Jest setup for demo website

demo/babel.config.json

@@ -0,0 +1,7 @@
+{
+    "presets": [
+        "@babel/preset-env",
+        "@babel/preset-typescript",
+        "@babel/preset-react"
+    ]
+}

demo/jest.config.ts

@@ -0,0 +1,203 @@
+/**
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+import type { Config } from "jest";
+
+const config: Config = {
+    // All imported modules in your tests should be mocked automatically
+    // automock: false,
+
+    // Stop running tests after `n` failures
+    // bail: 0,
+
+    // The directory where Jest should store its cached dependency information
+    // cacheDirectory: "/private/var/folders/tl/mq0ry9mn37n2_djks873jbj80000gn/T/jest_dx",
+
+    // Automatically clear mock calls, instances, contexts and results before every test
+    clearMocks: true,
+
+    // Indicates whether the coverage information should be collected while executing the test
+    collectCoverage: false,
+
+    // An array of glob patterns indicating a set of files for which coverage information should be collected
+    // collectCoverageFrom: undefined,
+
+    // The directory where Jest should output its coverage files
+    coverageDirectory: "coverage",
+
+    // An array of regexp pattern strings used to skip coverage collection
+    // coveragePathIgnorePatterns: [
+    //   "/node_modules/"
+    // ],
+
+    // Indicates which provider should be used to instrument code for coverage
+    // coverageProvider: "babel",
+
+    // A list of reporter names that Jest uses when writing coverage reports
+    // coverageReporters: [
+    //   "json",
+    //   "text",
+    //   "lcov",
+    //   "clover"
+    // ],
+
+    // An object that configures minimum threshold enforcement for coverage results
+    // coverageThreshold: undefined,
+
+    displayName: "jsdom tests for demo website",
+    // A path to a custom dependency extractor
+    // dependencyExtractor: undefined,
+
+    // Make calling deprecated APIs throw helpful error messages
+    // errorOnDeprecated: false,
+
+    // The default configuration for fake timers
+    // fakeTimers: {
+    //   "enableGlobally": false
+    // },
+
+    // Force coverage collection from ignored files using an array of glob patterns
+    // forceCoverageMatch: [],
+
+    // A path to a module which exports an async function that is triggered once before all test suites
+    // globalSetup: undefined,
+
+    // A path to a module which exports an async function that is triggered once after all test suites
+    // globalTeardown: undefined,
+
+    // A set of global variables that need to be available in all test environments
+    // globals: {},
+
+    // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+    // maxWorkers: "50%",
+
+    // An array of directory names to be searched recursively up from the requiring module's location
+    // moduleDirectories: ["node_modules", "../src", "../dist"],
+
+    // An array of file extensions your modules use
+    // moduleFileExtensions: [
+    //   "js",
+    //   "mjs",
+    //   "cjs",
+    //   "jsx",
+    //   "ts",
+    //   "tsx",
+    //   "json",
+    //   "node"
+    // ],
+
+    // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+    moduleNameMapper: {
+        // Force module roughjs to resolve with the CJS entry point, because Jest does not support package.json.exports. Elaborated in PR#15.
+        roughjs: require.resolve("roughjs"),
+    },
+
+    // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+    // modulePathIgnorePatterns: [],
+
+    // Activates notifications for test results
+    // notify: false,
+
+    // An enum that specifies notification mode. Requires { notify: true }
+    // notifyMode: "failure-change",
+
+    // A preset that is used as a base for Jest's configuration
+    // preset: undefined,
+
+    // Run tests from one or more projects
+    // projects: undefined,
+
+    // Use this configuration option to add custom reporters to Jest
+    // reporters: undefined,
+
+    // Automatically reset mock state before every test
+    // resetMocks: false,
+
+    // Reset the module registry before running each individual test
+    // resetModules: false,
+
+    // A path to a custom resolver
+    // resolver: undefined,
+
+    // Automatically restore mock state and implementation before every test
+    // restoreMocks: false,
+
+    // The root directory that Jest should scan for tests and modules within
+    // rootDir: undefined,
+
+    // A list of paths to directories that Jest should use to search for files in
+    // roots: [
+    //   "<rootDir>"
+    // ],
+
+    // Allows you to use a custom runner instead of Jest's default test runner
+    // runner: "jest-runner",
+
+    // The paths to modules that run some code to configure or set up the testing environment before each test
+    // setupFiles: [],
+
+    // A list of paths to modules that run some code to configure or set up the testing framework before each test
+    setupFilesAfterEnv: ["jest-canvas-mock"],
+
+    // The number of seconds after which a test is considered as slow and reported as such in the results.
+    // slowTestThreshold: 5,
+
+    // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+    // snapshotSerializers: [],
+
+    // The test environment that will be used for testing
+    testEnvironment: "jsdom",
+
+    // Options that will be passed to the testEnvironment
+    // testEnvironmentOptions: {},
+
+    // Adds a location field to test results
+    // testLocationInResults: false,
+
+    // The glob patterns Jest uses to detect test files
+    // testMatch: [
+    //   "**/__tests__/**/*.[jt]s?(x)",
+    //   "**/?(*.)+(spec|test).[tj]s?(x)"
+    // ],
+
+    // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+    // testPathIgnorePatterns: [
+    //   "/node_modules/"
+    // ],
+
+    // The regexp pattern or array of patterns that Jest uses to detect test files
+    // testRegex: [],
+
+    // This option allows the use of a custom results processor
+    // testResultsProcessor: undefined,
+
+    // This option allows use of a custom test runner
+    // testRunner: "jest-circus/runner",
+
+    // A map from regular expressions to paths to transformers
+    // transform: {
+    //     "^.+\\.(ts|tsx|js|jsx)$": "babel-jest",
+    // },
+
+    // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+    // transformIgnorePatterns: [
+    //   "/node_modules/",
+    //   "\\.pnp\\.[^\\/]+$"
+    // ],
+
+    // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+    // unmockedModulePathPatterns: undefined,
+
+    // Indicates whether each individual test should be reported during the run
+    // verbose: undefined,
+
+    // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+    // watchPathIgnorePatterns: [],
+
+    // Whether to use watchman for file crawling
+    // watchman: true,
+};
+
+export default config;

