improved stream mocks for older versions and increased compatabity from 0.8 up

test/unit/buffer_flush_tests.js

@@ -0,0 +1,59 @@
+module.exports = function (makeLogger) {
+  var stub = require('./auto_release_stub').make();
+  var fs = require('fs');
+  var once = require('events').EventEmitter.prototype.once;
+  var _ = require('lodash');
+
+  describe('buffer flush', function () {
+    if (require('stream').Writable) {
+      it('writes everything in the buffer to console.error', function () {
+        var line = 'This string is written 10 times to create buffered output\n';
+
+        var exitHandler;
+        stub(process, 'once', function (event, handler) {
+          if (event === 'exit') {
+            exitHandler = handler;
+          }
+          once.call(process, event, handler);
+        });
+
+        var logger = makeLogger();
+
+        // write the line 10 times
+        _.times(10, function () {
+          logger.onDebug(line);
+        });
+
+        // collect everything that is written to fs.appendFileSync
+        var flushedOutput = '';
+        stub(fs, 'appendFileSync', function (path, str) {
+          flushedOutput += str;
+        });
+
+        // call the event handler
+        exitHandler.call(process);
+
+        // the first line is sent immediately to _write and there is nothing we can do about that
+        flushedOutput.should.match(new RegExp(line));
+        flushedOutput.match(new RegExp(line, 'g')).length.should.eql(9);
+      });
+    } else {
+      it('does not fall apart with non streams2 streams', function () {
+        var exitHandler;
+        stub(process, 'once', function (event, handler) {
+          if (event === 'exit') {
+            exitHandler = handler;
+          }
+          once.call(process, event, handler);
+        });
+
+        var logger = makeLogger();
+
+        (function () {
+          // call the event handler
+          exitHandler.call(process);
+        }).should.not.throw();
+      });
+    }
+  });
+};