From 259e56bb9e6dec9739f8ee93536a38ccb363dd42 Mon Sep 17 00:00:00 2001
From: Raphael Zimmermann <raphael.zimmermann@ergon.ch>
Date: Thu, 4 May 2023 07:41:09 +0200
Subject: [PATCH] Add simple test for compare

The tests were initially super slow, as the PNG.sync.write took up to 20 seconds.
This seems to be related to jest [1][2]. I therefore added Math to the
sandboxInjectedGlobals to speed things up.

[1] https://github.com/pngjs/pngjs/issues/96
[2] https://github.com/jestjs/jest/issues/5163#issuecomment-457925591
---
 pixelpact/.dockerignore                |   1 +
 pixelpact/package-lock.json            |  31 ++++++++++++++++++-------
 pixelpact/package.json                 |   8 ++++++-
 pixelpact/src/compare.js               |   8 ++++---
 pixelpact/src/compare.test.js          |  17 ++++++++++++++
 pixelpact/testdata/simple-actual.png   | Bin 0 -> 13453 bytes
 pixelpact/testdata/simple-diff.png     | Bin 0 -> 10892 bytes
 pixelpact/testdata/simple-expected.png | Bin 0 -> 13680 bytes
 8 files changed, 53 insertions(+), 12 deletions(-)
 create mode 100644 pixelpact/.dockerignore
 create mode 100644 pixelpact/src/compare.test.js
 create mode 100644 pixelpact/testdata/simple-actual.png
 create mode 100644 pixelpact/testdata/simple-diff.png
 create mode 100644 pixelpact/testdata/simple-expected.png

diff --git a/pixelpact/.dockerignore b/pixelpact/.dockerignore
new file mode 100644
index 0000000..830f581
--- /dev/null
+++ b/pixelpact/.dockerignore
@@ -0,0 +1 @@
+testdata
\ No newline at end of file
diff --git a/pixelpact/package-lock.json b/pixelpact/package-lock.json
index c2b2657..b902760 100644
--- a/pixelpact/package-lock.json
+++ b/pixelpact/package-lock.json
@@ -14,7 +14,7 @@
         "fastify": "^4.6.0",
         "pixelmatch": "^5.3.0",
         "playwright": "^1.26.1",
-        "pngjs": "^6.0.0"
+        "pngjs": "^7.0.0"
       },
       "devDependencies": {
         "jest": "^29.5.0",
@@ -3652,6 +3652,14 @@
         "pixelmatch": "bin/pixelmatch"
       }
     },
+    "node_modules/pixelmatch/node_modules/pngjs": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-6.0.0.tgz",
+      "integrity": "sha512-TRzzuFRRmEoSW/p1KVAmiOgPco2Irlah+bGFCeNfJXxxYGwSw7YwAOAcd7X28K/m5bjBWKsC29KyoMfHbypayg==",
+      "engines": {
+        "node": ">=12.13.0"
+      }
+    },
     "node_modules/pkg-dir": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
@@ -3691,11 +3699,11 @@
       }
     },
     "node_modules/pngjs": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-6.0.0.tgz",
-      "integrity": "sha512-TRzzuFRRmEoSW/p1KVAmiOgPco2Irlah+bGFCeNfJXxxYGwSw7YwAOAcd7X28K/m5bjBWKsC29KyoMfHbypayg==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
+      "integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow==",
       "engines": {
-        "node": ">=12.13.0"
+        "node": ">=14.19.0"
       }
     },
     "node_modules/prettier": {
@@ -7291,6 +7299,13 @@
       "integrity": "sha512-o8mkY4E/+LNUf6LzX96ht6k6CEDi65k9G2rjMtBe9Oo+VPKSvl+0GKHuH/AlG+GA5LPG/i5hrekkxUc3s2HU+Q==",
       "requires": {
         "pngjs": "^6.0.0"
+      },
+      "dependencies": {
+        "pngjs": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-6.0.0.tgz",
+          "integrity": "sha512-TRzzuFRRmEoSW/p1KVAmiOgPco2Irlah+bGFCeNfJXxxYGwSw7YwAOAcd7X28K/m5bjBWKsC29KyoMfHbypayg=="
+        }
       }
     },
     "pkg-dir": {
@@ -7318,9 +7333,9 @@
       }
     },
     "pngjs": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-6.0.0.tgz",
-      "integrity": "sha512-TRzzuFRRmEoSW/p1KVAmiOgPco2Irlah+bGFCeNfJXxxYGwSw7YwAOAcd7X28K/m5bjBWKsC29KyoMfHbypayg=="
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
+      "integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow=="
     },
     "prettier": {
       "version": "2.8.2",
diff --git a/pixelpact/package.json b/pixelpact/package.json
index 9050355..6478532 100644
--- a/pixelpact/package.json
+++ b/pixelpact/package.json
@@ -16,11 +16,17 @@
     "fastify": "^4.6.0",
     "pixelmatch": "^5.3.0",
     "playwright": "^1.26.1",
-    "pngjs": "^6.0.0"
+    "pngjs": "^7.0.0"
   },
   "devDependencies": {
     "jest": "^29.5.0",
     "prettier": "2.8.2",
     "supervisor": "^0.12.0"
+  },
+  "jest": {
+    "sandboxInjectedGlobals": [
+      "Math"
+    ],
+    "testEnvironment": "node"
   }
 }
diff --git a/pixelpact/src/compare.js b/pixelpact/src/compare.js
index 9c86202..de5abc9 100644
--- a/pixelpact/src/compare.js
+++ b/pixelpact/src/compare.js
@@ -5,19 +5,21 @@ export async function compare(expected, actual, options = { threshold: 0.01 }) {
   const expectedPng = PNG.sync.read(expected);
   const actualPng = PNG.sync.read(actual);
   const { width, height } = expectedPng;
-  const diff = new PNG({ width, height });
+  const diffPng = new PNG({ width, height });
   const numDiffPixels = pixelmatch(
     expectedPng.data,
     actualPng.data,
-    diff.data,
+    diffPng.data,
     width,
     height,
     options
   );
+  const diff = PNG.sync.write(diffPng);
+
   return {
     numDiffPixels: numDiffPixels,
     expected: expected,
     actual: actual,
-    diff: PNG.sync.write(diff),
+    diff: diff,
   };
 }
diff --git a/pixelpact/src/compare.test.js b/pixelpact/src/compare.test.js
new file mode 100644
index 0000000..58b5a0b
--- /dev/null
+++ b/pixelpact/src/compare.test.js
@@ -0,0 +1,17 @@
+import fs from "fs/promises";
+import { compare } from "./compare.js";
+
+describe("compare", () => {
+  it("returns the number of pixels that differ", async () => {
+    let expected = await fs.readFile("testdata/simple-expected.png");
+    let actual = await fs.readFile("testdata/simple-actual.png");
+    let expectedDiff = await fs.readFile("testdata/simple-diff.png");
+
+    let result = await compare(expected, actual);
+
+    expect(result.numDiffPixels).toBe(152);
+    expect(result.expected).toStrictEqual(expected);
+    expect(result.actual).toStrictEqual(actual);
+    expect(result.diff).toStrictEqual(expectedDiff);
+  });
+});
diff --git a/pixelpact/testdata/simple-actual.png b/pixelpact/testdata/simple-actual.png
new file mode 100644
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