test(browser): stop the unit suite losing its page mid-run

[quietbits]

• Fixed the browser unit suite losing its browser page mid-run — each of the 117 test files re-evaluated the ~470-module src/xdr graph in its own iframe until Firefox lost the page partway through
• Replaced the vi.mock in client_from.test.ts with a Server injected via options.server — sharing one iframe means a module mock leaks into every file that runs after it
• Set restoreMocks and unstubGlobals on every vitest config as a backstop, since test/unit runs under both the node and the browser runner
• Gave the new spy a throwing default, since vi.spyOn falls through to the real transport once queued responses run out where the previous bare vi.fn returned undefined
• Added toHaveBeenCalledTimes assertions to both Client.from tests, enforcing the SAC case's documented "no second ledger-entries call" claim
• Cut the browser run to ~6s, since the SDK module graph is now evaluated once per browser instead of 117 times

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates browser test execution to reduce memory usage and improves Client.from unit tests by avoiding module-level transport mocks.

Changes:

• Refactor contract.Client.from tests to inject a real rpc.Server and spy on server.httpClient.post.
• Add assertions around RPC call behavior in Client.from tests.
• Disable Vitest browser isolation to reuse a single iframe across test files and avoid repeated module graph evaluation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
test/unit/contract/client_from.test.ts	Replaces module mocking with injected Server + httpClient.post spy and adds RPC-call assertions.
config/vitest.config.browser.ts	Disables test isolation in browser mode to reduce memory growth and improve runtime.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.