Add HTML test with simple blog post

briar-desktop/src/test/kotlin/org/briarproject/briar/desktop/blog/TestSimplePost.kt

+/*
+ * Briar Desktop
+ * Copyright (C) 2023 The Briar Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.briarproject.briar.desktop.blog
+
+import org.intellij.lang.annotations.Language
+import org.jetbrains.annotations.NonNls
+
+fun main() = testHtml(testHtml)
+
+@NonNls
+@Language("HTML")
+private val testHtml = """
+        <h1>Headline</h1>some post text. Because we push the headlines
+        as paragraph and span style, this text appears on the next line, not on the
+        same as the headline.
+""".trimIndent()