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backend/node_modules/fastify/test/diagnostics-channel.test.js

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+'use strict'
+
+const t = require('tap')
+const test = t.test
+const proxyquire = require('proxyquire')
+
+test('diagnostics_channel when present and subscribers', t => {
+  t.plan(3)
+
+  let fastifyInHook
+
+  const dc = {
+    channel (name) {
+      t.equal(name, 'fastify.initialization')
+      return {
+        hasSubscribers: true,
+        publish (event) {
+          t.ok(event.fastify)
+          fastifyInHook = event.fastify
+        }
+      }
+    },
+    '@noCallThru': true
+  }
+
+  const fastify = proxyquire('../fastify', {
+    'node:diagnostics_channel': dc
+  })()
+  t.equal(fastifyInHook, fastify)
+})
+
+test('diagnostics_channel when present and no subscribers', t => {
+  t.plan(1)
+
+  const dc = {
+    channel (name) {
+      t.equal(name, 'fastify.initialization')
+      return {
+        hasSubscribers: false,
+        publish () {
+          t.fail('publish should not be called')
+        }
+      }
+    },
+    '@noCallThru': true
+  }
+
+  proxyquire('../fastify', {
+    'node:diagnostics_channel': dc
+  })()
+})
+
+test('diagnostics_channel when not present', t => {
+  t.plan(1)
+
+  t.doesNotThrow(() => {
+    proxyquire('../fastify', {
+      'node:diagnostics_channel': null
+    })()
+  })
+})