add tests to re utility

src/regexp/re/index.test.ts

@@ -0,0 +1,42 @@
+import { nameOf } from '../../../test/utils/nameOf';
+import { re } from './index';
+
+describe(nameOf(re), () => {
+  it('should build correct regular expressions', () => {
+    const test = (options: {
+      literalRegExp: RegExp;
+      stringRegExp: RegExp;
+      reRegExp: RegExp;
+      truthy: string[];
+      falsy: string[];
+    }): void => {
+      options.truthy.forEach((value) => {
+        expect(value.match(options.literalRegExp)).toBeTruthy();
+        expect(value.match(options.stringRegExp)).toBeTruthy();
+        expect(value.match(options.reRegExp)).toBeTruthy();
+      });
+
+      options.falsy.forEach((value) => {
+        expect(value.match(options.literalRegExp)).toBeFalsy();
+        expect(value.match(options.stringRegExp)).toBeFalsy();
+        expect(value.match(options.reRegExp)).toBeFalsy();
+      });
+    };
+
+    test({
+      literalRegExp: /^aab$/gu,
+      stringRegExp: new RegExp('^aab$', 'gu'),
+      reRegExp: re('^aab$', 'gu'),
+      falsy: ['aac', 'daab', 'AAB', '123', 'aabc'],
+      truthy: ['aab'],
+    });
+
+    test({
+      literalRegExp: /^\w{1,8}(\.[A-Za-z]{3})?$/gu,
+      stringRegExp: new RegExp('^\\w{1,8}(\\.[A-Za-z]{3})?$', 'gu'),
+      reRegExp: re('^\\w{1,8}(\\.[A-Za-z]{3})?$', 'gu'),
+      falsy: ['toolongname.exe', 'shext.e', 'ilch+2.123'],
+      truthy: ['EXPLORER.EXE', 'test.bin', 'noext'],
+    });
+  });
+});