make test on fresh clone failes due to undeclared dependencies

# Steps to reproduce

```
git clone https://github.com/caolan/nodeunit.git
cd nodeunit
make test
```

# Expected behaviour

All tests pass

# Actual behaviour

```
nodejs ./bin/nodeunit test
module.js:471
throw err;
^

Error: Cannot find module 'ejs'
at Function.Module._resolveFilename (module.js:469:15)
at Function.Module._load (module.js:417:25)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object. (/home/matthew/Documents/Projects/nodeunit/nodeunit/lib/reporters/junit.js:18:11)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
Makefile:148: recipe for target 'test' failed
make: *** [test] Error 1
```

# Commentary

The make script should run `npm install ejs` and `npm install should`, since those are dependencies.

I'm new to nodejs and Make files, so I'm not quite sure how to do this.

Comienza con el target de test del Makefile alrededor de la línea 148 e inspecciona cómo se declaran o instalan las dependencias. Reproduce el fallo de un clon nuevo, ten en cuenta las dependencias faltantes ejs y should, y confirma que make test pasa sin instalación manual.

Escrito por el modelo de indexación a partir del texto del issue.