frontend/package-lock.json

@@ -9,7 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "@ericblade/quagga2": "^1.8.4",
-        "@tanstack/react-query": "^5.52.1",
+        "@tanstack/react-query": "^5.59.15",
         "@tanstack/react-table": "^8.20.5",
         "@testing-library/jest-dom": "^5.17.0",
         "@testing-library/react": "^13.4.0",
@@ -22,6 +22,7 @@
         "date-fns": "^3.6.0",
         "fast-xml-parser": "^4.5.0",
         "history": "^5.3.0",
+        "jest-canvas-mock": "^2.5.2",
         "react": "^18.3.1",
         "react-bootstrap": "^2.10.4",
         "react-dom": "^18.3.1",
@@ -3727,9 +3728,9 @@
       }
     },
     "node_modules/@tanstack/query-core": {
-      "version": "5.56.2",
-      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.56.2.tgz",
-      "integrity": "sha512-gor0RI3/R5rVV3gXfddh1MM+hgl0Z4G7tj6Xxpq6p2I03NGPaJ8dITY9Gz05zYYb/EJq9vPas/T4wn9EaDPd4Q==",
+      "version": "5.59.13",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.59.13.tgz",
+      "integrity": "sha512-Oou0bBu/P8+oYjXsJQ11j+gcpLAMpqW42UlokQYEz4dE7+hOtVO9rVuolJKgEccqzvyFzqX4/zZWY+R/v1wVsQ==",
       "license": "MIT",
       "funding": {
         "type": "github",
@@ -3737,12 +3738,12 @@
       }
     },
     "node_modules/@tanstack/react-query": {
-      "version": "5.56.2",
-      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.56.2.tgz",
-      "integrity": "sha512-SR0GzHVo6yzhN72pnRhkEFRAHMsUo5ZPzAxfTMvUxFIDVS6W9LYUp6nXW3fcHVdg0ZJl8opSH85jqahvm6DSVg==",
+      "version": "5.59.15",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.59.15.tgz",
+      "integrity": "sha512-QbVlAkTI78wB4Mqgf2RDmgC0AOiJqer2c5k9STOOSXGv1S6ZkY37r/6UpE8DbQ2Du0ohsdoXgFNEyv+4eDoPEw==",
       "license": "MIT",
       "dependencies": {
-        "@tanstack/query-core": "5.56.2"
+        "@tanstack/query-core": "5.59.13"
       },
       "funding": {
         "type": "github",
@@ -6655,6 +6656,12 @@
         "node": ">=4"
       }
     },
+    "node_modules/cssfontparser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/cssfontparser/-/cssfontparser-1.2.1.tgz",
+      "integrity": "sha512-6tun4LoZnj7VN6YeegOVb67KBX/7JJsqvj+pv3ZA7F878/eN33AbGa5b/S/wXxS/tcp8nc40xRUrsPlxIyNUPg==",
+      "license": "MIT"
+    },
     "node_modules/cssnano": {
       "version": "5.1.15",
       "resolved": "https://registry.npmjs.org/cssnano/-/cssnano-5.1.15.tgz",
@@ -10610,6 +10617,16 @@
         }
       }
     },
+    "node_modules/jest-canvas-mock": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/jest-canvas-mock/-/jest-canvas-mock-2.5.2.tgz",
+      "integrity": "sha512-vgnpPupjOL6+L5oJXzxTxFrlGEIbHdZqFU+LFNdtLxZ3lRDCl17FlTMM7IatoRQkrcyOTMlDinjUguqmQ6bR2A==",
+      "license": "MIT",
+      "dependencies": {
+        "cssfontparser": "^1.2.1",
+        "moo-color": "^1.0.2"
+      }
+    },
     "node_modules/jest-changed-files": {
       "version": "27.5.1",
       "resolved": "https://registry.npmjs.org/jest-changed-files/-/jest-changed-files-27.5.1.tgz",
@@ -12147,6 +12164,15 @@
         "mkdirp": "bin/cmd.js"
       }
     },
+    "node_modules/moo-color": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/moo-color/-/moo-color-1.0.3.tgz",
+      "integrity": "sha512-i/+ZKXMDf6aqYtBhuOcej71YSlbjT3wCO/4H1j8rPvxDJEifdwgg5MaFyu6iYAT8GBZJg2z0dkgK4YMzvURALQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "^1.1.4"
+      }
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",

