Add signed integers

source/lib/predicates/number.ts

@@ -180,4 +180,43 @@ export class NumberPredicate extends Predicate<number> {
 			validator: value => is.integer(value) && is.inRange(value, [start, end])
 		});
 	}
+
+	/**
+	 * Test a number to be in a valid range for a int8.
+	 */
+	get int8() {
+		const start = -128;
+		const end = 127;
+
+		return this.addValidator({
+			message: (value, label) => `Expected ${label} to be an integer in range [${start}..${end}], got ${value}`,
+			validator: value => is.integer(value) && is.inRange(value, [start, end])
+		});
+	}
+
+	/**
+	 * Test a number to be in a valid range for a int16.
+	 */
+	get int16() {
+		const start = -32768;
+		const end = 32767;
+
+		return this.addValidator({
+			message: (value, label) => `Expected ${label} to be an integer in range [${start}..${end}], got ${value}`,
+			validator: value => is.integer(value) && is.inRange(value, [start, end])
+		});
+	}
+
+	/**
+	 * Test a number to be in a valid range for a int32.
+	 */
+	get int32() {
+		const start = -2147483648;
+		const end = 2147483647;
+
+		return this.addValidator({
+			message: (value, label) => `Expected ${label} to be an integer in range [${start}..${end}], got ${value}`,
+			validator: value => is.integer(value) && is.inRange(value, [start, end])
+		});
+	}
 }

source/test/number.ts

@@ -106,3 +106,27 @@ test('number.uint32', t => {
 	t.throws(() => m(1.5, m.number.uint32), 'Expected number to be an integer in range [0..4294967295], got 1.5');
 	t.throws(() => m(4294967296, m.number.uint32), 'Expected number to be an integer in range [0..4294967295], got 4294967296');
 });
+
+test('number.int8', t => {
+	t.notThrows(() => m(-128, m.number.int8));
+	t.notThrows(() => m(127, m.number.int8));
+	t.throws(() => m(-129, m.number.int8), 'Expected number to be an integer in range [-128..127], got -129');
+	t.throws(() => m(1.5, m.number.int8), 'Expected number to be an integer in range [-128..127], got 1.5');
+	t.throws(() => m(128, m.number.int8), 'Expected number to be an integer in range [-128..127], got 128');
+});
+
+test('number.int16', t => {
+	t.notThrows(() => m(-32768, m.number.int16));
+	t.notThrows(() => m(32767, m.number.int16));
+	t.throws(() => m(-32769, m.number.int16), 'Expected number to be an integer in range [-32768..32767], got -32769');
+	t.throws(() => m(1.5, m.number.int16), 'Expected number to be an integer in range [-32768..32767], got 1.5');
+	t.throws(() => m(32768, m.number.int16), 'Expected number to be an integer in range [-32768..32767], got 32768');
+});
+
+test('number.int32', t => {
+	t.notThrows(() => m(-2147483648, m.number.int32));
+	t.notThrows(() => m(2147483647, m.number.int32));
+	t.throws(() => m(-2147483649, m.number.int32), 'Expected number to be an integer in range [-2147483648..2147483647], got -2147483649');
+	t.throws(() => m(1.5, m.number.int32), 'Expected number to be an integer in range [-2147483648..2147483647], got 1.5');
+	t.throws(() => m(2147483648, m.number.int32), 'Expected number to be an integer in range [-2147483648..2147483647], got 2147483648');
+});