🚧 Add handler for web of trust notifications

diff --git a/src/main/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandler.kt b/src/main/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandler.kt
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+++ b/src/main/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandler.kt
@@ -0,0 +1,40 @@
+/**
+ * Sone - WebOfTrustHandler.kt - Copyright © 2019 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.web.notification
+
+import com.google.common.eventbus.*
+import net.pterodactylus.sone.core.event.*
+import net.pterodactylus.util.notify.*
+
+/**
+ * Handler for web of trust-related notifications and the [WebOfTrustAppeared]
+ * and [WebOfTrustDisappeared] events.
+ */
+class WebOfTrustHandler(private val notificationManager: NotificationManager, private val notification: TemplateNotification) {
+
+       @Subscribe
+       fun webOfTrustAppeared(webOfTrustAppeared: WebOfTrustAppeared) {
+               notificationManager.removeNotification(notification)
+       }
+
+       @Subscribe
+       fun webOfTrustDisappeared(webOfTrustDisappeared: WebOfTrustDisappeared) {
+               notificationManager.addNotification(notification)
+       }
+
+}

diff --git a/src/test/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandlerTest.kt b/src/test/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandlerTest.kt
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+++ b/src/test/kotlin/net/pterodactylus/sone/web/notification/WebOfTrustHandlerTest.kt
@@ -0,0 +1,54 @@
+/**
+ * Sone - WebOfTrustHandlerTest.kt - Copyright © 2019 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.web.notification
+
+import com.google.common.eventbus.*
+import net.pterodactylus.sone.core.event.*
+import net.pterodactylus.util.notify.*
+import net.pterodactylus.util.template.*
+import org.hamcrest.MatcherAssert.*
+import org.hamcrest.Matchers.*
+import kotlin.test.*
+
+/**
+ * Unit test for [WebOfTrustHandler].
+ */
+class WebOfTrustHandlerTest {
+
+       private val eventBus = EventBus()
+       private val notificationManager = NotificationManager()
+       private val notification = TemplateNotification("", Template())
+
+       init {
+               eventBus.register(WebOfTrustHandler(notificationManager, notification))
+       }
+
+       @Test
+       fun `handler adds notification if wot goes down`() {
+               eventBus.post(WebOfTrustDisappeared())
+               assertThat(notificationManager.notifications, contains<Notification>(notification))
+       }
+
+       @Test
+       fun `handler removes notification if wot appears`() {
+               notificationManager.addNotification(notification)
+               eventBus.post(WebOfTrustAppeared())
+               assertThat(notificationManager.notifications, emptyIterable())
+       }
+
+}