Fix wrong import and tests each import correctly

Author: exoego

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/fs/FsClassesTest.scala

@@ -10,14 +10,15 @@ class FsClassesTest extends AnyFunSpec {
 
   describe("ReadStream") {
     it("supports constructor(") {
-      assert(new ReadStream("package.json") !== null)
+      assert(new ReadStream("package.json").readableLength === 0)
       assert(new ReadStream(Buffer.from("package.json")) !== null)
       assert(new ReadStream(new URL(s"file:///${dirname}/package.json")) !== null)
     }
   }
 
   describe("WriteStream") {
     it("supports constructor") {
+      new WriteStream("package.json").cork()
       assert(new WriteStream("package.json") !== null)
       assert(new WriteStream(Buffer.from("package.json")) !== null)
       assert(new WriteStream(new URL(s"file:///${dirname}/package.json")) !== null)

app/nodejs-v14/src/main/scala/io/scalajs/nodejs/fs/WriteStream.scala

@@ -12,7 +12,7 @@ import scala.scalajs.js.|
   * @see https://nodejs.org/api/fs.html#fs_class_fs_writestream
   */
 @js.native
-@JSImport("fs", "ReadStream")
+@JSImport("fs", "WriteStream")
 class WriteStream(path: Path) extends stream.Writable {
   /////////////////////////////////////////////////////////////////////////////////
   //      Properties