test(anthropic): migrate to Vitest

[christian-bromann]

Migrating @langchain/anthropic to Vitest.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
langchainjs-docs	✅ Ready	Preview	💬 Add feedback	Aug 12, 2025 0:58am

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Project	Deployment	Preview	Comments	Updated (UTC)
langchainjs-api-refs	⬜️ Ignored			Aug 12, 2025 0:58am

[hntrl]

standard tests doesn't enclose test suites inside of a test block, so I'm pretty sure this will cause false positives

[christian-bromann]

standard tests doesn't enclose test suites inside of a test block, so I'm pretty sure this will cause false positives

@hntrl the Vitest export of this package does see

langchainjs/libs/langchain-standard-tests/src/unit_tests/vitest.ts

Lines 27 to 48 in 4fcd605

	/**
	* Run all unit tests for the chat model.
	* Each test is wrapped in a try/catch block to prevent the entire test suite from failing.
	* If a test fails, the error is logged to the console, and the test suite continues.
	* @returns {boolean}
	*/
	runTests(testName = "ChatModelUnitTests") {
	describe(testName, () => {
	test("should initialize chat model successfully", () =>
	this.testChatModelInit());
	test("should initialize chat model with API key", () =>
	this.testChatModelInitApiKey());
	test("should initialize chat model with streaming enabled", () =>
	this.testChatModelInitStreaming());
	test("should bind tools when tool calling is supported", () =>
	this.testChatModelWithBindTools());
	test("should work with structured output when supported", () =>
	this.testChatModelWithStructuredOutput());
	test("should return standard LangSmith parameters", () =>
	this.testStandardParams());
	});
	}

The reason for this is that previous behavior would log an error but would throw away stack traces and diffs.

[hntrl]

same here