add unit-test for FLOOR.PRECISE formula

add changes into formula calculation

cell/.unit-tests/FormulaTests.js

@@ -766,7 +766,31 @@ $( function () {
 		strictEqual( oParser.calculate().getValue(), "#VALUE!", 'SECH("test")' );
 	} );
 
-
+	test( "Test: \"FLOOR.PRECISE\"", function () {
+		oParser = new parserFormula( 'FLOOR.PRECISE(-3.2, -1)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(-3.2, -1)' );
+		strictEqual( oParser.calculate().getValue(), -4, 'FLOOR.PRECISE(-3.2, -1)' );
+
+		oParser = new parserFormula( 'FLOOR.PRECISE(3.2, 1)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(3.2, 1)' );
+		strictEqual( oParser.calculate().getValue(), 3, 'FLOOR.PRECISE(3.2, 1)' );
+
+		oParser = new parserFormula( 'FLOOR.PRECISE(-3.2, 1)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(-3.2, 1)' );
+		strictEqual( oParser.calculate().getValue(), -4, 'FLOOR.PRECISE(-3.2, 1)' );
+
+		oParser = new parserFormula( 'FLOOR.PRECISE(3.2, -1)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(3.2, -1)' );
+		strictEqual( oParser.calculate().getValue(), 3, 'FLOOR.PRECISE(3.2, -1)' );
+
+		oParser = new parserFormula( 'FLOOR.PRECISE(3.2)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(3.2)' );
+		strictEqual( oParser.calculate().getValue(), 3, 'FLOOR.PRECISE(3.2)' );
+
+		oParser = new parserFormula( 'FLOOR.PRECISE(test)', "A1", ws );
+		ok( oParser.parse(), 'FLOOR.PRECISE(test)' );
+		strictEqual( oParser.calculate().getValue(), "#NAME?", 'FLOOR.PRECISE(test)' );
+	} );
 
 	test( "Test: \"ARABIC('LVII')\"", function () {
 		oParser = new parserFormula( 'ARABIC("LVII")', "A1", ws );

cell/model/FormulaObjects/mathematicFunctions.js

@@ -1554,9 +1554,9 @@
 				return new cNumber(0.0);
 			}
 
-			var sign = number > 0 ? 1 : -1;
-			var quotient = Math.abs(number / significance);
-			return new cNumber(sign * Math.floor(quotient) * Math.abs(significance));
+			var absSignificance = Math.abs(significance);
+			var quotient = number / absSignificance;
+			return new cNumber(Math.floor(quotient) * absSignificance);
 		}
 
 		if (arg0 instanceof cArray && arg1 instanceof cArray) {