demo/package.json

@@ -3,7 +3,8 @@
     "version": "0.1.0",
     "description": "Demo website for memory-models-rough",
     "scripts": {
-        "test": "echo \"Error: no test specified\" && exit 1",
+        "test": "jest --no-cache",
+        "test-cov": "jest --no-cache --coverage",
         "build-dev": "webpack",
         "start": "webpack serve"
     },
@@ -23,17 +24,22 @@
         "@babel/preset-env": "^7.23.6",
         "@babel/preset-react": "^7.23.3",
         "@babel/preset-typescript": "^7.23.3",
+        "@testing-library/react": "^14.2.1",
         "@types/react": "^18.2.45",
         "@types/react-dom": "^18.2.18",
+        "babel-jest": "^29.7.0",
         "babel-loader": "^9.1.3",
         "css-loader": "^6.8.1",
         "html-webpack-plugin": "^5.6.0",
+        "jest-canvas-mock": "^2.5.2",
+        "jest-environment-jsdom": "^29.7.0",
         "style-loader": "^3.3.3",
         "typescript": "^5.3.3",
         "webpack": "^5.89.0",
         "webpack-cli": "^5.1.4"
     },
     "dependencies": {
+        "@emotion/styled": "^11.11.0",
         "@mui/material": "^5.15.7",
         "@picocss/pico": "^1.5.10",
         "react": "^18.2.0",

demo/src/App.tsx

@@ -12,7 +12,7 @@ export default function App() {
         try {
             setJsonResult(JSON.parse(formData));
         } catch (error) {
-            console.error("Error parsing inputted JSON: ", error);
+            console.error(`Error parsing inputted JSON: ${error.message}`);
             setJsonResult(null);
         }
     };
@@ -26,7 +26,13 @@ export default function App() {
             />
             <section>
                 <h2>Output</h2>
-                <ErrorBoundary fallback={<div>Something went wrong</div>}>
+                <ErrorBoundary
+                    fallback={
+                        <div data-testid="svg-display-error-boundary">
+                            Something went wrong
+                        </div>
+                    }
+                >
                     <SvgDisplay jsonResult={jsonResult} />
                 </ErrorBoundary>
             </section>

demo/src/MemoryModels.tsx

@@ -1,13 +1,21 @@
 import React from "react";
 import { Button, Card, CardContent, TextField, Grid } from "@mui/material";
 
