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(

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 ); } ); } );

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