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Q write a Calculator class that matches this specification

describe( “Calculator”, function(){

var calculator;

beforeEach( function(){

calculator = new Calculator();

} );

it( “adds 1 and 2”, function(){

expect( calculator.add( 1, 2 ) ).to.equal( 3 );

} );

it( “subtracts 2 from 9”, function(){

expect( calculator.subtract( 9, 2 ) ).to.equal( 7 );

} );

it( “multiplies 4 and 3”, function(){

expect( calculator.multiply( 4, 3 ) ).to.equal( 12 );

} );

it( “divides 10 by 2”, function(){

expect( calculator.divide( 10, 2 ) ).to.equal( 5 );

} );

it( “does not divide by 0”, function(){

expect( calculator.divide( 5, 0 ) ).to.equal( NaN );

} ); } );