Using reload has made a big difference in my unit testing. I can run tests
repeatedly in unitTest.leo, even after I have changed (in leoPy.leo) the
code being tested.
This workflow about doubles my testing productivity. True test-driven
development is possible, here and now, in Leo.
The guidelines are simple:
1. @test nodes should use imp.reload(x) to reload all modules x affected by
the tests.
2. @test nodes must create new instances of all classes being tested.
When creating a new @test node, cutting and pasting code from previous unit
tests usually suffices. Fancy @button scripts that create preamble code are
not required, but might be useful if you are creating lots of tests at once.
The rest of the post will explain these guidelines in more detail, using
this example...
*Example*
Here is the beginning of @test elisp importer:
if 1: # Enable TDD
# The preamble...
g.cls()
if c.isChanged(): c.save()
# import leo
import leo.core.leoImport as leoImport
import leo.plugins.importers.linescanner as linescanner
import leo.plugins.importers.elisp
# Reload all.
import imp
imp.reload(leo.plugins.importers.linescanner)
imp.reload(leo.plugins.importers.elisp)
imp.reload(leoImport)
# instantiate the class
ic = leoImport.LeoImportCommands(c)
else: # Run the test in "production mode".
ic = c.importCommands
# run the test.
ic.elispUnitTest(p,s=s,showTree=True)
*Using imp reload*
As you can see, the test imports and reloads three modules. The test uses
leoImport, so it too must be reloaded even thought leoImport.py doesn't
change.
*Instantiating classes*
imp.reload is not enough. imp.reload doesn't change existing objects. You
must create (instantiate) new objects to test. This part of the example
shows how:
if 1: # Enable TDD
# The preamble, not shown...
# instantiate the class
ic = leoImport.LeoImportCommands(c)
else: # Run the test in "production mode".
ic = c.importCommands
# run the test.
ic.elispUnitTest(p,s=s,showTree=True)
And that's all there is to it. Creating the preamble as in the example is
an investment that quickly pays off. Give this kind of code a try. You'll
be glad you did.
Edward
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