Add mocha.md

pages/common/mocha.md

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+# mocha
+
+> Execute Mocha JavaScript test runner
+
+- Run tests with default configuration or as configured in `mocha.opts`
+
+`mocha`
+
+- Run tests contained at a specific location
+
+`mocha {{folder/with/tests}}`
+
+- Run tests that match a specific grep pattern
+
+`mocha --grep {{^regex$}}`
+
+- Run tests on changes to JavaScript files in the current directory and once initially
+
+`mocha --watch`
+
+- Run tests with a specific reporter
+
+`mocha --reporter {{reporter}}`