increase test coverage

Author: christian-bromann

jest.config.js

@@ -7,10 +7,10 @@ module.exports = {
     },
     coverageThreshold: {
 		global: {
-			branches: 17,
-			functions: 28,
-			lines: 33,
-			statements: 33
+			branches: 20,
+			functions: 42,
+			lines: 47,
+			statements: 47
 		}
     }
 };

package-lock.json

@@ -26,6 +26,7 @@
   },
   "homepage": "https://github.com/saucelabs/docusaurus-code-references#readme",
   "devDependencies": {
+    "@types/jest": "^27.0.0",
     "@types/node": "^14.11.8",
     "@types/react": "^16.9.52",
     "@types/recursive-readdir": "^2.2.0",

package.json

@@ -79,7 +79,7 @@ async function fetchCode ({ url, fromLine, toLine }: GitHubReference, fetchResul
     })
 }
 
-function codeReducer (prevState: any, { type, value }: DispatchMessage) {
+export function codeReducer (prevState: any, { type, value }: DispatchMessage) {
     switch (type) {
         case 'reset': {
         return initialFetchResultState;

src/theme/ReferenceCodeBlock/index.tsx

@@ -1,9 +1,38 @@
 import { timeStamp } from 'console'
-import { parseReference } from '../src/theme/ReferenceCodeBlock/index'
+import { parseReference, codeReducer } from '../src/theme/ReferenceCodeBlock/index'
 
 test('should parse GitHub reference properly', () => {
     expect(parseReference('https://github.com/saucelabs/docusaurus-theme-github-codeblock/blob/main/src/theme/ReferenceCodeBlock/index.tsx'))
         .toMatchSnapshot()
     expect(parseReference('https://github.com/saucelabs/docusaurus-theme-github-codeblock/blob/main/src/theme/ReferenceCodeBlock/index.tsx#L105-L108'))
         .toMatchSnapshot()
 })
+
+test('codeReducer', () => {
+    const prevState = { foo: 'bar' }
+    expect(codeReducer(prevState, { type: 'reset', value: '' })).toMatchSnapshot()
+    expect(codeReducer(prevState, { type: 'loading', value: '' })).toMatchSnapshot()
+    expect(codeReducer(prevState, { type: 'loaded', value: 'foobar' })).toMatchSnapshot()
+    expect(codeReducer(prevState, { type: 'error', value: 'ups' })).toMatchSnapshot()
+    // @ts-expect-error
+    expect(codeReducer(prevState, { type: 'unknown', value: '' })).toEqual(prevState)
+})
+
+// export function codeReducer (prevState: any, { type, value }: DispatchMessage) {
+//     switch (type) {
+//         case 'reset': {
+//         return initialFetchResultState;
+//         }
+//         case 'loading': {
+//         return {...prevState, loading: true};
+//         }
+//         case 'loaded': {
+//         return {...prevState, code: value, loading: false};
+//         }
+//         case 'error': {
+//         return {...prevState, error: value, loading: false};
+//         }
+//         default:
+//         return prevState;
+//     }
+// }

tests/ReferenceCodeBlock.test.ts

@@ -1,5 +1,36 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`codeReducer 1`] = `
+Object {
+  "code": "loading...",
+  "error": null,
+  "loading": null,
+}
+`;
+
+exports[`codeReducer 2`] = `
+Object {
+  "foo": "bar",
+  "loading": true,
+}
+`;
+
+exports[`codeReducer 3`] = `
+Object {
+  "code": "foobar",
+  "foo": "bar",
+  "loading": false,
+}
+`;
+
+exports[`codeReducer 4`] = `
+Object {
+  "error": "ups",
+  "foo": "bar",
+  "loading": false,
+}
+`;
+
 exports[`should parse GitHub reference properly 1`] = `
 Object {
   "fromLine": 0,