Filter total # of checks and filenames in snapshots

Cargo.toml

@@ -52,6 +52,7 @@ similar-asserts = { version = "1.5.0", features = ["serde"] }
 predicates = "3.1.0"
 insta = { version = "1.39.0", features = ["ron", "filters"] }
 fs-err = "2.11.0"
+regex = "1.10.6"
 
 # In dev and test profiles, compile all dependencies with optimizations enabled,
 # but still checking debug assertions and overflows.

src/snapshot_tests.rs

@@ -44,6 +44,7 @@ use std::{
     cell::RefCell,
     fmt,
     io::{Cursor, Write},
+    path::{Path, PathBuf},
     rc::Rc,
 };
 
@@ -151,6 +152,14 @@ fn assert_integration_test(test_name: &str, invocation: &[&str]) {
     settings.set_snapshot_path("../test_outputs/snapshot_tests");
     // Turn dynamic time strings like [  0.123s] into [TIME] for reproducibility.
     settings.add_filter(r"\[\s*[\d\.]+s\]", "[TIME]");
+    // Turn total number of checks into [TOTAL] to not fail when new lints are added.
+    settings.add_filter(r"\d+ checks", "[TOTAL] checks");
+    // Similarly, turn the number of passed checks to also not fail when new lints are added.
+    settings.add_filter(r"\d+ pass", "[PASS] pass");
+    // Escape the root path (e.g., in lint spans) for deterministic results in different
+    // build environments.
+    let repo_root = get_root_path();
+    settings.add_filter(&regex::escape(&repo_root.to_string_lossy()), "[ROOT]");
 
     // The `settings` are applied to the current thread as long as the returned
     // drop guard  `_grd` is alive, so we use a `let` binding to keep it alive
@@ -180,6 +189,21 @@ fn assert_integration_test(test_name: &str, invocation: &[&str]) {
     insta::assert_snapshot!(format!("{test_name}-output"), result);
 }
 
+/// Helper function to get the root of the source code repository, for
+/// filtering the path in snapshots.
+fn get_root_path() -> PathBuf {
+    let canonicalized = Path::new(file!())
+        .canonicalize()
+        .expect("canonicalization failed");
+    // this file is in `$ROOT/src/snapshot_tests.rs`, so the repo root is two `parent`s up.
+    let repo_root = canonicalized
+        .parent()
+        .and_then(Path::parent)
+        .expect("getting repo root failed");
+
+    repo_root.to_owned()
+}
+
 /// [#163](/~https://github.com/obi1kenobi/cargo-semver-checks/issues/163)
 ///
 /// Running `cargo semver-checks --workspace` on a workspace that doesn't