Fixes #27.

tests/tester.nim

@@ -1,9 +1,17 @@
-import osproc, unittest, strutils
+import osproc, unittest, strutils, os
 
 const path = "../src/babel"
 
 discard execCmdEx("nimrod c " & path)
 
+template cd*(dir: string, body: stmt) =
+  ## Sets the current dir to ``dir``, executes ``body`` and restores the
+  ## previous working dir.
+  let lastDir = getCurrentDir()
+  setCurrentDir(dir)
+  body
+  setCurrentDir(lastDir)
+
 test "can install packagebin2":
   let (outp, exitCode) = execCmdEx(path & " install -y https://github.com/babel-test/packagebin2.git")
   check exitCode == QuitSuccess
@@ -19,3 +27,15 @@ test "can reject same version dependencies":
 test "can update":
   let (outp, exitCode) = execCmdEx(path & " update")
   check exitCode == QuitSuccess
+
+test "issue #27":
+  # Install b
+  cd "issue27/b":
+    check execCmdEx("../../" & path & " install -y").exitCode == QuitSuccess
+
+  # Install a
+  cd "issue27/a":
+    check execCmdEx("../../" & path & " install -y").exitCode == QuitSuccess
+
+  cd "issue27":
+    check execCmdEx("../" & path & " install -y").exitCode == QuitSuccess