1 files changed, 126 insertions, 0 deletions
diff --git a/packages/cli/src/ui/hooks/useToolScheduler.test.ts b/packages/cli/src/ui/hooks/useToolScheduler.test.ts
new file mode 100644
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--- /dev/null
+++ b/packages/cli/src/ui/hooks/useToolScheduler.test.ts
@@ -0,0 +1,126 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { formatLlmContentForFunctionResponse } from './useToolScheduler.js';
+import { Part, PartListUnion } from '@google/genai';
+
+describe('formatLlmContentForFunctionResponse', () => {
+  it('should handle simple string llmContent', () => {
+    const llmContent = 'Simple text output';
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({ output: 'Simple text output' });
+    expect(additionalParts).toEqual([]);
+  });
+
+  it('should handle llmContent as a single Part with text', () => {
+    const llmContent: Part = { text: 'Text from Part object' };
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({ output: 'Text from Part object' });
+    expect(additionalParts).toEqual([]);
+  });
+
+  it('should handle llmContent as a PartListUnion array with a single text Part', () => {
+    const llmContent: PartListUnion = [{ text: 'Text from array' }];
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({ output: 'Text from array' });
+    expect(additionalParts).toEqual([]);
+  });
+
+  it('should handle llmContent with inlineData', () => {
+    const llmContent: Part = {
+      inlineData: { mimeType: 'image/png', data: 'base64...' },
+    };
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Binary content of type image/png was processed.',
+    });
+    expect(additionalParts).toEqual([llmContent]);
+  });
+
+  it('should handle llmContent with fileData', () => {
+    const llmContent: Part = {
+      fileData: { mimeType: 'application/pdf', fileUri: 'gs://...' },
+    };
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Binary content of type application/pdf was processed.',
+    });
+    expect(additionalParts).toEqual([llmContent]);
+  });
+
+  it('should handle llmContent as an array of multiple Parts (text and inlineData)', () => {
+    const llmContent: PartListUnion = [
+      { text: 'Some textual description' },
+      { inlineData: { mimeType: 'image/jpeg', data: 'base64data...' } },
+      { text: 'Another text part' },
+    ];
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Tool execution succeeded.',
+    });
+    expect(additionalParts).toEqual(llmContent);
+  });
+
+  it('should handle llmContent as an array with a single inlineData Part', () => {
+    const llmContent: PartListUnion = [
+      { inlineData: { mimeType: 'image/gif', data: 'gifdata...' } },
+    ];
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    // When the array is a single Part and that part is inlineData
+    expect(functionResponseJson).toEqual({
+      status: 'Binary content of type image/gif was processed.',
+    });
+    expect(additionalParts).toEqual(llmContent);
+  });
+
+  it('should handle llmContent as a generic Part (not text, inlineData, or fileData)', () => {
+    // This case might represent a malformed or unexpected Part type.
+    // For example, a Part that is just an empty object or has other properties.
+    const llmContent: Part = { functionCall: { name: 'test', args: {} } }; // Example of a non-standard part for this context
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Tool execution succeeded.',
+    });
+    expect(additionalParts).toEqual([llmContent]);
+  });
+
+  it('should handle empty string llmContent', () => {
+    const llmContent = '';
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({ output: '' });
+    expect(additionalParts).toEqual([]);
+  });
+
+  it('should handle llmContent as an empty array', () => {
+    const llmContent: PartListUnion = [];
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Tool execution succeeded.',
+    });
+    expect(additionalParts).toEqual([]);
+  });
+
+  it('should handle llmContent as a Part with undefined inlineData/fileData/text', () => {
+    const llmContent: Part = {}; // An empty part object
+    const { functionResponseJson, additionalParts } =
+      formatLlmContentForFunctionResponse(llmContent);
+    expect(functionResponseJson).toEqual({
+      status: 'Tool execution succeeded.',
+    });
+    expect(additionalParts).toEqual([llmContent]);
+  });
+});