added test for helper function

src/test/builder/asciidoctor.rs

@@ -0,0 +1,19 @@
+use crate::app::builder::asciidoctor;
+
+#[test]
+fn last_matching_index_0() {
+    let vec1 = vec!["dings", "dings", "dingens"];
+    let vec2 = vec!["dings", "dings", "dings"];
+
+    let last_maching = asciidoctor::last_matching_index(&vec1, &vec2);
+    assert_eq!(last_maching, 1);
+}
+
+#[test]
+fn last_matching_index_1() {
+    let vec1 = vec!["dings", "dings", "dingens", "dings", "dingens"];
+    let vec2 = vec!["dings", "dings", "dingens", "dings"];
+
+    let last_maching = asciidoctor::last_matching_index(&vec1, &vec2);
+    assert_eq!(last_maching, 3);
+}

src/test/builder/mod.rs

@@ -0,0 +1 @@
+pub mod asciidoctor;