Resolve umbrella project bugs (#16)

* Resolve umbrella project bugs

* My inner python is coming out... explicit is better than implicit

Author: gdwoolbert3

.tool-versions

@@ -1,2 +1,2 @@
-erlang 27.1.2
-elixir 1.17.3-otp-27
+erlang 27.2
+elixir 1.18.0-otp-27

lib/exposure.ex

@@ -15,7 +15,6 @@ defmodule Exposure do
 
   @snapshot_directory Application.compile_env(:exposure, :snapshot_directory, "_snapshots")
   @snapshot_test_tag Application.compile_env(:exposure, :snapshot_test_tag, :snapshot)
-  @test_paths Keyword.get(Mix.Project.config(), :test_paths, [])
 
   ################################
   # Public API
@@ -125,18 +124,31 @@ defmodule Exposure do
   end
 
   defp test_paths do
-    :persistent_term.get({__MODULE__, :test_paths})
+    key = {__MODULE__, Mix.Project.get!(), :test_paths}
+
+    case fetch_test_paths(key) do
+      {:ok, paths} -> paths
+      :error -> put_test_paths(key)
+    end
+  end
+
+  defp fetch_test_paths(key) do
+    {:ok, :persistent_term.get(key)}
   rescue
-    ArgumentError ->
-      paths =
-        @test_paths
-        |> maybe_add_default_path()
-        |> Enum.map(&Path.expand/1)
-        |> Enum.sort()
-        |> Enum.reduce([], &maybe_add_test_path/2)
-
-      :persistent_term.put({__MODULE__, :test_paths}, paths)
-      paths
+    ArgumentError -> :error
+  end
+
+  defp put_test_paths(key) do
+    paths =
+      Mix.Project.config()
+      |> Keyword.get(:test_paths, [])
+      |> maybe_add_default_path()
+      |> Enum.map(&Path.expand/1)
+      |> Enum.sort()
+      |> Enum.reduce([], &maybe_add_test_path/2)
+
+    :persistent_term.put(key, paths)
+    paths
   end
 
   defp maybe_add_default_path([]) do

mix.exs

@@ -1,7 +1,7 @@
 defmodule Exposure.MixProject do
   use Mix.Project
 
-  @version "1.0.0"
+  @version "1.1.0"
 
   ################################
   # Public API
@@ -21,7 +21,7 @@ defmodule Exposure.MixProject do
       description: description(),
       dialyzer: dialyzer(),
       docs: docs(),
-      elixir: "~> 1.16",
+      elixir: "~> 1.18",
       name: "Exposure",
       package: package(),
       preferred_cli_env: preferred_cli_env(),