Added tests to cover test email sends

- Also tweaked wording of 'E-mail' to 'Email' to remain consistent with
the rest of the app.

Related to #1696 and #1719

tests/TestEmailTest.php

@@ -0,0 +1,43 @@
+<?php namespace Tests;
+
+use BookStack\Notifications\TestEmail;
+use Illuminate\Support\Facades\Notification;
+
+class TestEmailTest extends TestCase
+{
+
+    public function test_a_send_test_button_shows()
+    {
+        $pageView = $this->asAdmin()->get('/settings/maintenance');
+        $formCssSelector = 'form[action$="/settings/maintenance/send-test-email"]';
+        $pageView->assertElementExists($formCssSelector);
+        $pageView->assertElementContains($formCssSelector . ' button', 'Send Test Email');
+    }
+
+    public function test_send_test_email_endpoint_sends_email_and_redirects_user_and_shows_notification()
+    {
+        Notification::fake();
+        $admin = $this->getAdmin();
+
+        $sendReq = $this->actingAs($admin)->post('/settings/maintenance/send-test-email');
+        $sendReq->assertRedirect('/settings/maintenance#image-cleanup');
+        $this->assertSessionHas('success', 'Email sent to ' . $admin->email);
+
+        Notification::assertSentTo($admin, TestEmail::class);
+    }
+
+    public function test_send_test_email_requires_settings_manage_permission()
+    {
+        Notification::fake();
+        $user = $this->getViewer();
+
+        $sendReq = $this->actingAs($user)->post('/settings/maintenance/send-test-email');
+        Notification::assertNothingSent();
+
+        $this->giveUserPermissions($user, ['settings-manage']);
+        $sendReq = $this->actingAs($user)->post('/settings/maintenance/send-test-email');
+        Notification::assertSentTo($user, TestEmail::class);
+    }
+
+
+}