diff --git a/tests/all/utils.rs b/tests/all/utils.rs
deleted file mode 100644
index 8cf4191..0000000
--- a/tests/all/utils.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-use std::path::{Path, PathBuf};
-
-use copy_dir::copy_dir;
-use tempfile;
-
-/// Copy the given fixture into a unique temporary directory. This allows the
-/// test to mutate the copied fixture without messing up other tests that are
-/// also trying to read from or write to that fixture. The given path should be
-/// relative from the root of the repository, eg
-/// "tests/fixtures/im-from-brooklyn-the-place-where-stars-are-born".
-pub fn fixture<P>(fixture: P) -> Fixture
-where
-    P: AsRef<Path>,
-{
-    let fixture = fixture
-        .as_ref()
-        .canonicalize()
-        .expect("should canonicalize fixture path OK");
-    let dir = tempfile::tempdir().expect("should create temporary directory OK");
-    let path = dir.path().join("wasm-pack");
-    println!(
-        "wasm-pack: copying test fixture '{}' to temporary directory '{}'",
-        fixture.display(),
-        path.display()
-    );
-    copy_dir(fixture, &path).expect("should copy fixture directory into temporary directory OK");
-    Fixture { dir, path }
-}
-
-pub struct Fixture {
-    pub dir: tempfile::TempDir,
-    pub path: PathBuf,
-}
-
-pub mod manifest {
-    use std::fs::File;
-    use std::io::prelude::*;
-    use std::path::Path;
-
-    use failure::Error;
-    use serde_json;
-
-    #[derive(Deserialize)]
-    pub struct NpmPackage {
-        pub name: String,
-        pub description: String,
-        pub version: String,
-        pub license: String,
-        pub repository: Repository,
-        pub files: Vec<String>,
-        pub main: String,
-        pub types: Option<String>,
-    }
-
-    #[derive(Deserialize)]
-    pub struct Repository {
-        #[serde(rename = "type")]
-        pub ty: String,
-        pub url: String,
-    }
-
-    pub fn read_package_json(path: &Path) -> Result<NpmPackage, Error> {
-        let manifest_path = path.join("pkg").join("package.json");
-        let mut pkg_file = File::open(manifest_path)?;
-        let mut pkg_contents = String::new();
-        pkg_file.read_to_string(&mut pkg_contents)?;
-
-        Ok(serde_json::from_str(&pkg_contents)?)
-    }
-}
-
-pub mod readme {
-    use std::fs::File;
-    use std::io::Read;
-    use std::path::Path;
-
-    use failure::Error;
-
-    pub fn read_file(path: &Path) -> Result<String, Error> {
-        let mut file = File::open(path)?;
-        let mut contents = String::new();
-        file.read_to_string(&mut contents)?;
-
-        Ok(contents)
-    }
-}
diff --git a/tests/all/utils/manifest.rs b/tests/all/utils/manifest.rs
new file mode 100644
index 0000000..cc3d609
--- /dev/null
+++ b/tests/all/utils/manifest.rs
@@ -0,0 +1,34 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::Path;
+
+use failure::Error;
+use serde_json;
+
+#[derive(Deserialize)]
+pub struct NpmPackage {
+    pub name: String,
+    pub description: String,
+    pub version: String,
+    pub license: String,
+    pub repository: Repository,
+    pub files: Vec<String>,
+    pub main: String,
+    pub types: Option<String>,
+}
+
+#[derive(Deserialize)]
+pub struct Repository {
+    #[serde(rename = "type")]
+    pub ty: String,
+    pub url: String,
+}
+
+pub fn read_package_json(path: &Path) -> Result<NpmPackage, Error> {
+    let manifest_path = path.join("pkg").join("package.json");
+    let mut pkg_file = File::open(manifest_path)?;
+    let mut pkg_contents = String::new();
+    pkg_file.read_to_string(&mut pkg_contents)?;
+
+    Ok(serde_json::from_str(&pkg_contents)?)
+}
diff --git a/tests/all/utils/mod.rs b/tests/all/utils/mod.rs
new file mode 100644
index 0000000..d97bdcc
--- /dev/null
+++ b/tests/all/utils/mod.rs
@@ -0,0 +1,36 @@
+use std::path::{Path, PathBuf};
+
+use copy_dir::copy_dir;
+use tempfile;
+
+pub(crate) mod manifest;
+pub(crate) mod readme;
+
+pub struct Fixture {
+    pub dir: tempfile::TempDir,
+    pub path: PathBuf,
+}
+
+/// Copy the given fixture into a unique temporary directory. This allows the
+/// test to mutate the copied fixture without messing up other tests that are
+/// also trying to read from or write to that fixture. The given path should be
+/// relative from the root of the repository, eg
+/// "tests/fixtures/im-from-brooklyn-the-place-where-stars-are-born".
+pub fn fixture<P>(fixture: P) -> Fixture
+where
+    P: AsRef<Path>,
+{
+    let fixture = fixture
+        .as_ref()
+        .canonicalize()
+        .expect("should canonicalize fixture path OK");
+    let dir = tempfile::tempdir().expect("should create temporary directory OK");
+    let path = dir.path().join("wasm-pack");
+    println!(
+        "wasm-pack: copying test fixture '{}' to temporary directory '{}'",
+        fixture.display(),
+        path.display()
+    );
+    copy_dir(fixture, &path).expect("should copy fixture directory into temporary directory OK");
+    Fixture { dir, path }
+}
diff --git a/tests/all/utils/readme.rs b/tests/all/utils/readme.rs
new file mode 100644
index 0000000..cf7f23f
--- /dev/null
+++ b/tests/all/utils/readme.rs
@@ -0,0 +1,13 @@
+use std::fs::File;
+use std::io::Read;
+use std::path::Path;
+
+use failure::Error;
+
+pub fn read_file(path: &Path) -> Result<String, Error> {
+    let mut file = File::open(path)?;
+    let mut contents = String::new();
+    file.read_to_string(&mut contents)?;
+
+    Ok(contents)
+}