frontend/package.json

@@ -5,7 +5,7 @@
   "proxy": "http://localhost:3001",
   "dependencies": {
     "@ericblade/quagga2": "^1.8.4",
-    "@tanstack/react-query": "^5.52.1",
+    "@tanstack/react-query": "^5.59.15",
     "@tanstack/react-table": "^8.20.5",
     "@testing-library/jest-dom": "^5.17.0",
     "@testing-library/react": "^13.4.0",
@@ -18,6 +18,7 @@
     "date-fns": "^3.6.0",
     "fast-xml-parser": "^4.5.0",
     "history": "^5.3.0",
+    "jest-canvas-mock": "^2.5.2",
     "react": "^18.3.1",
     "react-bootstrap": "^2.10.4",
     "react-dom": "^18.3.1",

frontend/src/App.test.tsx

@@ -1,9 +0,0 @@
-import React from 'react';
-import { render, screen } from '@testing-library/react';
-import App from './App';
-
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});

frontend/src/shared/utils/__tests__/getMedianOfCodeErrors.test.ts

@@ -0,0 +1,69 @@
+import { QuaggaJSResultObject } from "@ericblade/quagga2";
+import { getMedianOfCodeErrors } from "../getMedianOfCodeErrors";
+
+export const createMockQuaggaResult = (
+  decodedCodes: Array<{
+    error?: number;
+    code: number;
+    start: number;
+    end: number;
+  }> = []
+): QuaggaJSResultObject => ({
+  codeResult: {
+    code: "123456",
+    start: 0,
+    end: 10,
+    codeset: 1,
+    startInfo: {
+      error: 0,
+      code: 1,
+      start: 0,
+      end: 5,
+    },
+    decodedCodes,
+    endInfo: {
+      error: 0,
+      code: 1,
+      start: 5,
+      end: 10,
+    },
+    direction: 1,
+    format: "QR",
+  },
+  barcodes: [],
+  line: [{ x: 0, y: 0 }],
+  angle: 0,
+  pattern: [],
+  box: [],
+  boxes: [],
+});
+
+describe("getMedianOfCodeErrors", () => {
+  it("should return the median of code errors when there are valid errors", () => {
+    const result = createMockQuaggaResult([
+      { error: 1, code: 1, start: 0, end: 5 },
+      { error: 3, code: 1, start: 5, end: 10 },
+      { error: 2, code: 1, start: 0, end: 10 },
+    ]);
+
+    const median = getMedianOfCodeErrors(result);
+    expect(median).toBe(2); // The median of [1, 3, 2] is 2
+  });
+
+  it("should return undefined when there are no code errors", () => {
+    const result = createMockQuaggaResult([
+      { code: 1, start: 0, end: 5 }, // No error property
+      { code: 1, start: 5, end: 10 },
+    ]);
+
+    const median = getMedianOfCodeErrors(result);
+    expect(median).toBeUndefined();
+  });
+
+  it("should handle an empty decodedCodes array", () => {
+    const result = createMockQuaggaResult([]);
+
+    const median = getMedianOfCodeErrors(result);
+    expect(median).toBeUndefined();
+  });
+});

