added a failing test example, for #35.

makefile

@@ -1,5 +1,5 @@
 test:
-	./uranium/scripts/uranium_standalone --uranium-dir=. test ${ARGS} -v -x
+	./uranium/scripts/uranium_standalone --uranium-dir=. test ${ARGS} -v -x -k develop_package_imports
 
 build:
 	./uranium/scripts/uranium_standalone --uranium-dir=.

tests/example_package/setup.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+import os
+import sys
+from setuptools import setup, find_packages
+
+setup(name='example',
+      description='example',
+      packages=find_packages(),
+      install_requires=[],
+      classifiers=[])

tests/test_packages_full.py

@@ -33,9 +33,14 @@ def main(build):
     assert exist == False
 """.strip()
 
+import os
 from uranium.scripts import execute_script
 from .conftest import URANIUM_SOURCE_ROOT
 
+EXAMPLE_PACKAGE_PATH = os.path.join(
+    os.path.dirname(__file__), "example_package"
+)
+
 
 def test_install(tmpdir):
     # we need to create a virtualenv
@@ -152,3 +157,28 @@ def main(build):
     print("stdout:\n" + str(out))
     print("stderr:\n" + str(err))
     assert code == 0
+
+
+def test_develop_package_imports(tmpdir):
+    """
+    a develop package should be importable immediately after installation
+    """
+
+    UBUILD = """
+import os
+
+def main(build):
+
+    build.packages.install("{package}", develop=True)
+    import example
+""".format(package=EXAMPLE_PACKAGE_PATH).strip()
+
+    # we need to create a virtualenv
+    tmpdir.join("ubuild.py").write(UBUILD)
+    code, out, err = execute_script(
+        "uranium_standalone", "--uranium-dir", URANIUM_SOURCE_ROOT,
+        cwd=tmpdir.strpath
+    )
+    print("stdout:\n" + str(out))
+    print("stderr:\n" + str(err))
+    assert code == 0