deftest is a macro. Macros are expanded at compile time. So, in this case, at compile time, a function called namespace2 is def'd with meta data :test set to the body of your deftest.
All of that body is namespace resolved in macro expansion, before in-ns is ever executed (which happens when you actually call the namespace2 function created by the macro). Put another way, (def anything 10) is namespace resolved to (def learn.clojure.test.core/anything 10) at macro expansion time (compile time), before the test function is ever called, and thereby before in-ns is ever executed. Hope this helps. - Mark On Mon, Aug 15, 2011 at 5:07 PM, Richard Rattigan <ratti...@gmail.com> wrote: > I'm finding that namespaces don't seem to behave as I expect > intuitively, or according to the reference. It's quite possible I'm in > the wrong here though, as I'm just kicking clojure's tires at this > point. > > Here is the relevant doc: > > http://clojure.org/special_forms > (def symbol init?) > Creates and interns or locates a global var with the name of symbol > and a namespace of the value of the current namespace (*ns*). > > In the test below, which succeeds, the var does not appear to end up > in the "current namespace" per this definition. Am I misinterpreting > something, or is this a deviation from the spec/reference? > > (ns learn.clojure.test.core > (:use [clojure.test])) > (deftest namespace2 > (in-ns 'my.new.namespace) > ;confirm the current namespace > (is (= "my.new.namespace" (str *ns*))) > ;attempt to def a var in the current namespace > (def anything 10) > ;the var is not defined in the current namespace > (is (nil? (ns-resolve *ns* 'anything))) > ;the var is however definined in the orginal namespace > (is (not (nil? (ns-resolve (find-ns 'learn.clojure.test.core) > 'anything)))) > (is (= 10 learn.clojure.test.core/anything))) > > On Aug 15, 1:42 pm, Alan Malloy <a...@malloys.org> wrote: >> On Aug 15, 6:16 am, Richard Rattigan <ratti...@gmail.com> wrote: >> >> >> >> >> >> >> >> >> >> > I don't understand why this test would fail - can anyone explain why? >> >> > (ns learn.clojure.test.core >> > (:use [clojure.test])) >> > (deftest namespaces >> > (in-ns 'my.new.namespace) >> > (is (= "my.new.namespace" (str *ns*))) >> > (is (= `anything 'my.new.namespace/anything))) >> >> > expected: (= (quote learn.clojure.test.core/anything) (quote >> > my.new.namespace/anything)) >> > actual: (not (= learn.clojure.test.core/anything my.new.namespace/ >> > anything)) >> >> > When I try this on the REPL, it seems to work as expected: >> >> > user=> (in-ns 'my.new.namespace) >> > #<Namespace my.new.namespace> >> > my.new.namespace=> `anything >> > my.new.namespace/anything >> >> The syntax quoting happens at read time, before in-ns is executed. You >> can do something similar at the repl: >> >> user=> (do (in-ns 'tmp) `foo) >> user/foo > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
