added contract block to allow truffle-test single file execution

[mirathewhite]

Added a contract block to unit test files. This will let us run truffle test <filename> and npm run truffle-test -- [file].

[o-a-hudson]

I think this will mean for running all the tests that it will duplicate these tests as it will run in TestWrapper and the individual files

[o-a-hudson]

I think it's a bit confusing to separate the regular and upgraded tests. I think it would be nice to be able to run the test file and have it automatically run both the regular and upgraded tests for that file. What do you think of changing our test structure so that each file the has code you added but instead of running the tests in the file, the function passes run_tests as a parameter to a function in TestWrapper that runs run_tests on both the regular and upgraded tokens? So TestWrapper would only consist of a single function that simply ran whatever test set it was passed on a regular and upgraded token.

[mirathewhite]

I like that idea ... I'll update the PR

[mirathewhite]

Changes:

• TestWrapper exposes a single function execute that takes as input a run_tests function and the name of the test suite. execute will execute the run_tests function inside a contract block using a new token and an upgraded token.
• TestWrapper no longer executes any unit tests independently.
• Each unit test file calls TestWrapper.execute on its local run_tests function.
• npm run truffle-test will run all unit tests
• npm run truffle-test -- [filename] will run all the unit tests in the file on a new token and an upgraded token.

[o-a-hudson]

Both of these executions seem to be using the newUpgradedToken. Did you intend the first one to use the regular token?

[mirathewhite]

bloops!

[o-a-hudson]

See your change. Could you remove the merge commit (by using a rebase) in this PR? We're trying to avoid including merge commits in PRs going forward.