Add unit tests for isHex and isHexStrict. (#3622)

Co-authored-by: Gregory Markou <16929357+GregTheGreek@users.noreply.github.com>

test/utils.isHex.js

@@ -0,0 +1,34 @@
+var chai = require('chai');
+var utils = require('../packages/web3-utils');
+
+var BigNumber = require('bignumber.js');
+var BN = require('bn.js');
+
+var assert = chai.assert;
+
+var tests = [
+    { value: 1, expected: true },
+    { value: '1', expected: true },
+    { value: '0xH', expected: false},
+    { value: 'H', expected: false},
+    { value: [1,2,3,{test: 'data'}], expected: false},
+    { value: {test: 'test'}, expected: false},
+    { value: '{"test": "test"}', expected: false},
+    { value: 'myString', expected: false},
+    { value: 'myString 34534!', expected: false},
+    { value: new BN(15), expected: false},
+    { value: new BigNumber(15), expected: false},
+    { value: 'Heeäööä👅D34ɝɣ24Єͽ-.,äü+#/', expected: false},
+    { value: true, expected: false},
+    { value: false, expected: false}
+];
+
+describe('lib/utils/utils', function () {
+    describe('isHex', function () {
+        tests.forEach(function (test) {
+            it('should return ' + test.expected + ' for input ' + test.value, function () {
+                assert.strictEqual(utils.isHex(test.value), test.expected);
+            });
+        });
+    });
+});

test/utils.isHexStrict.js

@@ -0,0 +1,34 @@
+var chai = require('chai');
+var utils = require('../packages/web3-utils');
+
+var BigNumber = require('bignumber.js');
+var BN = require('bn.js');
+
+var assert = chai.assert;
+
+var tests = [
+    { value: 0x1, expected: false },  //0x1 would be tested as 1
+    { value: '0x1', expected: true },
+    { value: '0xH', expected: false},
+    { value: 'H', expected: false},
+    { value: [1,2,3,{test: 'data'}], expected: false},
+    { value: {test: 'test'}, expected: false},
+    { value: '{"test": "test"}', expected: false},
+    { value: 'myString', expected: false},
+    { value: 'myString 34534!', expected: false},
+    { value: new BN(15), expected: false},
+    { value: new BigNumber(15), expected: false},
+    { value: 'Heeäööä👅D34ɝɣ24Єͽ-.,äü+#/', expected: false},
+    { value: true, expected: false},
+    { value: false, expected: false}
+];
+
+describe('lib/utils/utils', function () {
+    describe('isHexStrict', function () {
+        tests.forEach(function (test) {
+            it('should return ' + test.expected + ' for input ' + test.value, function () {
+                assert.strictEqual(utils.isHexStrict(test.value), test.expected);
+            });
+        });
+    });
+});