clean up file/directory interaction, add some tests

spec/foreman/cli_spec.rb

@@ -34,6 +34,15 @@ describe "Foreman::CLI", :fakefs do
         subject.start("alpha")
       end
     end
+
+    describe "with an alternate root" do
+      it "reads the Procfile from that root" do
+        write_procfile "/some/app/Procfile"
+        mock(Foreman::Procfile).new("/some/app/Procfile")
+        mock.instance_of(Foreman::Engine).start
+        foreman %{ start -d /some/app }
+      end
+    end
   end
 
   describe "export" do

spec/foreman/engine_spec.rb

@@ -49,6 +49,14 @@ describe "Foreman::Engine", :fakefs do
     end
   end
 
+  describe "directories" do
+    it "has the directory default relative to the Procfile" do
+      write_procfile "/some/app/Procfile"
+      engine = Foreman::Engine.new("/some/app/Procfile")
+      engine.directory.should == "/some/app"
+    end
+  end
+
   describe "environment" do
     before(:each) do
       write_procfile
@@ -97,6 +105,15 @@ describe "Foreman::Engine", :fakefs do
       engine.environment.should == {"FOO"=>"qoo"}
       engine.start
     end
+
+    it "should be loaded relative to the Procfile" do
+      FileUtils.mkdir_p "/some/app"
+      File.open("/some/app/.env", "w") { |f| f.puts("FOO=qoo") }
+      write_procfile "/some/app/Procfile"
+      engine = Foreman::Engine.new("/some/app/Procfile")
+      engine.environment.should == {"FOO"=>"qoo"}
+      engine.start
+    end
   end
 
   describe "utf8" do