diff --git a/test/parallel/test-stream-readable-reading-readingMore.js b/test/parallel/test-stream-readable-reading-readingMore.js new file mode 100644 index 0000000000..bee3a1c82a --- /dev/null +++ b/test/parallel/test-stream-readable-reading-readingMore.js @@ -0,0 +1,65 @@ +'use strict'; +const common = require('../common'); +const assert = require('assert'); +const Readable = require('stream').Readable; + +const readable = new Readable({ + read(size) {} +}); + +const state = readable._readableState; + +// Starting off with false initially. +assert.strictEqual(state.reading, false); +assert.strictEqual(state.readingMore, false); + +readable.on('data', common.mustCall((data) => { + // while in a flowing state, should try to read more. + if (state.flowing) + assert.strictEqual(state.readingMore, true); + + // reading as long as we've not ended + assert.strictEqual(state.reading, !state.ended); +}, 2)); + +function onStreamEnd() { + // End of stream; state.reading is false + // And so should be readingMore. + assert.strictEqual(state.readingMore, false); + assert.strictEqual(state.reading, false); +} + +readable.on('readable', common.mustCall(() => { + // 'readable' always gets called before 'end' + // since 'end' hasn't been emitted, more data could be incoming + assert.strictEqual(state.readingMore, true); + + // if the stream has ended, we shouldn't be reading + assert.strictEqual(state.ended, !state.reading); + + if (readable.read() === null) // reached end of stream + process.nextTick(common.mustCall(onStreamEnd, 1)); +}, 2)); + +readable.on('end', common.mustCall(onStreamEnd)); + +readable.push('pushed'); + +// stop emitting 'data' events +readable.pause(); + +// read() should only be called while operating in paused mode +readable.read(6); + +// reading +assert.strictEqual(state.reading, true); +assert.strictEqual(state.readingMore, true); + +// resume emitting 'data' events +readable.resume(); + +// add chunk to front +readable.unshift('unshifted'); + +// end +readable.push(null);