test: stream readable resumeScheduled state

PR-URL: #10299
Ref: #8683
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Italo A. Casas

test/parallel/test-stream-readable-resumeScheduled.js

@@ -0,0 +1,65 @@
+'use strict';
+constcommon=require('../common');
+
+// Testing Readable Stream resumeScheduled state
+
+constassert=require('assert');
+const{ Readable, Writable }=require('stream');
+
+{
+// pipe() test case
+constr=newReadable({read(){}});
+constw=newWritable();
+
+// resumeScheduled should start = `false`.
+assert.strictEqual(r._readableState.resumeScheduled,false);
+
+// calling pipe() should change the state value = true.
+r.pipe(w);
+assert.strictEqual(r._readableState.resumeScheduled,true);
+
+process.nextTick(common.mustCall(()=>{
+assert.strictEqual(r._readableState.resumeScheduled,false);
+}));
+}
+
+{
+// 'data' listener test case
+constr=newReadable({read(){}});
+
+// resumeScheduled should start = `false`.
+assert.strictEqual(r._readableState.resumeScheduled,false);
+
+r.push(Buffer.from([1,2,3]));
+
+// adding 'data' listener should change the state value
+r.on('data',common.mustCall(()=>{
+assert.strictEqual(r._readableState.resumeScheduled,false);
+}));
+assert.strictEqual(r._readableState.resumeScheduled,true);
+
+process.nextTick(common.mustCall(()=>{
+assert.strictEqual(r._readableState.resumeScheduled,false);
+}));
+}
+
+{
+// resume() test case
+constr=newReadable({read(){}});
+
+// resumeScheduled should start = `false`.
+assert.strictEqual(r._readableState.resumeScheduled,false);
+
+// Calling resume() should change the state value.
+r.resume();
+assert.strictEqual(r._readableState.resumeScheduled,true);
+
+r.on('resume',common.mustCall(()=>{
+// The state value should be `false` again
+assert.strictEqual(r._readableState.resumeScheduled,false);
+}));
+
+process.nextTick(common.mustCall(()=>{
+assert.strictEqual(r._readableState.resumeScheduled,false);
+}));
+}