Add cypress

cypress.config.js

@@ -0,0 +1,7 @@
+const { defineConfig } = require("cypress");
+
+module.exports = defineConfig({
+  e2e: {
+    baseUrl: "http://localhost:8080/",
+  },
+});

cypress/e2e/calculator.cy.js

@@ -0,0 +1,38 @@
+describe("Claculator", () => {
+  beforeEach(() => {
+    cy.visit("/");
+  });
+
+  it("shows default calculation", () => {
+    cy.get("[data-test=matrix] input").should("have.length", 16);
+    cy.get("[data-test=kernel] input").should("have.length", 9);
+    cy.get("[data-test=result] input").should("have.length", 16);
+  });
+
+  it("shows result when matrix changes", () => {
+    cy.get("[data-test=matrix] input").first().type(2);
+    cy.get("[data-test=result] input").first().should("have.value", 5);
+  });
+
+  it("shows result when kernel changes", () => {
+    cy.get("[data-test=kernel] input").first().type(2);
+    cy.get("[data-test=result] input").last().should("have.value", 5);
+  });
+
+  it("can change matrix size", () => {
+    cy.get("[data-test=matrix-size] input").first().type(2);
+    cy.get("[data-test=matrix-size] input").last().type(2);
+    cy.get("[data-test=matrix] input").should("have.length", 4);
+  });
+
+  it("can change kernel size", () => {
+    cy.get("[data-test=kernel-size] input").first().type(2);
+    cy.get("[data-test=kernel-size] input").last().type(2);
+    cy.get("[data-test=kernel] input").should("have.length", 4);
+  });
+
+  it("can toggle padding", () => {
+    cy.get("[data-test=padding]").click();
+    cy.get("[data-test=result] input").should("have.length", 4);
+  });
+});

cypress/e2e/theme.cy.js

@@ -0,0 +1,45 @@
+const visit = (darkAppearance) =>
+  cy.visit("/", {
+    onBeforeLoad(win) {
+      cy.stub(win, "matchMedia")
+        .withArgs("(prefers-color-scheme: dark)")
+        .returns({
+          matches: darkAppearance,
+          addEventListener: () => {},
+          removeEventListener: () => {},
+        });
+    },
+  });
+
+const isDarkMode = () => {
+  cy.get("html").should("have.attr", "theme", "dark");
+  cy.get("html").should("have.css", "background-color", "rgb(51, 51, 51)");
+  cy.get("html").should("have.css", "color", "rgb(238, 238, 238)");
+};
+
+const isLightMode = () => {
+  cy.get("html").should("have.attr", "theme", "light");
+  cy.get("html").should("have.css", "background-color", "rgb(255, 255, 255)");
+  cy.get("html").should("have.css", "color", "rgb(51, 51, 51)");
+};
+
+describe("Theme", () => {
+  it("is dark by default", () => {
+    cy.visit("/");
+    isDarkMode();
+  });
+
+  it("is light if user has set it in the browser", () => {
+    visit(false);
+    isLightMode();
+  });
+
+  it("can toggle", () => {
+    visit(true);
+    isDarkMode();
+    cy.get("[data-test=toggle-theme]").click();
+    isLightMode();
+    cy.get("[data-test=toggle-theme]").click();
+    isDarkMode();
+  });
+});

cypress/fixtures/example.json

@@ -0,0 +1,5 @@
+{
+  "name": "Using fixtures to represent data",
+  "email": "hello@cypress.io",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}

cypress/support/commands.js

@@ -0,0 +1,25 @@
+// ***********************************************
+// This example commands.js shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add('login', (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add('drag', { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add('dismiss', { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This will overwrite an existing command --
+// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })

cypress/support/e2e.js

@@ -0,0 +1,20 @@
+// ***********************************************************
+// This example support/e2e.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.js using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')

package.json

@@ -6,11 +6,13 @@
     "build": "rollup -c",
     "dev": "rollup -c -w",
     "start": "sirv public --no-clear",
-    "deploy": "gh-pages -d public"
+    "deploy": "gh-pages -d public",
+    "cypress:open": "cypress open"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^17.0.0",
     "@rollup/plugin-node-resolve": "^11.0.0",
+    "cypress": "^10.3.1",
     "rollup": "^2.3.4",
     "rollup-plugin-css-only": "^3.1.0",
     "rollup-plugin-livereload": "^2.0.0",

src/App.svelte

@@ -68,10 +68,10 @@
       <h5 style="grid-area: matrix-title">Matrix</h5>
       <h5 style="grid-area: kernel-title">Kernel</h5>
       <h5 style="grid-area: result-title">Result</h5>
-      <div style="grid-area: matrix-size">
+      <div style="grid-area: matrix-size" data-test="matrix-size">
         <MatrixSizeInput bind:matrixWidth bind:matrixHeight />
       </div>
-      <div style="grid-area: kernel-size">
+      <div style="grid-area: kernel-size" data-test="kernel-size">
         <MatrixSizeInput
           bind:matrixWidth={kernelWidth}
           bind:matrixHeight={kernelHeight}
@@ -80,14 +80,22 @@
       <div style="grid-area: result-size">
         {result[0].length} &times; {result.length}
       </div>
-      <div style="grid-area: matrix"><Matrix bind:matrix /></div>
-      <div style="grid-area: kernel"><Matrix bind:matrix={kernel} /></div>
-      <div style="grid-area: result">
+      <div style="grid-area: matrix" data-test="matrix">
+        <Matrix bind:matrix />
+      </div>
+      <div style="grid-area: kernel" data-test="kernel">
+        <Matrix bind:matrix={kernel} />
+      </div>
+      <div style="grid-area: result" data-test="result">
         <Matrix matrix={result} readonly="true" />
       </div>
       <div style="grid-area: padding">
         <label>
-          <input type="checkbox" bind:checked={addPadding} />
+          <input
+            type="checkbox"
+            bind:checked={addPadding}
+            data-test="padding"
+          />
           Padding
         </label>
         <div>

src/ThemeToggle.svelte

@@ -3,15 +3,15 @@
   let { toggle, current } = getContext("theme");
 </script>
 
-<button on:click={toggle} title="Toggle Theme">
+<button on:click={toggle} title="Toggle Theme" data-test="toggle-theme">
   <slot>{$current}</slot>
 </button>
 
 <style>
-    button {
-        border: none;
-        background: none;
-        font-weight: 600;
-        cursor: pointer;
-    }
-</style>
+  button {
+    border: none;
+    background: none;
+    font-weight: 600;
+    cursor: pointer;
+  }
+</style>