test: add changelog generation tests

src/changelog.rs

@@ -59,9 +59,9 @@ impl ChangelogWriter {
     }
 
     fn replace(&mut self) -> Result<()> {
-        let mut content = Changelog::header();
+        let mut content = Changelog::default_header();
         content.push_str(&self.changelog.markdown(false));
-        content.push_str(Changelog::footer());
+        content.push_str(Changelog::default_footer());
 
         fs::write(&self.path, content).map_err(|err| anyhow!(err))
     }
@@ -102,7 +102,7 @@ impl Changelog {
         out
     }
 
-    fn header() -> String {
+    fn default_header() -> String {
         let title = "# Changelog";
         let link = "[conventional commits]";
         format!(
@@ -112,7 +112,85 @@ impl Changelog {
         )
     }
 
-    fn footer() -> &'static str {
+    fn default_footer() -> &'static str {
         "- - -\n\nThis changelog was generated by [cocogitto](https://github.com/oknozor/cocogitto)."
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::changelog::Changelog;
+    use crate::commit::{Commit, CommitMessage, CommitType};
+    use anyhow::Result;
+    use chrono::Utc;
+    use git2::Oid;
+
+    #[test]
+    fn should_generate_changelog() -> Result<()> {
+        // Arrange
+        let mut ch = Changelog {
+            from: Oid::from_str("5375e15770ddf8821d0c1ad393d315e243014c15")?,
+            to: Oid::from_str("35085f20c5293fc8830e4e44a9bb487f98734f73")?,
+            date: Utc::now().date().naive_local().to_string(),
+            commits: vec![
+                Commit {
+                    shorthand: "2134".to_string(),
+                    message: CommitMessage {
+                        commit_type: CommitType::Feature,
+                        scope: None,
+                        body: None,
+                        footer: None,
+                        description: "this is a commit message".to_string(),
+                        is_breaking_change: false,
+                    },
+                    author: "coco".to_string(),
+                    date: Utc::now().naive_local(),
+                },
+                Commit {
+                    shorthand: "4321".to_string(),
+                    message: CommitMessage {
+                        commit_type: CommitType::Feature,
+                        scope: None,
+                        body: None,
+                        footer: None,
+                        description: "this is an other commit message".to_string(),
+                        is_breaking_change: false,
+                    },
+                    author: "cogi".to_string(),
+                    date: Utc::now().naive_local(),
+                },
+            ],
+        };
+
+        // Act
+        let content = ch.markdown(false);
+
+        // Assert
+        assert!(content.contains("2134 - this is a commit message - coco"));
+        assert!(content.contains("4321 - this is an other commit message - cogi"));
+        assert!(content.contains("## 5375e1..35085f -"));
+        assert!(content.contains("### Features"));
+        assert!(!content.contains("### Tests"));
+        Ok(())
+    }
+
+    #[test]
+    fn should_generate_empty_changelog() -> Result<()> {
+        // Arrange
+        let mut ch = Changelog {
+            from: Oid::from_str("5375e15770ddf8821d0c1ad393d315e243014c15")?,
+            to: Oid::from_str("35085f20c5293fc8830e4e44a9bb487f98734f73")?,
+            date: Utc::now().date().naive_local().to_string(),
+            commits: vec![],
+        };
+
+        // Act
+        let content = ch.markdown(false);
+
+        // Assert
+        println!("{}", content);
+        assert!(content.contains("## 5375e1..35085f"));
+        assert!(!content.contains("### Features"));
+        Ok(())
+    }
+}