Add better printing for ref test failure

The previous format was extremely difficult for a human to parse.

1 files changed, 17 insertions, 1 deletions

diff --git a/tests/ref.rs b/tests/ref.rs
index 98f1ed4a..7a78ec73 100644
--- a/tests/ref.rs
+++ b/tests/ref.rs
@@ -7,9 +7,11 @@ use std::path::Path;
 
 use alacritty::Grid;
 use alacritty::Term;
+use alacritty::ansi;
+use alacritty::index::{Line, Column};
 use alacritty::term::Cell;
 use alacritty::term::SizeInfo;
-use alacritty::ansi;
+use alacritty::util::fmt::{Red, Green};
 
 macro_rules! ref_tests {
     ($($name:ident)*) => {
@@ -71,5 +73,19 @@ fn ref_test(dir: &Path) {
         parser.advance(&mut terminal, byte, &mut io::sink());
     }
 
+    if grid != *terminal.grid() {
+        for (i, row) in terminal.grid().iter_rows().enumerate() {
+            for (j, cell) in row.iter().enumerate() {
+                let original_cell = &grid[Line(i)][Column(j)];
+                if *original_cell != *cell {
+                    println!("[{i}][{j}] {original:?} => {now:?}",
+                             i=i, j=j, original=Green(original_cell), now=Red(cell));
+                }
+            }
+        }
+
+        panic!("Ref test failed; grid doesn't match");
+    }
+
     assert_eq!(grid, *terminal.grid());
 }