ci(tests): add convert tests0.2.1

Adding these tests also exposed an issue within the Markdown converter!

The issue was that if a Markdown file **did not** have whitespace lines
between elements, no whitespace lines were inserted at all into the
converted result, leaving everything on one massive line (except lists).

2 files changed, 79 insertions, 9 deletions

diff --git a/src/convert/markdown.rs b/src/convert/markdown.rs
index ccd2304..9bc0e6c 100644
--- a/src/convert/markdown.rs
+++ b/src/convert/markdown.rs
@@ -25,21 +25,21 @@ pub fn convert(source: Vec<Node>) -> String {
   // this AST tree to an alternative markup format.
   for node in source {
     match node {
-      Node::Text(text) => markdown.push_str(&text),
+      Node::Text(text) => markdown.push_str(&format!("{}\n", text)),
       Node::Link {
         to,
         text,
       } =>
         markdown.push_str(&*text.map_or_else(
-          || format!("<{}>", to),
-          |text| format!("[{}]({})", text, to),
+          || format!("<{}>\n", to),
+          |text| format!("[{}]({})\n", text, to),
         )),
       Node::Heading {
         level,
         text,
       } => {
         markdown.push_str(&format!(
-          "{} {}",
+          "{} {}\n",
           match level {
             1 => "#",
             2 => "##",
@@ -50,20 +50,20 @@ pub fn convert(source: Vec<Node>) -> String {
         ));
       }
       Node::List(items) =>
-        markdown.push_str(
-          &items
+        markdown.push_str(&format!("{}\n",
+          items
             .into_iter()
             .map(|i| format!("- {}", i))
             .collect::<Vec<String>>()
-            .join("\n"),
+            .join("\n"),),
         ),
-      Node::Blockquote(text) => markdown.push_str(&format!("> {}", text)),
+      Node::Blockquote(text) => markdown.push_str(&format!("> {}\n", text)),
       Node::PreformattedText {
         alt_text,
         text,
       } => {
         markdown.push_str(&format!(
-          "```{}\n{}```",
+          "```{}\n{}```\n",
           alt_text.unwrap_or_else(|| "".to_string()),
           text
         ));
diff --git a/tests/convert.rs b/tests/convert.rs
new file mode 100644
index 0000000..5ad16ca
--- /dev/null
+++ b/tests/convert.rs
@@ -0,0 +1,70 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// 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, version 3.
+//
+// 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/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#[cfg(test)]
+mod test {
+  use germ::convert::{Target, from_string};
+
+  #[test]
+  fn convert_from_string_to_html_single_line() {
+    assert_eq!(
+      from_string("hi", &Target::HTML),
+      "<p>hi</p>",
+    );
+  }
+
+  #[test]
+  fn convert_from_string_to_html_multi_line() {
+    assert_eq!(
+      from_string("hi\n# hi", &Target::HTML),
+      "<p>hi</p><h1>hi</h1>",
+    );
+  }
+
+  #[test]
+  fn convert_from_string_to_html_single_link() {
+    assert_eq!(
+      from_string("=> /to hello !", &Target::HTML),
+      "<a href=\"/to\">hello !</a><br>",
+    );
+  }
+
+  #[test]
+  fn convert_from_string_to_markdown_single_line() {
+    assert_eq!(
+      from_string("hi", &Target::Markdown),
+      "hi\n",
+    );
+  }
+
+  #[test]
+  fn convert_from_string_to_markdown_multi_line() {
+    assert_eq!(
+      from_string("hi\n# hi", &Target::Markdown),
+      "hi\n# hi\n",
+    );
+  }
+
+  #[test]
+  fn convert_from_string_to_markdown_single_link() {
+    assert_eq!(
+      from_string("=> /to hello !", &Target::Markdown),
+      "[hello !](/to)\n",
+    );
+  }
+}