There's one insidious thing about no tests when dealing with dynamic languages: when you have no tests, no one knows what data looks like (typical code: `bigJson = getBigJsonFromServer()`). Is 'foobar' an array or string? What kind of string is it exactly? Can it be null, or it will be "unknown"? Put two years of cowboy coding on top and you're screwed.
Of course you can create unit tests with fake data, though IMO it's a bad practice. I think it's best to have unit tests working on real production-like data (in addition to have edge-casey-data tested as well).
Of course you can create unit tests with fake data, though IMO it's a bad practice. I think it's best to have unit tests working on real production-like data (in addition to have edge-casey-data tested as well).