tests: replace test env path in output by $TEST_ENV

Mercurial's test runner does something like this.

I considered replacing `\` by `/` everywhere, but we use `\` in
graph-log output quite frequently, so it doesn't seem worth it.

tests/common/mod.rs

@@ -17,6 +17,7 @@ use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 
 use jujutsu_lib::testutils;
+use regex::{Captures, Regex};
 use tempfile::TempDir;
 
 pub struct TestEnvironment {
@@ -77,14 +78,14 @@ impl TestEnvironment {
     /// Run a `jj` command, check that it was successful, and return its stdout
     pub fn jj_cmd_success(&self, current_dir: &Path, args: &[&str]) -> String {
         let assert = self.jj_cmd(current_dir, args).assert().success().stderr("");
-        get_stdout_string(&assert)
+        self.normalize_output(get_stdout_string(&assert))
     }
 
     /// Run a `jj` command, check that it failed with code 1, and return its
     /// stderr
     pub fn jj_cmd_failure(&self, current_dir: &Path, args: &[&str]) -> String {
         let assert = self.jj_cmd(current_dir, args).assert().code(1).stdout("");
-        get_stderr_string(&assert)
+        self.normalize_output(get_stderr_string(&assert))
     }
 
     /// Run a `jj` command and check that it failed with code 2 (for invalid
@@ -154,6 +155,19 @@ impl TestEnvironment {
         self.add_env_var("DIFF_EDIT_SCRIPT", edit_script.to_str().unwrap());
         edit_script
     }
+
+    pub fn normalize_output(&self, text: String) -> String {
+        let regex = Regex::new(&format!(
+            r"{}(\S+)",
+            regex::escape(&self.env_root.display().to_string())
+        ))
+        .unwrap();
+        regex
+            .replace_all(&text, |caps: &Captures| {
+                format!("$TEST_ENV{}", caps[1].replace('\\', "/"))
+            })
+            .to_string()
+    }
 }
 
 pub fn get_stdout_string(assert: &assert_cmd::assert::Assert) -> String {

tests/test_git_clone.rs

@@ -24,8 +24,8 @@ fn test_git_clone() {
 
     // Clone an empty repo
     let stdout = test_env.jj_cmd_success(test_env.env_root(), &["git", "clone", "source", "empty"]);
-    insta::assert_snapshot!(stdout.replace(test_env.env_root().join("empty").to_str().unwrap(), "<dest>"), @r###"
-    Fetching into new repo in "<dest>"
+    insta::assert_snapshot!(stdout, @r###"
+    Fetching into new repo in "$TEST_ENV/empty"
     Nothing changed.
     "###);
 
@@ -51,8 +51,8 @@ fn test_git_clone() {
         .unwrap();
     git_repo.set_head("refs/heads/main").unwrap();
     let stdout = test_env.jj_cmd_success(test_env.env_root(), &["git", "clone", "source", "clone"]);
-    insta::assert_snapshot!(stdout.replace(test_env.env_root().join("clone").to_str().unwrap(), "<dest>"), @r###"
-    Fetching into new repo in "<dest>"
+    insta::assert_snapshot!(stdout, @r###"
+    Fetching into new repo in "$TEST_ENV/clone"
     Working copy now at: 1f0b881a057d (no description set)
     Added 1 files, modified 0 files, removed 0 files
     "###);
@@ -60,21 +60,21 @@ fn test_git_clone() {
 
     // Try cloning into an existing workspace
     let stderr = test_env.jj_cmd_failure(test_env.env_root(), &["git", "clone", "source", "clone"]);
-    insta::assert_snapshot!(stderr.replace(test_env.env_root().join("clone").to_str().unwrap(), "<dest>"), @r###"
+    insta::assert_snapshot!(stderr, @r###"
     Error: Destination path exists and is not an empty directory
     "###);
 
     // Try cloning into an existing file
     std::fs::write(test_env.env_root().join("file"), "contents").unwrap();
     let stderr = test_env.jj_cmd_failure(test_env.env_root(), &["git", "clone", "source", "file"]);
-    insta::assert_snapshot!(stderr.replace(test_env.env_root().join("file").to_str().unwrap(), "<dest>"), @r###"
+    insta::assert_snapshot!(stderr, @r###"
     Error: Destination path exists and is not an empty directory
     "###);
 
     // Try cloning into non-empty, non-workspace directory
     std::fs::remove_dir_all(test_env.env_root().join("clone").join(".jj")).unwrap();
     let stderr = test_env.jj_cmd_failure(test_env.env_root(), &["git", "clone", "source", "clone"]);
-    insta::assert_snapshot!(stderr.replace(test_env.env_root().join("clone").to_str().unwrap(), "<dest>"), @r###"
+    insta::assert_snapshot!(stderr, @r###"
     Error: Destination path exists and is not an empty directory
     "###);
 }