On Thu, Sep 15, 2011 at 6:42 AM, Chris Perkins <[email protected]>wrote:
> On Wednesday, September 14, 2011 11:19:13 AM UTC-4, Brian Hurt wrote:
>>
>> Say I have two name spaces, A and B, with A depending on B. I want to
>> test namespace A, replacing module B with a mock B for testing purposes-
>> preferably without having to load B at all (B sucks in a bunch of stuff,
>> like dependencies on databases and external web sites and etc. that I don't
>> want to deal with in testing). What is the easy, clojure-approved,
>> mechanism for doing this? I tried:
>>
>>
>>
> my-project
> |-- src
> | |-- A.clj
> | |-- B.clj
> | -- mocks
> | |-- B.clj
> |-- testdriver.clj
>
> # Run with the real B:
> java -cp clojure.jar:src clojure.main testdriver.clj
>
> # Run with the mock B:
> java -cp clojure.jar:mocks:src clojure.main testdriver.clj
>
> I don't know if my ascii-art directory tree makes any sense at all, but the
> point is that if you put "mocks" earlier in the classpath than "src", then
> the mock B
>
should get loaded instead of the real one.
>
This is the best answer so far, but it doesn't deal with the three-level
case- A depends upon B which depends upon C, and I want to test A without
sucking in B and C, and test B without sucking in C.
Maybe I'm asking the wrong question. If I have code that naturally
structures like:
+----------------+
| |
| A |
| |
+----------------+
| |
| B |
| |
+----------------+
| |
| C |
| |
+----------------+
| |
| Database |
| Or |
| Webservice |
| Or |
| Similar |
+----------------+
How *should* I structure this code for testing? I was assuming the natural
way to do this is to make A, B, and C separate name spaces but maybe this is
wrong.
The problem isn't just *writing* the code- I need to be able to change this
code later, and have some assurance it still works. So "load it up into a
repl and play with it" isn't a viable solution.
Or is clojure code just not testable/maintainable?
Brian
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