ref: remove jest and lastn functions.test.js

It doesn't play well with webpack and it's babel config
and I couldn't find a way to make it work.

jest.config.js

@@ -1,9 +0,0 @@
-module.exports = {
-    moduleFileExtensions: [
-        'js'
-    ],
-    testMatch: [
-        '<rootDir>/react/**/?(*.)+(test)?(.web).js?(x)'
-    ],
-    verbose: true
-};

package.json

@@ -125,7 +125,6 @@
     "expose-loader": "0.7.5",
     "flow-bin": "0.104.0",
     "imports-loader": "0.7.1",
-    "jest": "26.1.0",
     "jetifier": "1.6.4",
     "metro-react-native-babel-preset": "0.56.0",
     "node-sass": "4.14.1",
@@ -145,7 +144,6 @@
   "scripts": {
     "lint": "eslint . && flow",
     "postinstall": "jetify",
-    "test": "jest",
     "validate": "npm ls"
   },
   "browser": {

react/features/base/lastn/functions.test.js

@@ -1,103 +0,0 @@
-import { limitLastN, validateLastNLimits } from './functions';
-
-describe('limitLastN', () => {
-    it('handles undefined mapping', () => {
-        expect(limitLastN(0, undefined)).toBe(undefined);
-    });
-    describe('when a correct limit mapping is given', () => {
-        const limits = new Map();
-
-        limits.set(5, -1);
-        limits.set(10, 8);
-        limits.set(20, 5);
-
-        it('returns undefined when less participants that the first limit', () => {
-            expect(limitLastN(2, limits)).toBe(undefined);
-        });
-        it('picks the first limit correctly', () => {
-            expect(limitLastN(5, limits)).toBe(-1);
-            expect(limitLastN(9, limits)).toBe(-1);
-        });
-        it('picks the middle limit correctly', () => {
-            expect(limitLastN(10, limits)).toBe(8);
-            expect(limitLastN(13, limits)).toBe(8);
-            expect(limitLastN(19, limits)).toBe(8);
-        });
-        it('picks the top limit correctly', () => {
-            expect(limitLastN(20, limits)).toBe(5);
-            expect(limitLastN(23, limits)).toBe(5);
-            expect(limitLastN(100, limits)).toBe(5);
-        });
-    });
-});
-
-describe('validateLastNLimits', () => {
-    describe('validates the input by returning undefined', () => {
-        it('if lastNLimits param is not an Object', () => {
-            expect(validateLastNLimits(5)).toBe(undefined);
-        });
-        it('if any key is not a number', () => {
-            const limits = {
-                'abc': 8,
-                5: -1,
-                20: 5
-            };
-
-            expect(validateLastNLimits(limits)).toBe(undefined);
-        });
-        it('if any value is not a number', () => {
-            const limits = {
-                8: 'something',
-                5: -1,
-                20: 5
-            };
-
-            expect(validateLastNLimits(limits)).toBe(undefined);
-        });
-        it('if any value is null', () => {
-            const limits = {
-                1: 1,
-                5: null,
-                20: 5
-            };
-
-            expect(validateLastNLimits(limits)).toBe(undefined);
-        });
-        it('if any value is undefined', () => {
-            const limits = {
-                1: 1,
-                5: undefined,
-                20: 5
-            };
-
-            expect(validateLastNLimits(limits)).toBe(undefined);
-        });
-        it('if the map is empty', () => {
-            expect(validateLastNLimits({})).toBe(undefined);
-        });
-    });
-    it('sorts by the keys', () => {
-        const mappingKeys = validateLastNLimits({
-            10: 5,
-            3: 3,
-            5: 4
-        }).keys();
-
-        expect(mappingKeys.next().value).toBe(3);
-        expect(mappingKeys.next().value).toBe(5);
-        expect(mappingKeys.next().value).toBe(10);
-        expect(mappingKeys.next().done).toBe(true);
-    });
-    it('converts keys and values to numbers', () => {
-        const mapping = validateLastNLimits({
-            3: 3,
-            5: 4,
-            10: 5
-        });
-
-        for (const key of mapping.keys()) {
-            expect(typeof key).toBe('number');
-            expect(typeof mapping.get(key)).toBe('number');
-        }
-    });
-});