diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ef70dd..0eaa237 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
         run: just rustdoc
       - name: Check for differences
         run: git diff --exit-code
-    
+
   build-and-test:
     name: Build and test
     runs-on: ${{ matrix.os }}
@@ -45,11 +45,11 @@ jobs:
     env:
       RUSTFLAGS: -D warnings
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      # The e2e-example tests require origin/main to be present.
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
-          ref: main
+          # We need to fetch the entire history so the tests can run merge-base
+          # operations.
+          fetch-depth: 0
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust-version }}
diff --git a/crates/integration-tests/src/common/mod.rs b/crates/integration-tests/src/common/mod.rs
index f23d19b..7c8a2a1 100644
--- a/crates/integration-tests/src/common/mod.rs
+++ b/crates/integration-tests/src/common/mod.rs
@@ -53,9 +53,14 @@ impl TestEnvironment {
             &["config", "user.email", "test@example.com"],
         )?;
 
-        // Create initial commit to establish git history.
+        // Create initial commit to establish git history, including disabling
+        // Windows line endings.
+        workspace_root.child(".gitattributes").write_str("* -text\n")?;
         workspace_root.child("README.md").write_str("# Test workspace\n")?;
-        Self::run_git_command(&workspace_root, &["add", "README.md"])?;
+        Self::run_git_command(
+            &workspace_root,
+            &["add", ".gitattributes", "README.md"],
+        )?;
         Self::run_git_command(
             &workspace_root,
             &["commit", "-m", "initial commit"],
@@ -126,14 +131,16 @@ impl TestEnvironment {
         api_ident: &str,
         version: &str,
     ) -> bool {
-        // Versioned documents are stored in subdirectories like: documents/api/api-version-hash.json
+        // Versioned documents are stored in subdirectories like:
+        // documents/api/api-version-hash.json.
         let pattern =
             format!("documents/{}/{}-{}-", api_ident, api_ident, version);
-        if let Ok(files) = self.list_document_files() {
-            files.iter().any(|f| f.to_string().starts_with(&pattern))
-        } else {
-            false
-        }
+        let files = self
+            .list_document_files()
+            .expect("reading document files succeeded");
+        files
+            .iter()
+            .any(|f| rel_path_forward_slashes(f.as_ref()).starts_with(&pattern))
     }
 
     /// Read the content of a versioned API document for a specific version.
@@ -149,7 +156,9 @@ impl TestEnvironment {
 
         let matching_file = files
             .iter()
-            .find(|f| f.to_string().starts_with(&pattern))
+            .find(|f| {
+                rel_path_forward_slashes(f.as_ref()).starts_with(&pattern)
+            })
             .ok_or_else(|| {
                 anyhow!(
                     "No versioned document found for {} version {}",
@@ -171,7 +180,9 @@ impl TestEnvironment {
 
         Ok(files
             .into_iter()
-            .filter(|f| f.to_string().starts_with(&prefix))
+            .filter(|f| {
+                rel_path_forward_slashes(f.as_ref()).starts_with(&prefix)
+            })
             .collect())
     }
 
@@ -307,6 +318,16 @@ impl TestEnvironment {
     }
 }
 
+#[cfg(windows)]
+pub fn rel_path_forward_slashes(path: &str) -> String {
+    path.replace('\\', "/")
+}
+
+#[cfg(not(windows))]
+pub fn rel_path_forward_slashes(path: &str) -> String {
+    path.to_string()
+}
+
 /// Create a versioned health API test configuration.
 pub fn versioned_health_test_api() -> ManagedApiConfig {
     ManagedApiConfig {
diff --git a/crates/integration-tests/tests/integration/versioned.rs b/crates/integration-tests/tests/integration/versioned.rs
index d682941..4a0475f 100644
--- a/crates/integration-tests/tests/integration/versioned.rs
+++ b/crates/integration-tests/tests/integration/versioned.rs
@@ -177,7 +177,7 @@ fn test_mixed_lockstep_and_versioned_apis() -> Result<()> {
     let lockstep_files: Vec<_> = all_files
         .iter()
         .filter(|f| {
-            let path_str = f.to_string();
+            let path_str = rel_path_forward_slashes(f.as_ref());
             f.extension() == Some("json")
                 && path_str.starts_with("documents/")
                 && !path_str[10..].contains('/') // No subdirectories after "documents/"
@@ -186,7 +186,7 @@ fn test_mixed_lockstep_and_versioned_apis() -> Result<()> {
     let versioned_files: Vec<_> = all_files
         .iter()
         .filter(|f| {
-            let path_str = f.to_string();
+            let path_str = rel_path_forward_slashes(f.as_ref());
             path_str.starts_with("documents/") && path_str[10..].contains('/') // Has subdirectories
         })
         .collect();
@@ -195,7 +195,7 @@ fn test_mixed_lockstep_and_versioned_apis() -> Result<()> {
     assert_eq!(lockstep_files.len(), 2);
 
     // Should have versioned files (each API has 4 files: 3 versions + latest).
-    assert!(versioned_files.len() >= 8);
+    assert_eq!(versioned_files.len(), 8);
 
     Ok(())
 }