Add regression tests for install module

These new tests will ensure the git hooks installation is
working from any folder reference within the project (e.g.
from root folder, deps path...)

Author: qgadrian

lib/mix/tasks/git_hooks/install.ex

@@ -45,7 +45,7 @@ defmodule Mix.Tasks.GitHooks.Install do
     Printer.info("Installing git hooks...")
 
     mix_path = Config.mix_path()
-    project_path = Application.get_env(:git_hooks, :project_path, "")
+    project_path = Application.get_env(:git_hooks, :project_path, GitPath.resolve_app_path())
 
     ensure_hooks_folder_exists()
     clean_missing_hooks()

test/mix/tasks/git_hooks/install_test.exs

@@ -44,6 +44,43 @@ defmodule Mix.Tasks.InstallTest do
 
       Application.delete_env(:git_hooks, :project_path)
     end
+
+    test "installs git hooks when run from the project root", %{tmp_dir: project_path} do
+      put_git_hook_config(
+        [:pre_commit, :pre_push],
+        tasks: {:cmd, "check"}
+      )
+
+      hooks_file = Install.run(["--dry-run", "--quiet"])
+
+      assert hooks_file == [
+               pre_commit: expect_hook_template("pre_commit", project_path),
+               pre_push: expect_hook_template("pre_push", project_path)
+             ]
+    end
+
+    test "installs git hooks when run from the dependency directory", %{tmp_dir: project_path} do
+      # Simulate being in the dependency directory
+      deps_git_hooks_dir = Path.join([project_path, "deps", "git_hooks"])
+      File.mkdir_p!(deps_git_hooks_dir)
+
+      File.cd!(deps_git_hooks_dir, fn ->
+        # Need to reset the config cache because Application env might be cached
+        Application.delete_env(:git_hooks, :project_path)
+
+        put_git_hook_config(
+          [:pre_commit, :pre_push],
+          tasks: {:cmd, "check"}
+        )
+
+        hooks_file = Install.run(["--dry-run", "--quiet"])
+
+        assert hooks_file == [
+                 pre_commit: expect_hook_template("pre_commit", project_path),
+                 pre_push: expect_hook_template("pre_push", project_path)
+               ]
+      end)
+    end
   end
 
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