Add a test for the `AliasSearchError::NotFound` case

When the given alias being searched for does not appear in the alias
file, a `NotFound` error should be returned.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/tests.rs b/src/tests.rs
index a6f2777..0a512a1 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -55,3 +55,18 @@ fn find_alias_in_file_email_already_exists() {
         )
     );
 }
+
+#[test]
+fn find_alias_in_file_alias_is_new() {
+    assert_eq!(
+        Err(AliasSearchError::NotFound),
+        find_alias_in_file(
+            &Alias {
+                alias: "fry-philip".to_owned(),
+                name: "Philip Fry".to_owned(),
+                email: "<fry@planetexpress.com>".to_owned()
+            },
+            "./testdata/aliases"
+        )
+    );
+}