test: add tests for smtp mailer config

test/mv/config_smtp_test.exs

@@ -0,0 +1,129 @@
+defmodule Mv.ConfigSmtpTest do
+  @moduledoc """
+  Unit tests for Mv.Config SMTP-related helpers.
+
+  ENV overrides Settings (same pattern as OIDC/Vereinfacht). Uses real ENV and
+  Settings; no mocking so we test the actual precedence. async: false because
+  we mutate ENV.
+  """
+  use Mv.DataCase, async: false
+
+  describe "smtp_host/0" do
+    test "returns ENV value when SMTP_HOST is set" do
+      set_smtp_env("SMTP_HOST", "smtp.example.com")
+      assert Mv.Config.smtp_host() == "smtp.example.com"
+    after
+      clear_smtp_env()
+    end
+
+    test "returns nil when SMTP_HOST is not set and Settings have no smtp_host" do
+      clear_smtp_env()
+      assert Mv.Config.smtp_host() == nil
+    end
+  end
+
+  describe "smtp_port/0" do
+    test "returns parsed integer when SMTP_PORT ENV is set" do
+      set_smtp_env("SMTP_PORT", "587")
+      assert Mv.Config.smtp_port() == 587
+    after
+      clear_smtp_env()
+    end
+
+    test "returns nil or default when SMTP_PORT is not set" do
+      clear_smtp_env()
+      port = Mv.Config.smtp_port()
+      assert port == nil or (is_integer(port) and port in [25, 465, 587])
+    end
+  end
+
+  describe "smtp_configured?/0" do
+    test "returns true when smtp_host is present (from ENV or Settings)" do
+      set_smtp_env("SMTP_HOST", "smtp.example.com")
+      assert Mv.Config.smtp_configured?() == true
+    after
+      clear_smtp_env()
+    end
+
+    test "returns false when no SMTP host is set" do
+      clear_smtp_env()
+      refute Mv.Config.smtp_configured?()
+    end
+  end
+
+  describe "smtp_env_configured?/0" do
+    test "returns true when any SMTP ENV variable is set" do
+      set_smtp_env("SMTP_HOST", "smtp.example.com")
+      assert Mv.Config.smtp_env_configured?() == true
+    after
+      clear_smtp_env()
+    end
+
+    test "returns false when no SMTP ENV variables are set" do
+      clear_smtp_env()
+      refute Mv.Config.smtp_env_configured?()
+    end
+  end
+
+  describe "smtp_password/0 and SMTP_PASSWORD_FILE" do
+    test "returns value from SMTP_PASSWORD when set" do
+      set_smtp_env("SMTP_PASSWORD", "env-secret")
+      assert Mv.Config.smtp_password() == "env-secret"
+    after
+      clear_smtp_env()
+    end
+
+    test "returns content of file when SMTP_PASSWORD_FILE is set and SMTP_PASSWORD is not" do
+      clear_smtp_env()
+      path = Path.join(System.tmp_dir!(), "mv_smtp_test_#{System.unique_integer([:positive])}")
+      File.write!(path, "file-secret\n")
+      Process.put(:smtp_password_file_path, path)
+      set_smtp_env("SMTP_PASSWORD_FILE", path)
+      assert Mv.Config.smtp_password() == "file-secret"
+    after
+      clear_smtp_env()
+      if path = Process.get(:smtp_password_file_path), do: File.rm(path)
+    end
+
+    test "SMTP_PASSWORD overrides SMTP_PASSWORD_FILE when both are set" do
+      path = Path.join(System.tmp_dir!(), "mv_smtp_test_#{System.unique_integer([:positive])}")
+      File.write!(path, "file-secret")
+      Process.put(:smtp_password_file_path, path)
+      set_smtp_env("SMTP_PASSWORD_FILE", path)
+      set_smtp_env("SMTP_PASSWORD", "env-wins")
+      assert Mv.Config.smtp_password() == "env-wins"
+    after
+      clear_smtp_env()
+      if path = Process.get(:smtp_password_file_path), do: File.rm(path)
+    end
+  end
+
+  describe "smtp_*_env_set?/0" do
+    test "smtp_host_env_set? returns true when SMTP_HOST is set" do
+      set_smtp_env("SMTP_HOST", "x")
+      assert Mv.Config.smtp_host_env_set?() == true
+    after
+      clear_smtp_env()
+    end
+
+    test "smtp_password_env_set? returns true when SMTP_PASSWORD or SMTP_PASSWORD_FILE is set" do
+      set_smtp_env("SMTP_PASSWORD", "x")
+      assert Mv.Config.smtp_password_env_set?() == true
+    after
+      clear_smtp_env()
+    end
+  end
+
+  defp set_smtp_env(key, value) do
+    System.put_env(key, value)
+  end
+
+  defp clear_smtp_env do
+    System.delete_env("SMTP_HOST")
+    System.delete_env("SMTP_PORT")
+    System.delete_env("SMTP_USERNAME")
+    System.delete_env("SMTP_PASSWORD")
+    System.delete_env("SMTP_PASSWORD_FILE")
+    System.delete_env("SMTP_SSL")
+  end
+end