test: introduce Jest to the project, closes covidatlas#43 (covidatlas#44

)

* Add jest
* Add tests for parse.js
* Add Github Action workflow for testing

.babelrc

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "current"
+        }
+      }
+    ]
+  ]
+}

.github/workflows/test.yml

@@ -0,0 +1,32 @@
+name: Test CI
+
+on: push
+
+jobs:
+  build:
+    runs-on: [macOS-latest]
+    steps:
+      - uses: actions/checkout@v1 # without submodules
+        with:
+          persist-credentials: false
+      - name: Disable the keychain credential helper
+        run: git config --global credential.helper ""
+      - name: Enable the local store credential helper
+        run: git config --global --add credential.helper store
+      - name: Add credential
+        run: echo "https://x-access-token:${{ secrets.GIT_SECRET }}@github.com" >> ~/.git-credentials
+      - name: Tell git to use https instead of ssh whenever it encounters it
+        run: 'git config --global url."https://github.com/".insteadof [email protected]:'
+      - name: Update submodules
+        run: |
+          git submodule update --init
+      - name: Use Node.js 13.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: '13.x'
+      - name: Install
+        run: |
+          yarn
+      - name: Test
+        run: |
+          yarn test

lib/parse.js

@@ -5,7 +5,7 @@ function number(string) {
   if (string === '') {
     return 0;
   }
-  return parseInt(string.replace(/[^\d]/g, ''), 10);
+  return parseInt(string.replace(/[^\d\-]/g, ''), 10);
 }
 
 /*
@@ -19,10 +19,15 @@ function float(string) {
 }
 
 /*
-  Remove line breaks, double spaces, zero-width space, asterisk, and trim the provided stirng
+  Remove line breaks, double spaces, zero-width space, asterisk, and trim the provided string
 */
 function string(string) {
-  return string.replace(/\n/g, ' ').replace(/\s+/, ' ').replace(/\u200B/g,'').replace(/\*/, '').trim();
+  return string
+    .replace(/\n/g, ' ')
+    .replace(/\s+/, ' ')
+    .replace(/\u200B/g, '')
+    .replace(/\*/g, '')
+    .trim();
 }
 
 export { number, float, string };

lib/parse.test.js

@@ -0,0 +1,55 @@
+import each from 'jest-each';
+
+import * as parse from './parse';
+
+describe('Parse functions', () => {
+  describe('number', () => {
+    const tests = [
+      ['', 0],
+      ['0', 0],
+      ['1', 1],
+      ['-1', -1],
+      ['10', 10],
+      ['1.1', 11],
+      ['-1.1', -11],
+      ['25abc', 25],
+      ['as-12asdasd', -12]
+    ];
+    each(tests).test('when passed "%s", it returns %d', (str, expected) => {
+      expect(parse.number(str)).toBe(expected);
+    });
+  });
+
+  describe('float', () => {
+    const tests = [
+      ['', 0],
+      ['0', 0],
+      ['1', 1],
+      ['-1', -1],
+      ['10', 10],
+      ['1.1', 1.1],
+      ['-1.1', -1.1],
+      ['25abc', 25],
+      ['as-12asdasd', -12]
+    ];
+    each(tests).test('when passed "%s", it returns %d', (str, expected) => {
+      expect(parse.float(str)).toBe(expected);
+    });
+  });
+
+  describe('string', () => {
+    const tests = [
+      ['', ''],
+      ['should not change', 'should not change'],
+      ['0', '0'],
+      ['****test', 'test'],
+      ['this is some text\nsecond line', 'this is some text second line'],
+      ['this  some test', 'this some test'],
+      ['this is padded text          ', 'this is padded text'],
+      ['        this is padded text', 'this is padded text']
+    ];
+    each(tests).test('when passed "%s", it returns "%s"', (str, expected) => {
+      expect(parse.string(str)).toBe(expected);
+    });
+  });
+});

package.json

@@ -15,16 +15,24 @@
     "buildSite": "cp -r site/* dist/",
     "deploy": "npm run dateData && npm run deploySite",
     "dateData": "DATE=$(date +'%Y-%m-%d') && cp dist/data.json dist/data-$DATE.json && cp dist/features.json dist/features-$DATE.json && cp dist/data.csv dist/data-$DATE.csv",
-    "deploySite": "npm run buildSite && gh-pages -a -d dist/ -e ."
+    "deploySite": "npm run buildSite && gh-pages -a -d dist/ -e .",
+    "test": "jest"
   },
   "dependencies": {
     "@turf/turf": "^5.1.6",
     "cheerio": "^1.0.0-rc.3",
     "csv": "^5.3.2",
     "editorconfig": "^0.15.3",
     "gh-pages": "^2.2.0",
+    "jest-each": "^25.1.0",
     "needle": "^2.3.3",
     "puppeteer": "^2.1.1",
     "yargs": "^15.3.0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.8.7",
+    "@babel/preset-env": "^7.8.7",
+    "babel-jest": "^25.1.0",
+    "jest": "^25.1.0"
   }
 }