End-to-end tests, written once, replayable forever — in a single Go binary.

version = 1

generator "email" "user_email" {
  prefix = "qa-"
  domain = "example.com"
}

scenario "Create blog post" {
  step "http" "create_user" {
    request {
      method = "POST"
      url    = "https://api.example.com/users"
      body {
        json = {
          email    = generate("user_email")
          password = "Sup3rS3cret!"
        }
      }
    }

    expect {
      status = 201
      json = {
        id    = is_string()
        email = request.body.json.email
      }
    }

    capture {
      id    = response.json.id
      email = response.json.email
    }
  }

  step "http" "create_post" {
    request {
      method  = "POST"
      url     = "https://api.example.com/blog/posts"
      headers = { Author = result.create_user.id }
      body {
        json = {
          title = "Hello from Tales"
          body  = "Reproducible test data, every run."
        }
      }
    }

    expect {
      status = 201
    }
  }

  teardown {
    step "http" "delete_user" {
      when = can(result.create_user.id)
      request {
        method = "DELETE"
        url    = "https://api.example.com/users/${result.create_user.id}"
      }
      expect { status = one_of([200, 204, 404]) }
    }
  }
}

# Validate scenarios without running them (parse + reference checks)
$ tales validate ./e2e/pass

# Run the suite with a deterministic seed, 4 scenarios in parallel,
# emit JUnit XML for CI and a single-file visual HTML report
$ tales test ./e2e/pass \
    --seed 1234 \
    --parallel 4 \
    --report-junit  ./reports/junit.xml \
    --report-html   ./reports/visual.html

tales: loaded 12 scenarios from 5 files; timeout=disabled
PASS  e2e/pass/blog.tales        Create blog post  (842ms)
PASS  e2e/pass/keyword.tales     Use keyword       (231ms)
PASS  e2e/pass/sql.tales         PostgreSQL ops    ( 95ms)
…
Summary: 12 passed · 0 failed · 0 skipped · 1.24s
HTML report: ./reports/visual.html

{"event":"suite_start","seed":1234,"parallel":4,"files":5,"scenarios":12}
{"event":"scenario_start","scenario":"Create blog post","tags":[]}
{"event":"step","scenario":"Create blog post","step":"create_user","status":"pass","duration_ms":312}
{"event":"step","scenario":"Create blog post","step":"create_post","status":"pass","duration_ms":418}
{"event":"teardown_step","scenario":"Create blog post","step":"delete_user","status":"pass","duration_ms":112}
{"event":"scenario_end","scenario":"Create blog post","status":"pass","duration_ms":842}
{"event":"suite_end","status":"pass","passed":12,"failed":0,"skipped":0,"duration_ms":1240}