ADD: system tests for wiki edits (#7254)

* add system tests for wiki edits

* fix selector

test/system/post_test.rb

@@ -91,5 +91,24 @@ def assert_page_does_not_reload(message = "page should not reload")
     page.evaluate_script "document.body.classList.remove('not-reloaded')"
   end
 
+  test "edit wiki" do
+    visit '/wiki/wiki-page-path/'
+    click_on "Login"
+
+    fill_in 'user_session[username]', with: 'jeff'
+    fill_in 'user_session[password]', with: 'secretive'
+    click_on "Log in"
+    find('a.btn-circle:first-of-type .fa-pencil').click()
+    fill_in("body", with: "Test for editing wikis!")
+
+    # preview edits
+    find("a.preview-btn").click()
+    assert find("p", text: "Test for editing wikis!")
+
+    # publish edits
+    find("#publish").click()
+    assert find("p", text: "Test for editing wikis!")
+    assert find("div.alert-success", text: "Edits saved.")
+  end
 end