InitializeCouchDBContainer prepares CouchDB running in docker for use by this mock.

NewTestContext creates a new *TestContext if mockStub and/or CouchDBMock are nil, then they are recreated, otherwise existing instance is reused (useful for mocking chaincode update with old data still present).

variant of ResponseError that accepts substring, not just a prefix.

ScanSomething scans a dir for yaml files and returns a map with keys being the file names without .yaml and values being the contents of the files as a map.