Add a find_modpack test.

tests/data/mod_game/mods/extra_parent/modpack1/mod1/mod.conf

@@ -0,0 +1 @@
+name = mod1

tests/data/modpack_game/mods/extra_parent/modpack1/mod1/mod.conf

@@ -0,0 +1 @@
+name = mod1

tests/data/modpack_game/mods/extra_parent/modpack1/mod1/not_this_folder/init.lua

@@ -0,0 +1 @@
+-- This represents a backup of init.lua that should be ignored by the test.

tests/data/modpack_game/mods/extra_parent/modpack1/modpack.conf

@@ -0,0 +1 @@
+name = modpack1

tests/data/modpack_game/mods/extra_parent/modpack2/mod2/mod.conf

@@ -0,0 +1 @@
+name = mod2

tests/data/modpack_game/mods/extra_parent/modpack2/mod2/not_this_folder/init.lua

@@ -0,0 +1 @@
+-- This represents a backup of init.lua that should be ignored by the test.

tests/data/modpack_game/mods/extra_parent/modpack2/modpack.conf

@@ -0,0 +1 @@
+name = modpack2

tests/test_mtpatches.py

@@ -14,6 +14,7 @@ from pyenliven.mtpatches import (  # noqa F402
     get_shallowest_files_sub,
     diff_only_head,
     find_mod,
+    find_modpack,
 )
 
 
@@ -97,6 +98,11 @@ class TestMTPatches(unittest.TestCase):
             find_mod(game_path, "mod1"),
             os.path.join("mods", "extra_parent", "modpack1", "mod1")
         )
+        self.assertEqual(
+            find_mod(os.path.join(TESTS_DATA_DIR, "modpack_game"), "mod2"),
+            os.path.join("mods", "extra_parent", "modpack2", "mod2")
+        )
+
         self.assertEqual(
             find_mod(os.path.join(game_path, "mods", "extra_parent",
                                   "modpack1", "mod1"),
@@ -108,6 +114,40 @@ class TestMTPatches(unittest.TestCase):
             os.path.join("extra_parent", "modpack1", "mod1"),
         )
 
+    def test_find_modpack(self):
+        game_path = os.path.join(TESTS_DATA_DIR, "modpack_game")
+        self.assertEqual(
+            find_modpack(game_path, "wrong_modpack"),
+            None
+        )
+        self.assertEqual(
+            find_modpack(game_path, "modpack1"),
+            os.path.join("mods", "extra_parent", "modpack1")
+        )
+        self.assertEqual(
+            find_modpack(os.path.join(TESTS_DATA_DIR, "modpack_game"),
+                         "modpack2"),
+            os.path.join("mods", "extra_parent", "modpack2")
+        )
+
+        self.assertEqual(
+            find_modpack(os.path.join(game_path, "mods", "extra_parent",
+                                      "modpack1"),
+                         "modpack1"),  # Yes, still find mod1 ("") if root
+            ""
+        )
+        self.assertEqual(
+            find_modpack(os.path.join(game_path, "mods", "extra_parent",
+                                      "modpack2"),
+                         "modpack2"),  # Yes, still find mod1 ("") if root
+            ""
+        )
+
+        self.assertEqual(
+            find_modpack(os.path.join(game_path, "mods"), "modpack1"),
+            os.path.join("extra_parent", "modpack1"),
+        )
+
 
 if __name__ == "__main__":
     unittest.main()