When trying to validate that a particular file exists after a run of
Packer in a test suite, we can use the FileExists checker that we
provide as part of the gadgets we added for the acceptance test suites.
This approach works well, but only if we can extract a file name
reliably from the output of Packer core, or if we know what to look for
exactly beforehand. For other cases with a generated name however, the
FileExists checker is not enough, and therefore to accomodate for those
cases, we are introducing a new checker for this purpose: FileGlob.
FileGlob, as its name suggests, runs a glob expression on the
filesystem, and returns an error if no match was found regarding this
glob expression.
Some tests will create files and directories as part of the execution
path for Packer, and we need a way to check this, so this commit adds a
new file gadget to do those checks after a command executes.
The lib name for the common components for writing packer_test suites
was not clear, and did not follow the convention established in Packer
core and plugins.
Therefore this commit does two things: first the lib is renamed into
common as to follow this convention, and clearly document which
components are common to all tests.
Also checkers are placed in a subpackage of common, common/check, so
that it is clearer what is meant to be used as checks for a command's
execution status after it's been run, as part of Assert.
Lucas Bajolet