+  });
+
+  it('should return true when one key is defined', () => {
+    const config: ApiConfiguration = {
+      apiKey: 'test-key'
+    };
+    expect(checkExistKey(config)).toBe(true);
+  });
+
+  it('should return true when multiple keys are defined', () => {
+    const config: ApiConfiguration = {
+      apiKey: 'test-key',
+      glamaApiKey: 'glama-key',
+      openRouterApiKey: 'openrouter-key'
+    };
+    expect(checkExistKey(config)).toBe(true);
+  });
+
+  it('should return true when only non-key fields are undefined', () => {
+    const config: ApiConfiguration = {
+      apiKey: 'test-key',
+      apiProvider: undefined,
+      anthropicBaseUrl: undefined
+    };
+    expect(checkExistKey(config)).toBe(true);
+  });
+
+  it('should return false when all key fields are undefined', () => {
+    const config: ApiConfiguration = {
+      apiKey: undefined,
+      glamaApiKey: undefined,
+      openRouterApiKey: undefined,
+      awsRegion: undefined,
+      vertexProjectId: undefined,
+      openAiApiKey: undefined,
+      ollamaModelId: undefined,
+      lmStudioModelId: undefined,
+      geminiApiKey: undefined,
+      openAiNativeApiKey: undefined,
+      deepSeekApiKey: undefined,
+      vsCodeLmModelSelector: undefined
+    };
+    expect(checkExistKey(config)).toBe(false);
+  });
+});
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