chore(tests): test log with only_first_parent

tests/lib_tests/log.rs

@@ -4,6 +4,7 @@ use cocogitto::CocoGitto;
 use crate::helpers::*;
 
 use anyhow::Result;
+use cmd_lib::run_cmd;
 use sealed_test::prelude::*;
 use speculoos::prelude::*;
 
@@ -48,3 +49,31 @@ fn get_log_with_no_errors() -> Result<()> {
 
     Ok(())
 }
+
+#[sealed_test]
+fn get_log_on_master_only() -> Result<()> {
+    // Arrange
+    git_init()?;
+    let settings = r#"only_first_parent = true"#;
+    run_cmd!(echo $settings > cog.toml;)?;
+    git_commit("chore: initial commit")?;
+
+    run_cmd!(git checkout -b feature)?;
+    git_commit("feat: a commit on feature branch")?;
+    git_commit("fix: a commit on feature branch")?;
+    run_cmd!(
+        git checkout master;
+        git merge --no-ff -m "feat: feature" feature;
+    )?;
+
+    let filters = CommitFilters(vec![CommitFilter::NoError]);
+    let cocogitto = CocoGitto::get()?;
+
+    // Act
+    let logs = cocogitto.get_log(filters)?;
+
+    // Assert we don't see feature branch commit
+    assert_that!(logs).does_not_contain("a commit on feature branch");
+
+    Ok(())
+}