Tests: Replace modification time in diff with "TIMESTAMP" placeholder

Author: TanmayPatil105

src/context_diff.rs

@@ -749,8 +749,8 @@ mod tests {
         );
 
         let expected_full = [
-            "*** target/context-diff/foo\t",
-            "--- target/context-diff/bar\t",
+            "*** target/context-diff/foo\tTIMESTAMP",
+            "--- target/context-diff/bar\tTIMESTAMP",
             "***************",
             "*** 1,3 ****",
             "  a",
@@ -777,8 +777,8 @@ mod tests {
         );
 
         let expected_brief = [
-            "*** target/context-diff/foo\t",
-            "--- target/context-diff/bar\t",
+            "*** target/context-diff/foo\tTIMESTAMP",
+            "--- target/context-diff/bar\tTIMESTAMP",
             "",
         ]
         .join("\n");

src/macros.rs

@@ -1,3 +1,15 @@
+// asserts equality of the actual diff and expected diff
+// considering datetime varitations
+//
+// It replaces the modification time in the actual diff
+// with placeholer "TIMESTAMP" and then asserts the equality
+//
+// For eg.
+// let brief = "*** fruits_old.txt\t2024-03-24 23:43:05.189597645 +0530\n
+//              --- fruits_new.txt\t2024-03-24 23:35:08.922581904 +0530\n";
+//
+// replaced = "*** fruits_old.txt\tTIMESTAMP\n
+//             --- fruits_new.txt\tTIMESTAMP\n";
 #[macro_export]
 macro_rules! assert_diff_eq {
     ($actual:expr, $expected:expr) => {{
@@ -6,7 +18,7 @@ macro_rules! assert_diff_eq {
 
         let diff = str::from_utf8(&$actual).unwrap();
         let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+ [+-]\d{4}").unwrap();
-        let actual = re.replace_all(diff, "");
+        let actual = re.replace_all(diff, "TIMESTAMP");
 
         assert_eq!(actual, $expected);
     }};

src/unified_diff.rs

@@ -903,8 +903,8 @@ mod tests {
         );
 
         let expected_full = [
-            "--- target/context-diff/foo\t",
-            "+++ target/context-diff/bar\t",
+            "--- target/context-diff/foo\tTIMESTAMP",
+            "+++ target/context-diff/bar\tTIMESTAMP",
             "@@ -1,3 +1,3 @@",
             " a",
             "-b",
@@ -927,8 +927,8 @@ mod tests {
         );
 
         let expected_brief = [
-            "--- target/context-diff/foo\t",
-            "+++ target/context-diff/bar\t",
+            "--- target/context-diff/foo\tTIMESTAMP",
+            "+++ target/context-diff/bar\tTIMESTAMP",
             "",
         ]
         .join("\n");

tests/integration.rs

@@ -185,7 +185,7 @@ fn read_from_stdin() -> Result<(), Box<dyn std::error::Error>> {
     assert_diff_eq!(
         output,
         format!(
-            "--- {}\t\n+++ -\t\n@@ -1 +1 @@\n-foo\n+bar\n",
+            "--- {}\tTIMESTAMP\n+++ -\tTIMESTAMP\n@@ -1 +1 @@\n-foo\n+bar\n",
             file1.path().to_string_lossy()
         )
     );
@@ -201,7 +201,7 @@ fn read_from_stdin() -> Result<(), Box<dyn std::error::Error>> {
     assert_diff_eq!(
         output,
         format!(
-            "--- -\t\n+++ {}\t\n@@ -1 +1 @@\n-foo\n+bar\n",
+            "--- -\tTIMESTAMP\n+++ {}\tTIMESTAMP\n@@ -1 +1 @@\n-foo\n+bar\n",
             file2.path().to_string_lossy()
         )
     );
@@ -226,7 +226,7 @@ fn read_from_stdin() -> Result<(), Box<dyn std::error::Error>> {
         assert_diff_eq!(
             output,
             format!(
-                "--- {}\t\n+++ /dev/stdin\t\n@@ -1 +1 @@\n-foo\n+bar\n",
+                "--- {}\tTIMESTAMP\n+++ /dev/stdin\tTIMESTAMP\n@@ -1 +1 @@\n-foo\n+bar\n",
                 file1.path().to_string_lossy()
             )
         );