Complete tests

[luvies]

take needs fully testing, and currently they are only partly done. specs that need completing:

• src/lib/arguments.ts
• src/lib/environment.ts
• src/lib/loader.ts
• src/lib/namespace.ts
• src/lib/options.ts
• src/lib/runner.ts
• src/lib/take-error.ts
• src/lib/take.ts
• src/lib/task.ts
• src/lib/utils.ts