chore: Added test for getRedisParams (#1670)

Signed-off-by: mrickard <maurice@mauricerickard.com>

lib/instrumentation/@node-redis/client.js

@@ -67,6 +67,8 @@ function getRedisParams(clientOpts) {
   return {
     host: clientOpts?.socket?.host || 'localhost',
     port_path_or_id: clientOpts?.socket?.path || clientOpts?.socket?.port || '6379',
-    database_name: clientOpts.database || 0
+    database_name: clientOpts?.database || 0
   }
 }
+
+module.exports.getRedisParams = getRedisParams

test/unit/instrumentation/redis.test.js

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2023 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+'use strict'
+
+const tap = require('tap')
+const client = require('../../../lib/instrumentation/@node-redis/client')
+
+tap.test('getRedisParams should behave as expected', function (t) {
+  t.autoend()
+
+  t.test('given no opts, should return sensible defaults', function (t) {
+    t.autoend()
+    const params = client.getRedisParams()
+    const expected = {
+      host: 'localhost',
+      port_path_or_id: '6379',
+      database_name: 0
+    }
+    t.match(params, expected, 'redis client should be definable without params')
+  })
+  t.test('if host/port are defined incorrectly, should return expected defaults', function (t) {
+    t.autoend()
+    const params = client.getRedisParams({ host: 'myLocalHost', port: '1234' })
+    const expected = {
+      host: 'localhost',
+      port_path_or_id: '6379',
+      database_name: 0
+    }
+    t.match(params, expected, 'should return sensible defaults if defined without socket')
+  })
+  t.test('if host/port are defined correctly, we should see them in config', function (t) {
+    t.autoend()
+    const params = client.getRedisParams({ socket: { host: 'myLocalHost', port: '1234' } })
+    const expected = {
+      host: 'myLocalHost',
+      port_path_or_id: '1234',
+      database_name: 0
+    }
+    t.match(params, expected, 'host/port should be returned when defined correctly')
+  })
+  t.test('path should be used if defined', function (t) {
+    t.autoend()
+    const params = client.getRedisParams({ socket: { path: '5678' } })
+    const expected = {
+      host: 'localhost',
+      port_path_or_id: '5678',
+      database_name: 0
+    }
+    t.match(params, expected, 'path should show up in params')
+  })
+  t.test('path should be preferred over port', function (t) {
+    t.autoend()
+    const params = client.getRedisParams({
+      socket: { host: 'myLocalHost', port: '1234', path: '5678' }
+    })
+    const expected = {
+      host: 'myLocalHost',
+      port_path_or_id: '5678',
+      database_name: 0
+    }
+    t.match(params, expected, 'path should show up in params')
+  })
+  t.test('database name should be definable', function (t) {
+    t.autoend()
+    const params = client.getRedisParams({ database: 12 })
+    const expected = {
+      host: 'localhost',
+      port_path_or_id: '6379',
+      database_name: 12
+    }
+    t.match(params, expected, 'database should be definable')
+  })
+})