add tests for BETA.INV

cell/.unit-tests/FormulaTests.js

@@ -1042,6 +1042,18 @@ $( function () {
 		strictEqual( oParser.calculate().getValue().toFixed(6) - 0, 0.068094, "GAMMA.DIST(A2,A3,A4,TRUE)" );
 	} );
 
+	test( "Test: \"BETA.INV\"", function () {
+		ws.getRange2( "A2" ).setValue( "0.685470581" );
+		ws.getRange2( "A3" ).setValue( "8" );
+		ws.getRange2( "A4" ).setValue( "10" );
+		ws.getRange2( "A5" ).setValue( "1" );
+		ws.getRange2( "A6" ).setValue( "3" );
+
+		oParser = new parserFormula( "BETA.INV(A2,A3,A4,A5,A6)", "A1", ws );
+		ok( oParser.parse(), "BETA.INV(A2,A3,A4,A5,A6)" );
+		strictEqual( oParser.calculate().getValue().toFixed(1) - 0, 2, "BETA.INV(A2,A3,A4,A5,A6)" );
+	} );
+
 	test( "Test: \"GAMMA.INV\"", function () {
 		ws.getRange2( "A2" ).setValue( "0.068094" );
 		ws.getRange2( "A3" ).setValue( "9" );