init

node_modules/stream-splicer/test/unshift.js

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+var pipeline = require('../');
+var through = require('through2');
+var test = require('tape');
+
+test('unshift', function (t) {
+    var expected = {};
+    expected.a = [ 5, 6 ];
+    expected.b = [ 3, 4, 500, 600 ];
+    expected.c = [ 13, 14, 510, 610 ];
+    expected.output = [ 13/2, 7, 255, 305 ];
+    
+    t.plan(2 + 4 + 4 + 4);
+    
+    var a = through.obj(function (x, enc, next) {
+        var ex = expected.a.shift();
+        t.equal(x, ex, 'a');
+        this.push(x * 100);
+        next();
+    });
+    var b = through.obj(function (x, enc, next) {
+        var ex = expected.b.shift();
+        t.equal(x, ex, 'b');
+        if (expected.b.length === 2) p.unshift(a)
+        this.push(x + 10);
+        next();
+    });
+    var c = through.obj(function (x, enc, next) {
+        var ex = expected.c.shift();
+        t.equal(x, ex, 'c');
+        this.push(x / 2);
+        next();
+    });
+    
+    var p = pipeline.obj([ b, c ]);
+    p.pipe(through.obj(function (x, enc, next) {
+        var ex = expected.output.shift();
+        t.equal(x, ex);
+        next();
+    }));
+    
+    p.write(3);
+    p.write(4);
+    p.write(5);
+    p.write(6);
+    p.end();
+});