Add failing test for diff.mnemonicPrefix prefixes

https://git-scm.com/docs/git-config#Documentation/git-config.txt-diffmnemonicPrefix

1 files changed, 9 insertions, 8 deletions

diff --git a/src/parse.rs b/src/parse.rs
index e1a08601..5fba1d92 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -1,5 +1,8 @@
 use std::path::Path;
 
+// https://git-scm.com/docs/git-config#Documentation/git-config.txt-diffmnemonicPrefix
+const DIFF_PREFIXES: [&str; 6] = ["a", "b", "c", "i", "o", "w"];
+
 /// Given input like
 /// "--- one.rs	2019-11-20 06:16:08.000000000 +0100"
 /// Return "rs"
@@ -153,14 +156,12 @@ mod tests {
             get_file_path_from_file_meta_line("--- /dev/null", true),
             "/dev/null"
         );
-        assert_eq!(
-            get_file_path_from_file_meta_line("--- a/src/delta.rs", true),
-            "src/delta.rs"
-        );
-        assert_eq!(
-            get_file_path_from_file_meta_line("+++ b/src/delta.rs", true),
-            "src/delta.rs"
-        );
+        for prefix in &DIFF_PREFIXES {
+            assert_eq!(
+                get_file_path_from_file_meta_line(&format!("--- {}/src/delta.rs", prefix), true),
+                "src/delta.rs"
+            );
+        }
         assert_eq!(
             get_file_path_from_file_meta_line("--- src/delta.rs", true),
             "src/delta.rs"