feat: return typed Result from test runner and telemetry task actions

[schaable]

Update test runner (solidity, node, mocha) and telemetry task actions to return Result instead of setting process.exitCode. Define a shared TestSummary type and use isResult with type guards in the parent test task to aggregate results without type assertions.

This should be reviewed after #8012.

[changeset-bot]

🦋 Changeset detected

Latest commit: ed00780

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@nomicfoundation/hardhat-mocha	Patch
@nomicfoundation/hardhat-node-test-runner	Patch
hardhat	Patch

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[Copilot]

Pull request overview

Migrates built-in test runners (solidity, nodejs, mocha) and the telemetry task action to return the new typed Result (from #8012) instead of mutating process.exitCode, and introduces a shared TestSummary type so the parent test task can aggregate results via type guards.

Changes:

• Add shared TestSummary type and switch test runner task actions to return Result<TestSummary, TestSummary>.
• Update the parent test task to aggregate subtask results using isResult + type guards and return a Result itself.
• Update related tests, peer bump metadata, and add a changeset documenting the new public types/helpers.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
v-next/hardhat/src/types/test.ts	Introduces the shared TestSummary type for test runner payloads.
v-next/hardhat/src/internal/builtin-plugins/test/task-action.ts	Aggregates subtask results using Result and returns a Result from the parent test task.
v-next/hardhat/src/internal/builtin-plugins/solidity-test/task-action.ts	Returns Result<TestSummary, TestSummary> instead of setting process.exitCode.
v-next/hardhat/src/internal/builtin-plugins/telemetry/task-action.ts	Returns Result instead of setting process.exitCode for invalid flag combinations.
v-next/hardhat/test/internal/builtin-plugins/solidity-test/task-action.ts	Updates tests to assert on Result.success rather than process.exitCode.
v-next/hardhat-node-test-runner/src/task-action.ts	Returns Result<TestSummary, TestSummary> and uses successResult/errorResult.
v-next/hardhat-node-test-runner/test/index.ts	Removes process.exitCode save/restore since runner no longer sets it.
v-next/hardhat-mocha/src/task-action.ts	Returns Result<TestSummary, TestSummary> and uses successResult/errorResult.
v-next/hardhat-mocha/test/index.ts	Updates expectations to match the new Result wrapper shape.
v-next/hardhat-mocha/test/env.ts	Removes process.exitCode save/restore since runner no longer sets it.
.peer-bumps.json	Updates peer bump reasons to include new Result helpers and TestSummary type usage.
.changeset/ninety-dolls-laugh.md	Documents the new Result return pattern and TestSummary interface as a patch release.

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[alcuadrado]

I think there are two small improvements that could be made, but in general looks good

[schaable]

Older versions of hardhat-mocha didn't include skipped and todo in TestSummary. To keep these versions compatible, we make the fields optional and default them on lines 125-129:

      testSummaries[summaryId] = {
        skipped: 0,
        todo: 0,
        ...summary,
      };

[alcuadrado]

good catch