fix: allowMocked when using a callback for the path (#1877)

* fix: allowMocked when using a callback for the path

When an Interceptor was created with a comparator for the path, the
`matchOrigin` function was comparing the string equivalent of the function
instead of evaluating it.

I'm not a fan of the fact that the function `matchOrigin` is comparing the
pathname, but that's a refactor for another day.

Fixes: #1867

lib/interceptor.js

@@ -355,6 +355,7 @@ module.exports = class Interceptor {
    * match the provided options.
    */
   matchOrigin(options) {
+    const isPathFn = typeof this.path === 'function'
     const isRegex = this.path instanceof RegExp
     const isRegexBasePath = this.scope.basePath instanceof RegExp
 
@@ -370,9 +371,13 @@ module.exports = class Interceptor {
     if (this.scope.transformPathFunction) {
       path = this.scope.transformPathFunction(path)
     }
-    const comparisonKey = isRegex ? this.__nock_scopeKey : this._key
+    const comparisonKey = isPathFn || isRegex ? this.__nock_scopeKey : this._key
     const matchKey = `${method} ${proto}://${options.host}${path}`
 
+    if (isPathFn) {
+      return !!(matchKey.match(comparisonKey) && this.path(path))
+    }
+
     if (isRegex && !isRegexBasePath) {
       return !!matchKey.match(comparisonKey) && this.path.test(path)
     }

tests/test_allow_unmocked.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const http = require('http')
+const { expect } = require('chai')
 const url = require('url')
 const mikealRequest = require('request')
 const { test } = require('tap')
@@ -233,6 +234,18 @@ test('match hostname using regexp with allowUnmocked (issue-1076)', t => {
   })
 })
 
+// https://github.com/nock/nock/issues/1867
+test('match path using callback with allowUnmocked', async t => {
+  const scope = nock('http://example.test', { allowUnmocked: true })
+    .get(uri => uri.endsWith('bar'))
+    .reply()
+
+  const { statusCode } = await got('http://example.test/foo/bar')
+  expect(statusCode).to.equal(200)
+
+  scope.done()
+})
+
 // https://github.com/nock/nock/issues/835
 test('match multiple paths to domain using regexp with allowUnmocked', async t => {
   const server = http.createServer((request, response) => {