test: unflake some net specs (#18782)

lib/browser/api/net.js

@@ -96,11 +96,11 @@ class IncomingMessage extends Readable {
   }
 
   get rawTrailers () {
-    throw new Error('HTTP trailers are not supported.')
+    throw new Error('HTTP trailers are not supported')
   }
 
   get trailers () {
-    throw new Error('HTTP trailers are not supported.')
+    throw new Error('HTTP trailers are not supported')
   }
 
   _storeInternalData (chunk) {
@@ -161,7 +161,7 @@ class ClientRequest extends EventEmitter {
       const urlObj = {}
       const protocol = options.protocol || 'http:'
       if (!kSupportedProtocols.has(protocol)) {
-        throw new Error('Protocol "' + protocol + '" not supported. ')
+        throw new Error('Protocol "' + protocol + '" not supported')
       }
       urlObj.protocol = protocol
 
@@ -186,7 +186,7 @@ class ClientRequest extends EventEmitter {
         // well, and b) possibly too restrictive for real-world usage. That's
         // why it only scans for spaces because those are guaranteed to create
         // an invalid request.
-        throw new TypeError('Request path contains unescaped characters.')
+        throw new TypeError('Request path contains unescaped characters')
       }
       const pathObj = url.parse(options.path || '/')
       urlObj.pathname = pathObj.pathname
@@ -209,13 +209,13 @@ class ClientRequest extends EventEmitter {
       if (options.session instanceof Session) {
         urlRequestOptions.session = options.session
       } else {
-        throw new TypeError('`session` should be an instance of the Session class.')
+        throw new TypeError('`session` should be an instance of the Session class')
       }
     } else if (options.partition) {
       if (typeof options.partition === 'string') {
         urlRequestOptions.partition = options.partition
       } else {
-        throw new TypeError('`partition` should be an a string.')
+        throw new TypeError('`partition` should be a string')
       }
     }
 
@@ -276,20 +276,20 @@ class ClientRequest extends EventEmitter {
 
   set chunkedEncoding (value) {
     if (!this.urlRequest.notStarted) {
-      throw new Error('Can\'t set the transfer encoding, headers have been sent.')
+      throw new Error('Can\'t set the transfer encoding, headers have been sent')
     }
     this.chunkedEncodingEnabled = value
   }
 
   setHeader (name, value) {
     if (typeof name !== 'string') {
-      throw new TypeError('`name` should be a string in setHeader(name, value).')
+      throw new TypeError('`name` should be a string in setHeader(name, value)')
     }
     if (value == null) {
-      throw new Error('`value` required in setHeader("' + name + '", value).')
+      throw new Error('`value` required in setHeader("' + name + '", value)')
     }
     if (!this.urlRequest.notStarted) {
-      throw new Error('Can\'t set headers after they are sent.')
+      throw new Error('Can\'t set headers after they are sent')
     }
 
     const key = name.toLowerCase()
@@ -299,7 +299,7 @@ class ClientRequest extends EventEmitter {
 
   getHeader (name) {
     if (name == null) {
-      throw new Error('`name` is required for getHeader(name).')
+      throw new Error('`name` is required for getHeader(name)')
     }
 
     if (!this.extraHeaders) {
@@ -312,11 +312,11 @@ class ClientRequest extends EventEmitter {
 
   removeHeader (name) {
     if (name == null) {
-      throw new Error('`name` is required for removeHeader(name).')
+      throw new Error('`name` is required for removeHeader(name)')
     }
 
     if (!this.urlRequest.notStarted) {
-      throw new Error('Can\'t remove headers after they are sent.')
+      throw new Error('Can\'t remove headers after they are sent')
     }
 
     const key = name.toLowerCase()
@@ -328,7 +328,7 @@ class ClientRequest extends EventEmitter {
     const chunkIsString = typeof chunk === 'string'
     const chunkIsBuffer = chunk instanceof Buffer
     if (!chunkIsString && !chunkIsBuffer) {
-      throw new TypeError('First argument must be a string or Buffer.')
+      throw new TypeError('First argument must be a string or Buffer')
     }
 
     if (chunkIsString) {
@@ -357,7 +357,7 @@ class ClientRequest extends EventEmitter {
 
   write (data, encoding, callback) {
     if (this.urlRequest.finished) {
-      const error = new Error('Write after end.')
+      const error = new Error('Write after end')
       process.nextTick(writeAfterEndNT, this, error, callback)
       return true
     }