Implement unit tests for utility functions that perform type/value checks

test/unit/util_spec.js

@@ -14,8 +14,8 @@
  */
 
 import {
-  bytesToString, ReadableStream, removeNullCharacters, stringToBytes,
-  stringToPDFString
+  bytesToString, isArrayBuffer, isBool, isEmptyObj, isNum, isSpace, isString,
+  ReadableStream, removeNullCharacters, stringToBytes, stringToPDFString
 } from '../../src/shared/util';
 
 describe('util', function() {
@@ -50,6 +50,92 @@ describe('util', function() {
     });
   });
 
+  describe('isArrayBuffer', function() {
+    it('handles array buffer values', function() {
+      expect(isArrayBuffer(new ArrayBuffer(0))).toEqual(true);
+      expect(isArrayBuffer(new Uint8Array(0))).toEqual(true);
+    });
+
+    it('handles non-array buffer values', function() {
+      expect(isArrayBuffer('true')).toEqual(false);
+      expect(isArrayBuffer(1)).toEqual(false);
+      expect(isArrayBuffer(null)).toEqual(false);
+      expect(isArrayBuffer(undefined)).toEqual(false);
+    });
+  });
+
+  describe('isBool', function() {
+    it('handles boolean values', function() {
+      expect(isBool(true)).toEqual(true);
+      expect(isBool(false)).toEqual(true);
+    });
+
+    it('handles non-boolean values', function() {
+      expect(isBool('true')).toEqual(false);
+      expect(isBool('false')).toEqual(false);
+      expect(isBool(1)).toEqual(false);
+      expect(isBool(0)).toEqual(false);
+      expect(isBool(null)).toEqual(false);
+      expect(isBool(undefined)).toEqual(false);
+    });
+  });
+
+  describe('isEmptyObj', function() {
+    it('handles empty objects', function() {
+      expect(isEmptyObj({})).toEqual(true);
+    });
+
+    it('handles non-empty objects', function() {
+      expect(isEmptyObj({ foo: 'bar', })).toEqual(false);
+    });
+  });
+
+  describe('isNum', function() {
+    it('handles numeric values', function() {
+      expect(isNum(1)).toEqual(true);
+      expect(isNum(0)).toEqual(true);
+      expect(isNum(-1)).toEqual(true);
+      expect(isNum(1000000000000000000)).toEqual(true);
+      expect(isNum(12.34)).toEqual(true);
+    });
+
+    it('handles non-numeric values', function() {
+      expect(isNum('true')).toEqual(false);
+      expect(isNum(true)).toEqual(false);
+      expect(isNum(null)).toEqual(false);
+      expect(isNum(undefined)).toEqual(false);
+    });
+  });
+
+  describe('isSpace', function() {
+    it('handles space characters', function() {
+      expect(isSpace(0x20)).toEqual(true);
+      expect(isSpace(0x09)).toEqual(true);
+      expect(isSpace(0x0D)).toEqual(true);
+      expect(isSpace(0x0A)).toEqual(true);
+    });
+
+    it('handles non-space characters', function() {
+      expect(isSpace(0x0B)).toEqual(false);
+      expect(isSpace(null)).toEqual(false);
+      expect(isSpace(undefined)).toEqual(false);
+    });
+  });
+
+  describe('isString', function() {
+    it('handles string values', function() {
+      expect(isString('foo')).toEqual(true);
+      expect(isString('')).toEqual(true);
+    });
+
+    it('handles non-string values', function() {
+      expect(isString(true)).toEqual(false);
+      expect(isString(1)).toEqual(false);
+      expect(isString(null)).toEqual(false);
+      expect(isString(undefined)).toEqual(false);
+    });
+  });
+
   describe('stringToBytes', function() {
     it('handles non-string arguments', function() {
       expect(function() {