frontend/src/shared/utils/__tests__/useAuthentication.test.tsx

@@ -0,0 +1,66 @@
+import React from "react";
+import { render, waitFor, cleanup } from "@testing-library/react";
+import { AuthContext } from "../../../App";
+import { useAuth } from "../useAuthentication";
+
+const MockedComponent: React.FC = () => {
+  const { authenticated } = useAuth();
+  return <div>{authenticated}</div>;
+};
+
+let authenticated = false;
+const setAuthenticated = (args: boolean) => (authenticated = args);
+
+describe("useAuth", () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    cleanup();
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+    cleanup();
+  });
+
+  it("should set authenticated to true when fetch returns ok", async () => {
+    global.fetch = jest.fn(() => Promise.resolve({ ok: true })) as jest.Mock;
+
+    render(
+      <AuthContext.Provider value={{ authenticated, setAuthenticated }}>
+        <MockedComponent />
+      </AuthContext.Provider>
+    );
+
+    await waitFor(() => expect(fetch).toHaveBeenCalledTimes(1));
+
+    expect(authenticated).toBe(true);
+  });
+
+  it("should set authenticated to false when fetch returns not ok", async () => {
+    global.fetch = jest.fn(() => Promise.resolve({ ok: false })) as jest.Mock;
+
+    render(
+      <AuthContext.Provider value={{ authenticated, setAuthenticated }}>
+        <MockedComponent />
+      </AuthContext.Provider>
+    );
+
+    await waitFor(() => expect(fetch).toHaveBeenCalledTimes(1));
+
+    expect(authenticated).toBe(false);
+  });
+
+  it("should call fetch once", async () => {
+    global.fetch = jest.fn(() => Promise.resolve({ ok: false })) as jest.Mock;
+
+    render(
+      <AuthContext.Provider value={{ authenticated, setAuthenticated }}>
+        <MockedComponent />
+      </AuthContext.Provider>
+    );
+
+    await waitFor(() => {
+      expect(fetch).toHaveBeenCalledTimes(1);
+    });
+  });
+});

frontend/src/shared/utils/drawQuaggaProcessing.ts

@@ -0,0 +1,34 @@
+import Quagga, { QuaggaJSResultObject } from "@ericblade/quagga2";
+
+export const drawQuaggaProcessing = (result: QuaggaJSResultObject) => {
+  const drawingCtx = Quagga.canvas.ctx.overlay;
+  const drawingCanvas = Quagga.canvas.dom.overlay;
+  drawingCtx.font = "24px Arial";
+  drawingCtx.fillStyle = "green";
+  const width = drawingCanvas.getAttribute("width");
+  const height = drawingCanvas.getAttribute("height");
+
+  if (result) {
+    if (result.boxes && width && height) {
+      drawingCtx.clearRect(0, 0, parseInt(width), parseInt(height));
+      result.boxes
+        .filter((box) => box !== result.box)
+        .forEach((box) => {
+          Quagga.ImageDebug.drawPath(box, { x: 0, y: 1 }, drawingCtx, {
+            color: "purple",
+            lineWidth: 2,
+          });
+        });
+    }
+    if (result.box) {
+      Quagga.ImageDebug.drawPath(result.box, { x: 0, y: 1 }, drawingCtx, {
+        color: "blue",
+        lineWidth: 2,
+      });
+    }
+    if (result.codeResult && result.codeResult.code) {
+      drawingCtx.font = "24px Arial";
+      drawingCtx.fillText(result.codeResult.code, 10, 20);
+    }
+  }
+};

frontend/src/shared/utils/getMedianOfCodeErrors.ts

@@ -0,0 +1,20 @@
+import { QuaggaJSResultObject } from "@ericblade/quagga2";
+
+export const getMedianOfCodeErrors = (result: QuaggaJSResultObject) => {
+  const errors = result.codeResult.decodedCodes.flatMap((x) => x.error);
+  const medianOfErrors = getMedian(errors);
+  return medianOfErrors;
+};
+
+export const getMedian = (arr: (number | undefined)[]) => {
+  const newArr = [...arr].filter((x) => typeof x !== "undefined");
+  if (!newArr.length) {
+    return;
+  }
+  newArr.sort((a, b) => a! - b!);
+  const half = Math.floor(newArr.length / 2);
+  if (newArr.length % 2 === 1) {
+    return newArr[half];
+  }
+  return (newArr[half - 1]! + newArr[half]!) / 2;
+};

frontend/src/shared/utils/useAuthentication.ts

@@ -1,11 +1,10 @@
-import { useCallback, useContext } from "react";
+import { useCallback, useContext, useEffect } from "react";
 import { AuthContext } from "../../App";
-import { useQuery } from "@tanstack/react-query";
 
 type UseAuthHook = { authenticated: boolean };
 
 export const useAuth = (): UseAuthHook => {
-  const auth = useContext(AuthContext);
+  const { authenticated, setAuthenticated } = useContext(AuthContext);
 
   const authenticationCheck = useCallback(
     async () =>
@@ -16,17 +15,14 @@ export const useAuth = (): UseAuthHook => {
           "Content-Type": "application/json",
         },
       }).then((res) => {
-        auth.setAuthenticated?.(res.ok);
-        //react-query can't handle undefined without throwing a warning ...
-        return null;
+        setAuthenticated?.(res.ok);
       }),
-    [auth]
+    [setAuthenticated]
   );
 
