Define assert_diff_eq macro for context&unified diff comparison

Author: TanmayPatil105

Cargo.toml

@@ -17,7 +17,7 @@ path = "src/main.rs"
 [dependencies]
 chrono = "0.4.35"
 diff = "0.1.10"
-regex = "1.10.4"
+regex = "1.10.3"
 same-file = "1.0.6"
 unicode-width = "0.1.11"
 

src/context_diff.rs

@@ -726,9 +726,8 @@ mod tests {
 
     #[test]
     fn test_stop_early() {
-        use regex::Regex;
+        use crate::assert_diff_eq;
         use std::fs::File;
-        use std::str;
 
         let target = "target/context-diff";
         let _ = std::fs::create_dir(target);
@@ -749,10 +748,6 @@ mod tests {
             },
         );
 
-        let diff_full_text = str::from_utf8(&diff_full).unwrap();
-        let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+ [+-]\d{4}").unwrap();
-        let diff_full = re.replace_all(diff_full_text, "");
-
         let expected_full = [
             "*** target/context-diff/foo\t",
             "--- target/context-diff/bar\t",
@@ -768,7 +763,7 @@ mod tests {
             "",
         ]
         .join("\n");
-        assert_eq!(diff_full, expected_full);
+        assert_diff_eq!(diff_full, expected_full);
 
         let diff_brief = diff(
             from.as_bytes(),
@@ -781,16 +776,13 @@ mod tests {
             },
         );
 
-        let diff_brief_text = str::from_utf8(&diff_brief).unwrap();
-        let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+ [+-]\d{4}").unwrap();
-        let diff_brief = re.replace_all(diff_brief_text, "");
         let expected_brief = [
             "*** target/context-diff/foo\t",
             "--- target/context-diff/bar\t",
             "",
         ]
         .join("\n");
-        assert_eq!(diff_brief, expected_brief);
+        assert_diff_eq!(diff_brief, expected_brief);
 
         let nodiff_full = diff(
             from.as_bytes(),

src/lib.rs

@@ -1,5 +1,6 @@
 pub mod context_diff;
 pub mod ed_diff;
+pub mod macros;
 pub mod normal_diff;
 pub mod params;
 pub mod unified_diff;

src/macros.rs

@@ -0,0 +1,13 @@
+#[macro_export]
+macro_rules! assert_diff_eq {
+    ($actual:expr, $expected:expr) => {{
+        use regex::Regex;
+        use std::str;
+
+        let diff = str::from_utf8(&$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, "");
+
+        assert_eq!(actual, $expected);
+    }};
+}

src/main.rs

@@ -12,6 +12,7 @@ use std::process::{exit, ExitCode};
 
 mod context_diff;
 mod ed_diff;
+mod macros;
 mod normal_diff;
 mod params;
 mod unified_diff;

src/unified_diff.rs

@@ -880,9 +880,8 @@ mod tests {
 
     #[test]
     fn test_stop_early() {
-        use regex::Regex;
+        use crate::assert_diff_eq;
         use std::fs::File;
-        use std::str;
 
         let target = "target/context-diff";
         let _ = std::fs::create_dir(target);
@@ -903,10 +902,6 @@ mod tests {
             },
         );
 
-        let diff_full_text = str::from_utf8(&diff_full).unwrap();
-        let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+ [+-]\d{4}").unwrap();
-        let diff_full = re.replace_all(diff_full_text, "");
-
         let expected_full = [
             "--- target/context-diff/foo\t",
             "+++ target/context-diff/bar\t",
@@ -918,7 +913,7 @@ mod tests {
             "",
         ]
         .join("\n");
-        assert_eq!(diff_full, expected_full);
+        assert_diff_eq!(diff_full, expected_full);
 
         let diff_brief = diff(
             from.as_bytes(),
@@ -931,16 +926,13 @@ mod tests {
             },
         );
 
-        let diff_brief_text = str::from_utf8(&diff_brief).unwrap();
-        let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+ [+-]\d{4}").unwrap();
-        let diff_brief = re.replace_all(diff_brief_text, "");
         let expected_brief = [
             "--- target/context-diff/foo\t",
             "+++ target/context-diff/bar\t",
             "",
         ]
         .join("\n");
-        assert_eq!(diff_brief, expected_brief);
+        assert_diff_eq!(diff_brief, expected_brief);
 
         let nodiff_full = diff(
             from.as_bytes(),

tests/integration.rs

@@ -4,6 +4,7 @@
 // files that was distributed with this source code.
 
 use assert_cmd::cmd::Command;
+use diffutilslib::assert_diff_eq;
 use predicates::prelude::*;
 use std::io::Write;
 use tempfile::NamedTempFile;
@@ -173,26 +174,32 @@ fn read_from_stdin() -> Result<(), Box<dyn std::error::Error>> {
         .arg(file1.path())
         .arg("-")
         .write_stdin("bar\n");
-    cmd.assert()
-        .code(predicate::eq(1))
-        .failure()
-        .stdout(predicate::eq(format!(
+    cmd.assert().code(predicate::eq(1)).failure();
+
+    let output = cmd.output().unwrap().stdout;
+    assert_diff_eq!(
+        output,
+        format!(
             "--- {}\t\n+++ /dev/stdin\t\n@@ -1 +1 @@\n-foo\n+bar\n",
             file1.path().to_string_lossy()
-        )));
+        )
+    );
 
     let mut cmd = Command::cargo_bin("diffutils")?;
     cmd.arg("-u")
         .arg("-")
         .arg(file2.path())
         .write_stdin("foo\n");
-    cmd.assert()
-        .code(predicate::eq(1))
-        .failure()
-        .stdout(predicate::eq(format!(
+    cmd.assert().code(predicate::eq(1)).failure();
+
+    let output = cmd.output().unwrap().stdout;
+    assert_diff_eq!(
+        output,
+        format!(
             "--- /dev/stdin\t\n+++ {}\t\n@@ -1 +1 @@\n-foo\n+bar\n",
             file2.path().to_string_lossy()
-        )));
+        )
+    );
 
     let mut cmd = Command::cargo_bin("diffutils")?;
     cmd.arg("-u").arg("-").arg("-").write_stdin("foo\n");