Update.

test/number/query.wren

@@ -0,0 +1,34 @@
+// retoor <retoor@molodetz.nl>
+
+System.print(0.isZero) // expect: true
+System.print(1.isZero) // expect: false
+System.print((-1).isZero) // expect: false
+
+System.print(5.isPositive) // expect: true
+System.print(0.isPositive) // expect: false
+System.print((-3).isPositive) // expect: false
+
+System.print((-7).isNegative) // expect: true
+System.print(0.isNegative) // expect: false
+System.print(3.isNegative) // expect: false
+
+System.print(42.isFinite) // expect: true
+System.print(0.isFinite) // expect: true
+System.print((1/0).isFinite) // expect: false
+System.print((0/0).isFinite) // expect: false
+
+System.print(4.isEven) // expect: true
+System.print(3.isEven) // expect: false
+System.print(0.isEven) // expect: true
+System.print(1.5.isEven) // expect: false
+
+System.print(3.isOdd) // expect: true
+System.print(4.isOdd) // expect: false
+System.print(0.isOdd) // expect: false
+System.print(1.5.isOdd) // expect: false
+
+System.print(5.isBetween(1, 10)) // expect: true
+System.print(1.isBetween(1, 10)) // expect: true
+System.print(10.isBetween(1, 10)) // expect: true
+System.print(0.isBetween(1, 10)) // expect: false
+System.print(11.isBetween(1, 10)) // expect: false