-export default function MemoryModelsUserInput(props) {
+type MemoryModelsUserInputPropTypes = {
+    onSubmit: (event: React.MouseEvent<HTMLFormElement>) => void;
+    setFormData: React.Dispatch<React.SetStateAction<string>>;
+    formData: string;
+};
+
+export default function MemoryModelsUserInput(
+    props: MemoryModelsUserInputPropTypes
+) {
     const handleTextFieldChange = (event) => {
         props.setFormData(event.target.value);
     };
 
     return (
-        <form onSubmit={props.onSubmit}>
+        <form data-testid="input-form" onSubmit={props.onSubmit}>
             <Card>
                 <CardContent>
                     <Grid container spacing={2}>
@@ -18,7 +26,6 @@ export default function MemoryModelsUserInput(props) {
                                 multiline
                                 fullWidth
                                 rows={10}
-                                maxRows={20}
                                 variant="outlined"
                                 value={props.formData}
                                 onChange={handleTextFieldChange}
@@ -31,8 +38,10 @@ export default function MemoryModelsUserInput(props) {
                         <Grid item xs={12}>
                             <Button
                                 type="submit"
+                                data-testid="input-submit-button"
                                 variant="contained"
                                 color="primary"
+                                disabled={!props.formData}
                                 style={{ textTransform: "none" }}
                             >
                                 Draw Diagram

demo/src/SvgDisplay.tsx

@@ -1,7 +1,11 @@
 import React, { useRef, useEffect } from "react";
 import mem from "../../src/index"; // TODO: replace with import of the package after it's been published
 
-export default function SvgDisplay(props) {
+type SvgDisplayPropTypes = {
+    jsonResult: object;
+};
+
+export default function SvgDisplay(props: SvgDisplayPropTypes) {
     const canvasRef = useRef(null);
 
     useEffect(() => {
@@ -13,8 +17,11 @@ export default function SvgDisplay(props) {
     }, [props.jsonResult]);
 
     return (
-        <>
-            <canvas ref={canvasRef} width={1000} height={1000} />;
-        </>
+        <canvas
+            data-testid="memory-models-canvas"
+            ref={canvasRef}
+            width={1000}
+            height={1000}
+        />
     );
 }

demo/src/__tests__/App.spec.tsx

@@ -0,0 +1,44 @@
+import React from "react";
+import { fireEvent, render, screen } from "@testing-library/react";
+import App from "../App";
+
+describe("App", () => {
+    beforeEach(() => {
+        render(<App />);
+    });
+
+    it("renders Output heading", () => {
+        expect(screen.getByText("Output").nodeName).toEqual("H2");
+    });
+
+    it("renders ErrorBoundary fallback element when draw function throws error", () => {
+        jest.mock("../../../src/index", () => ({
+            draw: jest.fn(() => {
+                throw new Error();
+            }),
+        }));
+        const input = screen.getByLabelText("Enter memory model JSON here");
+        // In order to get to draw function, input has to be valid json otherwise JSON.parse fails
+        fireEvent.change(input, { target: { value: "[{}]" } });
+        const button = screen.getByTestId("input-submit-button");
+        fireEvent.click(button);
+
+        const errorBoundary = screen.getByTestId("svg-display-error-boundary");
+        expect(errorBoundary.textContent).toEqual("Something went wrong");
+    });
+
+    it("calls console error when the input is not valid JSON", () => {
+        const consoleErrorSpy = jest
+            .spyOn(console, "error")
+            .mockImplementation();
+
+        const input = screen.getByLabelText("Enter memory model JSON here");
+        fireEvent.change(input, { target: { value: "*&#*#(@(!(" } });
+        const button = screen.getByTestId("input-submit-button");
+        fireEvent.click(button);
+
+        expect(consoleErrorSpy).toHaveBeenCalledWith(
+            expect.stringMatching(/^Error parsing inputted JSON: /)
+        );
+    });
+});