test: add coverage to tty module

PR-URL: #16959 Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

Author: cjihrig

test/pseudo-tty/test-tty-stream-constructors.js

@@ -0,0 +1,21 @@
+'use strict';
+require('../common');
+constassert=require('assert');
+const{ ReadStream, WriteStream }=require('tty');
+
+{
+// Verify that tty.ReadStream can be constructed without new.
+conststream=ReadStream(0);
+
+stream.unref();
+assert(streaminstanceofReadStream);
+assert.strictEqual(stream.isTTY,true);
+}
+
+{
+// Verify that tty.WriteStream can be constructed without new.
+conststream=WriteStream(1);
+
+assert(streaminstanceofWriteStream);
+assert.strictEqual(stream.isTTY,true);
+}

test/pseudo-tty/test-tty-stream-constructors.out

@@ -0,0 +1,85 @@
+'use strict';
+constcommon=require('../common');
+constassert=require('assert');
+const{ WriteStream }=require('tty');
+const{TTY}=process.binding('tty_wrap');
+constgetWindowSize=TTY.prototype.getWindowSize;
+
+functionmonkeyPatchGetWindowSize(fn){
+TTY.prototype.getWindowSize=function(){
+TTY.prototype.getWindowSize=getWindowSize;
+returnfn.apply(this,arguments);
+};
+}
+
+{
+// tty.WriteStream constructor does not define columns and rows if an error
+// occurs while retrieving the window size from the handle.
+monkeyPatchGetWindowSize(function(){
+return-1;
+});
+
+conststream=WriteStream(1);
+
+assert(streaminstanceofWriteStream);
+assert.strictEqual(stream.columns,undefined);
+assert.strictEqual(stream.rows,undefined);
+}
+
+{
+// _refreshSize() emits an error if an error occurs while retrieving the
+// window size from the handle.
+conststream=WriteStream(1);
+
+stream.on('error',common.mustCall((err)=>{
+assert.strictEqual(err.syscall,'getWindowSize');
+}));
+
+monkeyPatchGetWindowSize(function(){
+return-1;
+});
+
+stream._refreshSize();
+}
+
+{
+// _refreshSize() emits a 'resize' event when the window size changes.
+monkeyPatchGetWindowSize(function(size){
+size[0]=80;
+size[1]=24;
+return0;
+});
+
+conststream=WriteStream(1);
+
+stream.on('resize',common.mustCall(()=>{
+assert.strictEqual(stream.columns,82);
+assert.strictEqual(stream.rows,26);
+}));
+
+assert.strictEqual(stream.columns,80);
+assert.strictEqual(stream.rows,24);
+
+monkeyPatchGetWindowSize(function(size){
+size[0]=82;
+size[1]=26;
+return0;
+});
+
+stream._refreshSize();
+}
+
+{
+// WriteStream.prototype.getWindowSize() returns the current columns and rows.
+monkeyPatchGetWindowSize(function(size){
+size[0]=99;
+size[1]=32;
+return0;
+});
+
+conststream=WriteStream(1);
+
+assert.strictEqual(stream.columns,99);
+assert.strictEqual(stream.rows,32);
+assert.deepStrictEqual(stream.getWindowSize(),[99,32]);
+}