From 1edddbca29ca66ff698c8f62782f6a3473bc04c5 Mon Sep 17 00:00:00 2001
From: Martin Zmitko <martin@zmitko.cz>
Date: Jul 15 2023 19:47:53 +0000
Subject: Add unit tests for JS and WASM CRC16 consistency


---

diff --git a/tests/unit_tests/config/global.json b/tests/unit_tests/config/global.json
index 9ac8ab9..c112433 100644
--- a/tests/unit_tests/config/global.json
+++ b/tests/unit_tests/config/global.json
@@ -318,7 +318,7 @@
 						{
 							"from": "./crc16.js",
 							"objects": [
-								"CRC16"
+								"crc16"
 							]
 						},
 						{
diff --git a/tests/unit_tests/tests/crc16_tests.js b/tests/unit_tests/tests/crc16_tests.js
new file mode 100644
index 0000000..c733931
--- /dev/null
+++ b/tests/unit_tests/tests/crc16_tests.js
@@ -0,0 +1,85 @@
+describe("Function CRC16", function() {
+    function checkEqualInt(data) {
+        wasm.set(data);
+        const crcWASM = wasm.crc16(data.byteLength);
+
+        const crc = new CRC16();
+        crc.next(data);
+        const crcJS = crc.crc;
+
+        expect(crcWASM).toEqual(crcJS);
+    }
+
+    function checkEqualFloat(data) {
+        expect(wasm.grow(data.byteLength)).toBe(true);
+        wasm.set(data, 0, true);
+        const crcWASM = wasm.crc16Float(data.byteLength);
+
+        const crc = new CRC16();
+        const MAXUINT32 = 4294967295;
+        for (let i = 0; i < data.length; i++) {
+            crc.single(data[i] * MAXUINT32);
+        }
+        const crcJS = crc.crc;
+
+        expect(crcWASM).toEqual(crcJS);
+    }
+
+	var wasm = {ready: false};
+    eval(crc16);
+    
+	beforeAll(function initWASM(done) { // init WASM module before tests
+        let code = insert_wasm_code("// WASM_CODE //");
+        // replace debug message with done() call to signal that the module is ready
+		code = code.replace('console.debug("WASM farbling module initialized");', 'done();');
+		eval(code);
+	});
+    
+    it("should provide consistent results for both JS and WASM implementations for empty byte data.",function() {
+        expect(wasm.ready).toBe(true);
+        const data = new Uint8Array(40000);
+        checkEqualInt(data);
+    });
+    it("should provide consistent results for both JS and WASM implementations for constant byte data.",function() {
+        expect(wasm.ready).toBe(true);
+        const data = new Uint8Array(40000);
+        for (let i = 0; i < data.length; i++) {
+            data[i] = i % 256;
+        }
+        checkEqualInt(data);
+    });
+    it("should provide consistent results for both JS and WASM implemenations for random byte data.", function() {
+        expect(wasm.ready).toBe(true);
+        for (let i = 0; i < 1; i++) {
+            const randomData = new Uint8Array(40000);
+            for (let i = 0; i < randomData.length; i++) {
+                randomData[i] = Math.random() * 256;
+            }
+            checkEqualInt(randomData);
+        }
+    });
+
+    it("should provide consistent results for both JS and WASM implementations for empty float data.",function() {
+        expect(wasm.ready).toBe(true);
+        const data = new Float32Array(40000);
+        checkEqualFloat(data);
+    });
+    it("should provide consistent results for both JS and WASM implementations for constant float data.",function() {
+        expect(wasm.ready).toBe(true);
+        const data = new Float32Array(40000);
+        for (let i = 0; i < data.length; i++) {
+            data[i] = (i % 256) / 256;
+        }
+        checkEqualFloat(data);
+    });
+    it("should provide consistent results for both JS and WASM implemenations for random float data.", function() {
+        expect(wasm.ready).toBe(true);
+        for (let i = 0; i < 5; i++) {
+            const randomData = new Float32Array(10000);
+            for (let i = 0; i < randomData.length; i++) {
+                randomData[i] = Math.random() * 2 - 1;
+            }
+            checkEqualFloat(randomData);
+        }
+    });
+});