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In the jargon, "autotesting" refers to a program that watches for changes to files. When it sees a file change, it reruns any tests that depend on the changed file. To be more exact: if namespace
FACTS depends on namespace
SOURCE, a change to
SOURCE will cause
FACTS to be reloaded. That will cause the facts in
FACTS to be rechecked.
Rechecking happens even if the dependency is indirect. If
FACTS depends on
INTERMEDIATE, which depends on
SOURCE, a change in
SOURCE will cause
FACT to be reloaded.
By default, Midje's autotesting tracks changes in a Leiningen project's
:source paths. Those defaults can be changed to arbitrary directories. Take care when choosing to track only some directories, since untracked directories can mean that some dependent files won't be reloaded. Consider the picture below, where the shaded directories are being tracked:
b.clj. It also happens that
a.clj. Now consider what happens when
a.clj changes. It's reloaded.
t_a.clj is reloaded because it depends on
b.clj is not reloaded because we didn't ask autotest to watch it. Further,
t_b.clj is also not reloaded, even though autotest is watching it, because autotest doesn't know of the indirect dependency through
Midje supports autotesting via the repl's
autotest command and
lein midje. Here's how you track the default directories:
user=> (midje.repl/autotest) % lein midje :autotest
If you're working on a source file and its fact file, track the containing directories:
user=> (midje.repl/autotest :dirs "test/subdir" "src/subdir") ; You can use `:dir` instead. % lein midje :autotest test/subdir src/subdir
At the moment, you can't track particular files within a directory: it's all or nothing.
Autotest supports filtering with metadata:
user=> (midje.repl/autotest :filter :core (complement :slow)) % lein midje :autotest :filter core -slow
In both cases you can use
:filters instead. The
dirs options can be combined, and used in either order.
By default, autotesting checks for changes twice each second. That can't be changed from the commmand line. It can be changed in the repl:
user=> (midje.repl/autotest :interval 1000)
Since intervals are measured in milliseconds, that checks once per second.