5 - Testing Interactions

.github/workflows/test.yml

@@ -8,8 +8,8 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-24.04]
-        otp: [27.x]
-        elixir: [1.18.3]
+        otp: [26.1.2]
+        elixir: [1.15.7]
     services:
       postgres:
         image: postgres
@@ -44,4 +44,5 @@ jobs:
         run: |
           mix compile --force --
           mix test test/ranger_web/live/greet_live_test.exs
-          mix test test/ranger_web/live/avatar_live_test.exs   
+          mix test test/ranger_web/live/avatar_live_test.exs   
+          mix test test/ranger_web/live/counter_live_test.exs

test/ranger_web/live/counter_live_test.exs

@@ -2,4 +2,52 @@ defmodule RangerWeb.CounterLiveTest do
   use RangerWeb.ConnCase
 
   import Phoenix.LiveViewTest
+
+  @tag :good
+  test "user can increase count", %{conn: conn} do
+    {:ok, view, _html} = live(conn, ~p"/counter")
+
+    view
+    |> element("#increment")
+    |> render_click()
+
+    assert has_element?(view, "#count", "1")
+  end
+
+  @tag :ungood
+  test "user can increase count (less effective)", %{conn: conn} do
+    {:ok, view, _html} = live(conn, ~p"/counter")
+
+    html =
+      view
+      |> element("#increment")
+      |> render_click()
+
+    # this just asserts that "1" is somewhere in the html.
+    # ... which is a bit dumb.
+    assert html =~ "1"
+
+  end
+
+  @tag :ungood
+  test "user can increase counter (bypasses HTML - not good)", %{conn: conn} do
+    {:ok, view, _} = live(conn, ~p"/counter")
+
+    render_click(view, "increase")
+
+    assert has_element?(view, "#count", "1")
+  end
+
+
+  @tag :mine
+  test "user can decreease count", %{conn: conn} do
+    {:ok, view, html} = live(conn, ~p"/counter")
+
+    view
+    |> element("#decrement")
+    |> render_click()
+
+    assert has_element?(view, "#count", "-1")
+  end
+
 end