# test

URL: /business/nouns/hypothesis/test · Id: `verb:Hypothesis.test` · Call: `await $.Hypothesis.test({ … })` (SDK) or the `do` tool at `https://api.sb/mcp`. Inputs says what to pass, Outputs what returns, When it waits who approves.

> Test binds a Hypothesis to the Experiment that decides it and moves the Hypothesis to testing.

Test binds a [Hypothesis](/business/nouns/hypothesis) to the [Experiment](/business/nouns/experiment) that decides it and moves the Hypothesis to testing.

## Inputs
| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `hypothesis` | [Hypothesis](/business/nouns/hypothesis) | Yes | The Hypothesis to test. |
| `experiment` | [Experiment](/business/nouns/experiment) | Yes | The Experiment that decides it. |

## Outputs
| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `hypothesis` | [Hypothesis](/business/nouns/hypothesis) | Yes | The Hypothesis, now testing. |

## Effects
- Emits [`Hypothesis.tested`](/business/events/Hypothesis.tested).
- Performed by the [Strategist](/agents/founding/strategist).

## Refuses when
| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | [Hypothesis.test](/business/nouns/hypothesis/test) |
| The record is not in a state that allows this Verb, so the call is refused. | [`refused`](/code/api/errors/refused) | Read the record, run the Verb that moves it to an allowed state, then retry. | [Hypothesis.test](/business/nouns/hypothesis/test) |

## When it waits
| Gate | Default |
| --- | --- |
| Decision class | Low: two-way, nothing at stake |
| [Delay window](/systems/trust-and-governance/controls/one-way-windows) | None: it runs once review passes. |
| Limit | The call [Limit](/business/nouns/limit) of the [Permission](/business/nouns/permission) it runs under. |
| Over the Limit | It waits `pending` for an [Approval](/business/nouns/approval) from the [Founder](/agents/founding/founder). Approved, it runs; refused, it ends `refused` with [`limit-exceeded`](/code/api/errors/limit-exceeded); unanswered by its deadline, it ends `canceled`. |

## Example

**Ask**

```text
Test the latest hypothesis with an experiment.
```

**API**

```bash
curl -X POST https://api.sb/tutorloop.com/hypotheses/hypothesis_1/test \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"experiment":"experiment_1"}'
```

```json
{
  "api": "https://api.sb/tutorloop.com",
  "hypothesis": {
    "$id": "https://api.sb/tutorloop.com/hypotheses/hypothesis_1",
    "$type": "Hypothesis",
    "statement": "Matches high school students with math tutors.",
    "kind": "founding",
    "verdict": "Open",
    "version": 1
  },
  "action": {
    "$id": "https://api.sb/tutorloop.com/actions/action_1",
    "operation": "Hypothesis.test",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/tutorloop.com/actions/action_1"
  }
}
```

**SDK**

```ts
import { $ } from 'startup-builder'

const hypothesis = await $.Hypothesis.test({ hypothesis: 'hypothesis_1', experiment: 'experiment_1' })
```

**CLI**

```bash
npx startup-builder do Hypothesis.test --json '{"hypothesis":"hypothesis_1","experiment":"experiment_1"}'
```

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Hypothesis.test({ hypothesis: 'hypothesis_1', experiment: 'experiment_1' })"
  }
}
```

Next: [`Experiment.start`](/business/nouns/experiment/start) (in `guide:spend-200-to-test-faster`).

Guides that call it: [Spend $200 to test faster](/start/guides/spend-200-to-test-faster).