add tests for base_email template

lib/plausible_web/email.ex

@@ -320,9 +320,9 @@ defmodule PlausibleWeb.Email do
     })
   end
 
-  defp base_email(), do: base_email(%{layout: "base_email.html"})
+  def base_email(), do: base_email(%{layout: "base_email.html"})
 
-  defp base_email(%{layout: layout}) do
+  def base_email(%{layout: layout}) do
     mailer_from = Application.get_env(:plausible, :mailer_email)
 
     new_email()

test/plausible_web/email_test.exs

@@ -0,0 +1,68 @@
+defmodule PlausibleWeb.EmailTest do
+  alias PlausibleWeb.Email
+  use ExUnit.Case, async: true
+  import Plausible.Factory
+
+  describe "base_email layout" do
+    test "greets user by first name if user in template assigns" do
+      email =
+        Email.base_email()
+        |> Email.render("activation_email.html", %{
+          user: build(:user, name: "John Doe"),
+          code: "123"
+        })
+
+      assert email.html_body =~ "Hey John,"
+    end
+
+    test "greets impersonally when user not in template assigns" do
+      email =
+        Email.base_email()
+        |> Email.render("password_reset_email.html", %{
+          reset_link: "imaginary"
+        })
+
+      assert email.html_body =~ "Hey,"
+    end
+
+    test "renders plausible link" do
+      email =
+        Email.base_email()
+        |> Email.render("cancellation_email.html")
+
+      assert email.html_body =~ plausible_link()
+    end
+
+    test "does not render unsubscribe placeholder by default" do
+      email =
+        Email.base_email()
+        |> Email.render("welcome_email.html")
+
+      refute email.html_body =~ "{{{ pm:unsubscribe }}}"
+    end
+
+    test "renders unsubscribe placeholder if told" do
+      email =
+        Email.base_email()
+        |> Email.render("welcome_email.html", %{unsubscribe: true})
+
+      assert email.html_body =~ "{{{ pm:unsubscribe }}}"
+    end
+
+    test "can be disabled with a nil layout" do
+      email =
+        Email.base_email(%{layout: nil})
+        |> Email.render("welcome_email.html", %{
+          user: build(:user, name: "John Doe")
+        })
+
+      refute email.html_body =~ "Hey John,"
+      refute email.html_body =~ plausible_link()
+    end
+  end
+
+  def plausible_link() do
+    plausible_url = PlausibleWeb.EmailView.plausible_url()
+    "<a href=\"#{plausible_url}\">#{plausible_url}</a>"
+  end
+end