Add tests

test/tests.js

@@ -0,0 +1,74 @@
+console.log("RUNNING JSCANIFY TESTS");
+console.log("Warning: This may take a bit");
+
+const { Canvas, createCanvas, Image, ImageData, loadImage } = require("canvas");
+const { writeFileSync, unlinkSync, existsSync } = require("fs");
+const assert = require("assert");
+
+const jscanify = require("../src/jscanify-node");
+const path = require("path");
+
+const outputPaths = {
+  highlight: __dirname + "/output/highlighted.jpg",
+  extracted: __dirname + "/output/extracted.jpg",
+};
+
+const TEST_IMAGE_PATH = path.join(
+  __dirname,
+  "..",
+  "docs",
+  "images",
+  "test",
+  "test.png"
+);
+
+function setup() {
+  console.log("=== setting up tests ===");
+  console.log("Deleting previously generated images");
+  Object.values(outputPaths).forEach((path) => {
+    if (existsSync(path)) {
+      unlinkSync(path);
+    }
+  });
+}
+
+function test() {
+  const scanner = new jscanify();
+
+  console.log("=== beginning  tests ===");
+  console.log("loading OpenCV.js...");
+  scanner.loadOpenCV(function (cv) {
+    console.log("Finished loading OpenCV.js");
+    describe("feature tests", function (done) {
+      it("should highlight paper", function (done) {
+        const highlighted = scanner.highlightPaper(testImage);
+        writeFileSync(
+          outputPaths.highlight,
+          highlighted.toBuffer("image/jpeg")
+        );
+
+        assert.ok(existsSync(outputPaths.highlight));
+        done()
+      });
+
+      it("should extract paper", function (done) {
+        scanner.extractPaper(testImage, 386, 500, function (extracted) {
+          writeFileSync(
+            outputPaths.extracted,
+            extracted.toBuffer("image/jpeg")
+          );
+
+          assert.ok(existsSync(outputPaths.extracted));
+          done();
+        });
+      });
+    });
+  });
+}
+
+let testImage;
+loadImage(TEST_IMAGE_PATH).then(function (image) {
+  testImage = image;
+  setup();
+  test();
+});