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concatString.test.js
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concatString.test.js
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const concat = require('./concatString');
describe('Concatenation when two arguments are strings', ()=>{
it('When both are strings', () => {
expect(concat('this','boy')).toEqual('thisboy');
});
it('When one or both are character', () => {
expect(concat('T','girl')).toEqual('Tgirl');
});
});
test('Concatenation when the first argument is a number',()=>{
expect(concat(2,'girl')).toContain('error');
});
test('Concatenation when the second argument is a number',()=>{
expect(concat('girl',2)).toContain('error');
});
test('Concatenation when the first or/and second argument is a function',()=>{
expect(concat(Math.max(2,5,1,4),'book')).toContain('error');
});
test('Concatenation when the first or/and second argument is "undefined"',()=>{
expect(concat(undefined,'computer')).toContain('error');
});
test('Concatenation when the first or/and second argument is "null"',()=>{
expect(concat('computer',null)).toContain('error');
});
test('Concatenation when the first or/and second argument is an "object"',()=>{
expect(concat({'computer': 'window'}, 'null')).toContain('error');
});
test('Concatenation when the first or/and second argument is an "array"',()=>{
expect(concat(['two','three'], 'tree')).toContain('error');
});
test('Concatenation when the first or/and second argument is "boolean"',()=>{
expect(concat(true, 'tree')).toContain('error');
});
test('Concatenation when the first or/and second argument is an empty string',()=>{
expect(concat('', '')).toContain('error');
});
test('Concatenation when the first or/and second argument is NaN',()=>{
expect(concat('yam', NaN)).toContain('error');
});