Add a few unit tests for MSP protocol (#3421)

* Add a few unit tests for msp protocol

* fixup! Add a few unit tests for msp protocol

test/js/msp.test.js

@@ -0,0 +1,71 @@
+import {describe, expect, it} from "vitest";
+import MSP from "../../src/js/msp";
+
+describe("MSP", () => {
+    describe("encode_message_v1", () => {
+        it("handles correctly any code and no data", () => {
+            for (let code = 0; code < 256; code++) {
+                let encodedMessage = MSP.encode_message_v1(code, false);
+                expect(new Uint8Array(encodedMessage)).toEqual(new Uint8Array([36, 77, 60, 0, code, code]));
+            }
+        });
+        it("handles non-empty messages correctly", () => {
+            let [operationCode, inputDataLengthPadding] = crypto.getRandomValues(new Uint8Array(2));
+
+            let inputData = crypto.getRandomValues(new Uint8Array(100 + inputDataLengthPadding % 100));
+
+            let encodedMessage = new Uint8Array(MSP.encode_message_v1(operationCode, inputData));
+
+            // check that header is in place
+            expect(encodedMessage.slice(0, 3)).toEqual(new Uint8Array([36, 77, 60]));
+
+            // check that length got encoded as expected
+            expect(encodedMessage[3]).toEqual(inputData.length);
+
+            // check that operation code is there
+            expect(encodedMessage[4]).toEqual(operationCode);
+
+            // check that data got encoded as expected
+            expect(encodedMessage.slice(5, -1)).toEqual(inputData);
+
+            // and that the checksum is valid
+            let checksum = encodedMessage.slice(3, -1).reduce((acc, curr) => acc ^ curr);
+            expect(encodedMessage[encodedMessage.length - 1]).toEqual(checksum);
+        });
+    });
+
+    describe("encode_message_v2", () => {
+        it("handles correctly any code and no data", () => {
+            for (let codeLowByte = 0; codeLowByte < 256; codeLowByte++) {
+                for (let codeHighByte = 0; codeHighByte < 256; codeHighByte++) {
+                    let encodedMessage = MSP.encode_message_v2(codeLowByte + codeHighByte * 256, false).slice(0, -1);
+                    expect(new Uint8Array(encodedMessage)).toEqual(new Uint8Array([36, 88, 60, 0, codeLowByte, codeHighByte, 0, 0]));
+                }
+            }
+        });
+        it("handles non-empty messages correctly", () => {
+            let [lengthLowByte, lengthHighByte] = crypto.getRandomValues(new Uint8Array(2));
+
+            let inputData = crypto.getRandomValues(new Uint8Array(lengthLowByte + lengthHighByte * 256));
+            let [operationCodeLowByte, operationCodeHighByte] = crypto.getRandomValues(new Uint8Array(2));
+
+            let encodedMessage = new Uint8Array(MSP.encode_message_v2(operationCodeLowByte + 256 * operationCodeHighByte, inputData));
+
+            // check that header is in place
+            expect(encodedMessage.slice(0, 3)).toEqual(new Uint8Array([36, 88, 60]));
+
+            expect(encodedMessage[3]).toEqual(0);
+
+            // check that operation code is there
+            expect(encodedMessage[4]).toEqual(operationCodeLowByte);
+            expect(encodedMessage[5]).toEqual(operationCodeHighByte);
+
+            // check that length got encoded as expected
+            expect(encodedMessage[6]).toEqual(lengthLowByte);
+            expect(encodedMessage[7]).toEqual(lengthHighByte);
+
+            // check that data got encoded as expected
+            expect(encodedMessage.slice(8, -1)).toEqual(inputData);
+        });
+    });
+});