feat: Throw errors for URL paths without leading slashes, which will …

…never match (#1744)

Fix #1730

lib/interceptor.js

@@ -31,8 +31,14 @@ module.exports = class Interceptor {
   constructor(scope, uri, method, requestBody, interceptorOptions) {
     const uriIsStr = typeof uri === 'string'
     // Check for leading slash. Uri can be either a string or a regexp, but
-    // we only need to check strings.
-    if (uriIsStr && /^[^/*]/.test(uri)) {
+    // When enabled filteringScope ignores the passed URL entirely so we skip validation.
+
+    if (
+      !scope.scopeOptions.filteringScope &&
+      uriIsStr &&
+      !uri.startsWith('/') &&
+      !uri.startsWith('*')
+    ) {
       throw Error(
         `Non-wildcard URL path strings must begin with a slash (otherwise they won't match anything) (got: ${uri})`
       )
@@ -224,7 +230,7 @@ module.exports = class Interceptor {
     }
 
     const method = (options.method || 'GET').toUpperCase()
-    let { path = '' } = options
+    let { path = '/' } = options
     let matches
     let matchKey
     const { proto } = options

tests/test_intercept.js

@@ -1300,7 +1300,7 @@ test('match domain and path using regexp', t => {
 // https://github.com/nock/nock/issues/1003
 test('correctly parse request without specified path', t => {
   const scope1 = nock('https://example.test')
-    .get('')
+    .get('/')
     .reply(200)
 
   https
@@ -1317,7 +1317,7 @@ test('correctly parse request without specified path', t => {
 
 test('data is sent with flushHeaders', t => {
   const scope1 = nock('https://example.test')
-    .get('')
+    .get('/')
     .reply(200, 'this is data')
 
   https
@@ -1334,6 +1334,28 @@ test('data is sent with flushHeaders', t => {
     .flushHeaders()
 })
 
+// https://github.com/nock/nock/issues/1730
+test('URL path without leading slash throws expected error', t => {
+  t.throws(() => nock('http://example.test').get(''), {
+    message:
+      "Non-wildcard URL path strings must begin with a slash (otherwise they won't match anything) (got: )",
+  })
+
+  t.end()
+})
+
+test('wildcard param URL should not throw error', t => {
+  nock('http://example.test').get('*')
+
+  t.end()
+})
+
+test('with filteringScope, URL path without leading slash does not throw error', t => {
+  nock('http://example.test', { filteringScope: () => {} }).get('')
+
+  t.end()
+})
+
 test('no new keys were added to the global namespace', t => {
   const leaks = Object.keys(global).filter(
     key => !acceptableGlobalKeys.has(key)