diff --git a/lib/ex_factor/extractor.ex b/lib/ex_factor/extractor.ex
index c849775..98e4ef8 100644
--- a/lib/ex_factor/extractor.ex
+++ b/lib/ex_factor/extractor.ex
@@ -5,20 +5,24 @@ defmodule ExFactor.Extractor do
   alias ExFactor.Parser
 
   def emplace(files, opts) do
-    source_path = Keyword.get(opts, :source_path)
     source_module = Keyword.get(opts, :source_module)
     target_module = Keyword.get(opts, :target_module)
-    target_path = Keyword.get(opts, :target_path)
     source_function = Keyword.get(opts, :source_function)
     arity = Keyword.get(opts, :arity)
     target_function = Keyword.get(opts, :target_function, source_function)
 
-    Macro.underscore(source_module)
+    target_path = Keyword.get(opts, :target_path, path(target_module))
+    |> IO.inspect(label: "target_path")
+    source_path = Keyword.get(opts, :source_path, path(source_module))
+    # Macro.underscore(source_module)
+
+    # source_path = Macro.underscore(source_module) <> ".ex"
     # target_path = Macro.underscore(target_module) <> ".ex"
-    Path.join([Mix.Project.app_path(), target_path])
+
+    # Path.join([Mix.Project.app_path(), target_path])
     # |> IO.inspect(label: "")
 
-    File.exists?(source_path) |> IO.inspect(label: "")
+    File.exists?(source_path) |> IO.inspect(label: "exists")
 
     {_ast, functions} = Parser.public_functions(source_path)
 
@@ -48,4 +52,8 @@ defmodule ExFactor.Extractor do
         File.write(target_path, content)
     end
   end
+
+  defp path(module) do
+    Path.join(["lib", Macro.underscore(module) <> ".ex"])
+  end
 end
diff --git a/test/ex_factor/extractor_test.exs b/test/ex_factor/extractor_test.exs
index 2d5ae3a..933a3c3 100644
--- a/test/ex_factor/extractor_test.exs
+++ b/test/ex_factor/extractor_test.exs
@@ -44,7 +44,7 @@ defmodule ExFactor.ExtractorTest do
 
   test "write a new file with the function, infer some defaults" do
     content = """
-    defmodule ExFactorSampleModule do
+    defmodule ExFactor.SourceModule do
       @somedoc "This is somedoc"
       # no aliases
       def pub1(arg1) do
@@ -53,23 +53,23 @@ defmodule ExFactor.ExtractorTest do
     end
     """
 
-    File.write("test/support/source_module.ex", content)
-    target_path = "test/support/target_module.ex"
+    File.write("lib/ex_factor/source_module.ex", content)
 
     opts = [
-      target_path: target_path,
-      target_module: ExFactor.NewMod,
-      source_module: ExFactorSampleModule,
-      source_path: "test/support/source_module.ex",
+      target_module: ExFactor.TargetModule,
+      source_module: ExFactor.SourceModule,
       source_function: :pub1,
       arity: 1
     ]
 
-    path = Path.join([Mix.Project.app_path(), "lib", target_path <> ".ex"])
-    Extractor.emplace(["test/support/source_module.ex"], opts)
+    # path = Path.join([Mix.Project.app_path(), "lib", target_path <> ".ex"])
+    Extractor.emplace(["lib/ex_factor/source_module.ex"], opts)
 
-    file = File.read!(target_path) |> IO.inspect(label: "target_path")
+    file = File.read!("lib/ex_factor/target_module.ex")
     assert file =~ "def(pub1(arg1))"
-    assert file =~ "defmodule(ExFactor.NewMod) do"
+    assert file =~ "defmodule(ExFactor.TargetModule) do"
+
+    File.rm("lib/ex_factor/source_module.ex")
+    File.rm("lib/ex_factor/target_module.ex")
   end
 end