-  useQuery({
-    queryFn: authenticationCheck,
-    queryKey: ["auth"],
-  });
+  useEffect(() => {
+    authenticationCheck();
+  }, [authenticationCheck]);
 
-  return auth;
+  return { authenticated };
 };

frontend/src/shared/utils/useScanner.ts

@@ -3,6 +3,8 @@ import Quagga, {
   QuaggaJSResultObject,
 } from "@ericblade/quagga2";
 import { useState, useCallback, useEffect } from "react";
+import { getMedianOfCodeErrors } from "./getMedianOfCodeErrors";
+import { drawQuaggaProcessing } from "./drawQuaggaProcessing";
 
 const constraints = {
   width: 640,
@@ -29,28 +31,6 @@ export const useScanner = ({
 
   const [scannerRef, setScannerRef] = useState<HTMLDivElement | null>(null);
 
-  const getMedian = useCallback((arr: (number | undefined)[]) => {
-    const newArr = [...arr].filter((x) => typeof x !== "undefined");
-    if (!newArr.length) {
-      return;
-    }
-    newArr.sort((a, b) => a! - b!);
-    const half = Math.floor(newArr.length / 2);
-    if (newArr.length % 2 === 1) {
-      return newArr[half];
-    }
-    return (newArr[half - 1]! + newArr[half]!) / 2;
-  }, []);
-
-  const getMedianOfCodeErrors = useCallback(
-    (result: QuaggaJSResultObject) => {
-      const errors = result.codeResult.decodedCodes.flatMap((x) => x.error);
-      const medianOfErrors = getMedian(errors);
-      return medianOfErrors;
-    },
-    [getMedian]
-  );
-
   const errorCheck = useCallback(
     (result: QuaggaJSResultObject) => {
       if (!onDetected) {
@@ -66,42 +46,9 @@ export const useScanner = ({
         onDetected(result.codeResult.code);
       }
     },
-    [getMedianOfCodeErrors, onDetected]
+    [onDetected]
   );
 
-  const handleProcessed = (result: QuaggaJSResultObject) => {
-    const drawingCtx = Quagga.canvas.ctx.overlay;
-    const drawingCanvas = Quagga.canvas.dom.overlay;
-    drawingCtx.font = "24px Arial";
-    drawingCtx.fillStyle = "green";
-    const width = drawingCanvas.getAttribute("width");
-    const height = drawingCanvas.getAttribute("height");
-
-    if (result) {
-      if (result.boxes && width && height) {
-        drawingCtx.clearRect(0, 0, parseInt(width), parseInt(height));
-        result.boxes
-          .filter((box) => box !== result.box)
-          .forEach((box) => {
-            Quagga.ImageDebug.drawPath(box, { x: 0, y: 1 }, drawingCtx, {
-              color: "purple",
-              lineWidth: 2,
-            });
-          });
-      }
-      if (result.box) {
-        Quagga.ImageDebug.drawPath(result.box, { x: 0, y: 1 }, drawingCtx, {
-          color: "blue",
-          lineWidth: 2,
-        });
-      }
-      if (result.codeResult && result.codeResult.code) {
-        drawingCtx.font = "24px Arial";
-        drawingCtx.fillText(result.codeResult.code, 10, 20);
-      }
-    }
-  };
-
   const getCameraId = useCallback(async () => {
     const stream = await navigator.mediaDevices.getUserMedia({
       video: { facingMode: "environment" },
@@ -150,7 +97,7 @@ export const useScanner = ({
           locate: true,
         },
         async (err) => {
-          Quagga.onProcessed(handleProcessed);
+          Quagga.onProcessed(drawQuaggaProcessing);
 
           if (err) {
             return console.error("Error starting Quagga:", err);
@@ -170,7 +117,7 @@ export const useScanner = ({
     await Quagga.CameraAccess.release();
     await Quagga.stop();
     Quagga.offDetected(errorCheck);
-    Quagga.offProcessed(handleProcessed);
+    Quagga.offProcessed(drawQuaggaProcessing);
   }, [errorCheck]);
 
   useEffect(() => {