expose additional context when rendering

.prettierrc

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+{
+  "semi": false,
+  "singleQuote": true
+}

__mocks__/contextComponent.js

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+const { createElement: h } = require('react')
+let context = {}
+
+const component = function() {
+  context.test = true
+  return h('div', null, 'I am a context component')
+}
+
+component.context = context
+
+module.exports = component

__mocks__/testComponent.js

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+const { createElement: h } = require('react')
+
+module.exports = function() {
+  return h('div', null, 'I am a test component')
+}

__tests__/server.spec.js

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+const { spawn } = require('child_process')
+const path = require('path')
+
+describe('server', function() {
+  let proc
+
+  beforeEach(function() {
+    proc = spawn(path.join(__dirname, '..', 'bin', 'react-stdio'), {
+      stdio: 'pipe'
+    })
+  })
+
+  afterEach(function() {
+    proc.kill()
+  })
+
+  it('throws an error when component is missing', function(done) {
+    proc.stdin.write(JSON.stringify({}))
+
+    proc.stdout.once('data', function(out) {
+      expect(JSON.parse(out).error).toEqual('Missing { component } in request')
+
+      done()
+    })
+  })
+
+  it('throws an error when component cannot be found', function(done) {
+    proc.stdin.write(JSON.stringify({ component: 'component.js' }))
+
+    proc.stdout.once('data', function(out) {
+      expect(JSON.parse(out).error).toEqual(
+        'Cannot load component: component.js'
+      )
+
+      done()
+    })
+  })
+
+  it('renders the component', function(done) {
+    proc.stdin.write(
+      JSON.stringify({
+        component: path.join(__dirname, '..', '__mocks__', 'testComponent.js')
+      })
+    )
+
+    proc.stdout.once('data', function(out) {
+      expect(JSON.parse(out).html).toMatch('I am a test component')
+
+      done()
+    })
+  })
+
+  it('renders a component and exposes additional context', function(done) {
+    proc.stdin.write(
+      JSON.stringify({
+        component: path.join(
+          __dirname,
+          '..',
+          '__mocks__',
+          'contextComponent.js'
+        )
+      })
+    )
+
+    proc.stdout.once('data', function(out) {
+      const result = JSON.parse(out)
+
+      expect(result.html).toMatch('I am a context component')
+      expect(result.context).toEqual({ test: true })
+
+      done()
+    })
+  })
+})