Barcode Generation

node_modules/jsbarcode/test/node/JsBarcode.test.js

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+var assert = require('assert');
+var JsBarcode = require('../../bin/JsBarcode.js');
+var { createCanvas } = require("canvas");
+
+describe('Encoders', function() {
+  it('should be able to include the encoders needed', function () {
+    CODE128 = JsBarcode.getModule("CODE128");
+    GENERIC = JsBarcode.getModule("GenericBarcode");
+  });
+});
+
+describe('node-canvas generation', function() {
+  it('should generate normal canvas', function () {
+    var canvas = createCanvas();
+    JsBarcode(canvas, "Hello");
+  });
+
+  it('checking width', function () {
+    var canvas1 = createCanvas();
+    var canvas2 = createCanvas();
+
+    JsBarcode(canvas1, "Hello", {format: "CODE128"});
+    JsBarcode(canvas2, "Hello", {format: "CODE39"});
+
+    assert.notEqual(canvas1.width, canvas2.width);
+  });
+
+  it('should throws errors when suppose to', function () {
+    var canvas = createCanvas();
+    assert.throws(function(){JsBarcode(canvas, "Hello", {format: "EAN8"});});
+    assert.throws(function(){JsBarcode("Hello", "Hello", {format: "DOESNOTEXIST"});});
+    assert.throws(function(){JsBarcode(123, "Hello", {format: "DOESNOTEXIST"});});
+  });
+
+  it('should use the valid callback correct', function (done) {
+    var canvas = createCanvas();
+
+    JsBarcode(canvas, "Hello", {
+      format: "CODE128",
+      valid: function(valid){
+        if(valid){
+          done();
+        }
+      }
+    });
+  });
+
+  it('should use false valid callback correct', function (done) {
+    var canvas = createCanvas();
+
+    JsBarcode(canvas, "Hello", {
+      format: "pharmacode",
+      valid: function(valid){
+        if(!valid){
+          done();
+        }
+      }
+    });
+  });
+
+  it('should create output with same input', function () {
+    var canvas1 = createCanvas();
+    var canvas2 = createCanvas();
+
+    JsBarcode(canvas1, "Hello", {format: "CODE128"});
+    JsBarcode(canvas2, "Hello", {format: "CODE128"});
+
+    assert.equal(canvas1.toDataURL(), canvas2.toDataURL());
+  });
+
+  it('should set background', function () {
+    var canvas = createCanvas();
+    var ctx = canvas.getContext("2d");
+    JsBarcode(canvas, "Hello", {format: "CODE128", background: "#f00"});
+
+    var topLeft = ctx.getImageData(0,0,1,1);
+    assert.equal(255, topLeft.data[0]);
+    assert.equal(0, topLeft.data[1]);
+    assert.equal(0, topLeft.data[2]);
+  });
+});
+
+describe('Text printing', function() {
+  it('should produce different output when displaying value', function () {
+    var canvas1 = createCanvas();
+    var canvas2 = createCanvas();
+
+    JsBarcode(canvas1, "Hello", {format: "CODE128", displayValue: false});
+    JsBarcode(canvas2, "Hello", {format: "CODE128"});
+
+    assert.notEqual(canvas1.toDataURL(), canvas2.toDataURL());
+  });
+
+  it('should produce different output when having different textAlign', function () {
+    var canvas1 = createCanvas();
+    var canvas2 = createCanvas();
+    var canvas3 = createCanvas();
+
+    JsBarcode(canvas1, "Hello", {format: "CODE128", displayValue: true, textAlign: "center"});
+    JsBarcode(canvas2, "Hello", {format: "CODE128", displayValue: true, textAlign: "left"});
+    JsBarcode(canvas3, "Hello", {format: "CODE128", displayValue: true, textAlign: "right"});
+
+    assert.notEqual(canvas1.toDataURL(), canvas2.toDataURL());
+    assert.notEqual(canvas2.toDataURL(), canvas3.toDataURL());
+    assert.notEqual(canvas1.toDataURL(), canvas3.toDataURL());
+  });
+
+  it('should allow numbers as input', function () {
+    var canvas = createCanvas();
+
+    JsBarcode(canvas, 1234567890128, {format: "EAN13"});
+  });
+});
+
+describe('Extended Arrays', function() {
+  it('should work with extended arrays', function () {
+    Array.prototype.test = function(){};
+    Array.prototype._test = "test";
+
+    var canvas = createCanvas();
+    JsBarcode(canvas, "Hello");
+    JsBarcode(canvas, "HI", {format: "CODE39"});
+  });
+});
+
+describe('Generic barcode', function() {
+  it('should not fail generic barcode', function () {
+    var enc = new GENERIC("1234", {});
+    assert.equal(enc.valid(), true);
+    assert.equal(enc.encode().text, "1234");
+  });
+});