diff --git a/src/lockfile.rs b/src/lockfile.rs
index 6297bb4..19571b8 100644
--- a/src/lockfile.rs
+++ b/src/lockfile.rs
@@ -8,7 +8,7 @@ use strum::IntoEnumIterator;
 
 use crate::{core::PackageManagerKind, errors::Error};
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub struct Lockfile {
   pub kind: PackageManagerKind,
   path: PathBuf,
@@ -43,3 +43,97 @@ impl Lockfile {
     Ok(hash)
   }
 }
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use crate::{core::PackageManagerKind, test_each, utils::path::to_absolute_path};
+
+  struct NewTestCase {
+    input: &'static str,
+    expected: (PackageManagerKind, PathBuf),
+  }
+
+  fn test_new_each(case: NewTestCase) {
+    let lockfile = Lockfile::new(case.input).unwrap();
+    assert_eq!(lockfile.kind, case.expected.0);
+    assert_eq!(lockfile.path, case.expected.1);
+  }
+
+  test_each!(
+    test_new,
+    "npm" => NewTestCase {
+      input: "./tests/fixtures/lockfile/npm",
+      expected: (
+        PackageManagerKind::Npm,
+        PathBuf::from("./tests/fixtures/lockfile/npm/package-lock.json")
+      ),
+    },
+    "yarn" => NewTestCase {
+      input: "./tests/fixtures/lockfile/yarn",
+      expected: (
+        PackageManagerKind::Yarn,
+        PathBuf::from("./tests/fixtures/lockfile/yarn/yarn.lock")
+      ),
+    },
+    "pnpm" => NewTestCase {
+      input: "./tests/fixtures/lockfile/pnpm",
+      expected: (
+        PackageManagerKind::Pnpm,
+        PathBuf::from("./tests/fixtures/lockfile/pnpm/pnpm-lock.yaml")
+      ),
+    },
+    "bun" => NewTestCase {
+      input: "./tests/fixtures/lockfile/bun",
+      expected: (
+        PackageManagerKind::Bun,
+        PathBuf::from("./tests/fixtures/lockfile/bun/bun.lockb")
+      ),
+    },
+  );
+
+  #[test]
+  fn test_new_nope() {
+    let lockfile = Lockfile::new("tests/fixtures/lockfile/nope");
+    assert_eq!(
+      lockfile.unwrap_err().to_string(),
+      format!(
+        "No lockfile at: `{}`",
+        to_absolute_path("tests/fixtures/lockfile/nope")
+          .unwrap()
+          .to_string_lossy()
+      )
+    );
+  }
+
+  struct GenerateHashTestCase {
+    input: &'static str,
+    expected: &'static str,
+  }
+
+  fn test_generate_hash_each(case: GenerateHashTestCase) {
+    let lockfile = Lockfile::new(case.input).unwrap();
+    let hash = lockfile.generate_hash().unwrap();
+    assert_eq!(hash, case.expected);
+  }
+
+  test_each!(
+    test_generate_hash,
+    "npm" => GenerateHashTestCase {
+      input: "./tests/fixtures/lockfile/npm",
+      expected: "5hzH5KU3P+PfcvEwLVd5mIJrFInY5SfHCCeoPCspqUs=",
+    },
+    "yarn" => GenerateHashTestCase {
+      input: "./tests/fixtures/lockfile/yarn",
+      expected: "dmy8HKrg+5lrLw8qnSanCzazm+5zgxA6la9Z2zh7GJ0=",
+    },
+    "pnpm" => GenerateHashTestCase {
+      input: "./tests/fixtures/lockfile/pnpm",
+      expected: "3cxQHKge5hfKnZimYZiyfzdlbYSyanBOd8ImNQK7HCM=",
+    },
+    "bun" => GenerateHashTestCase {
+      input: "./tests/fixtures/lockfile/bun",
+      expected: "hQM/8tFjhA/WkaV3dpQAEvNWVsyou1GpqyhIxwfKiTA=",
+    },
+  );
+}
diff --git a/src/utils/glob.rs b/src/utils/glob.rs
index 68b6016..0185f8b 100644
--- a/src/utils/glob.rs
+++ b/src/utils/glob.rs
@@ -93,7 +93,7 @@ fn parse_negate(pattern: String, enable_negate: bool) -> (String, bool) {
 
 #[cfg(test)]
 mod tests {
-  use crate::test_each;
+  use crate::{test_each, test_each_serial};
 
   use super::*;
   use std::fs::File;
@@ -137,7 +137,7 @@ mod tests {
     tmp_dir.close().unwrap();
   }
 
-  test_each! {
+  test_each_serial! {
     test_collect,
     0 => &CollectTestCase {
       input: (vec!["foo"], true),
diff --git a/src/utils/tests.rs b/src/utils/tests.rs
index b590406..55d745a 100644
--- a/src/utils/tests.rs
+++ b/src/utils/tests.rs
@@ -1,6 +1,20 @@
 mod tests {
   #[macro_export]
   macro_rules! test_each {
+    ($name:ident, $($suffix:expr => $case:expr,)*) => {
+      paste::item! {
+        $(
+          #[test]
+          fn [< $name _ $suffix >]() {
+            [< $name _each >]($case);
+          }
+        )*
+      }
+    };
+  }
+
+  #[macro_export]
+  macro_rules! test_each_serial {
     ($name:ident, $($suffix:expr => $case:expr,)*) => {
       paste::item! {
         $(
diff --git a/tests/fixtures/lockfile/bun/bun.lockb b/tests/fixtures/lockfile/bun/bun.lockb
new file mode 100755
index 0000000..da2a398
Binary files /dev/null and b/tests/fixtures/lockfile/bun/bun.lockb differ
diff --git a/tests/fixtures/lockfile/bun/package.json b/tests/fixtures/lockfile/bun/package.json
new file mode 100644
index 0000000..7c88992
--- /dev/null
+++ b/tests/fixtures/lockfile/bun/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/tests/fixtures/lockfile/nope/.gitkeep b/tests/fixtures/lockfile/nope/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/fixtures/lockfile/npm/package-lock.json b/tests/fixtures/lockfile/npm/package-lock.json
new file mode 100644
index 0000000..4bd1921
--- /dev/null
+++ b/tests/fixtures/lockfile/npm/package-lock.json
@@ -0,0 +1,24 @@
+{
+  "name": "npm",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "typescript": "^5.3.3"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.3.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.3.3.tgz",
+      "integrity": "sha512-pXWcraxM0uxAS+tN0AG/BF2TyqmHO014Z070UsJ+pFvYuRSq8KH8DmWpnbXe0pEPDHXZV3FcAbJkijJ5oNEnWw==",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  }
+}
diff --git a/tests/fixtures/lockfile/npm/package.json b/tests/fixtures/lockfile/npm/package.json
new file mode 100644
index 0000000..7c88992
--- /dev/null
+++ b/tests/fixtures/lockfile/npm/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/tests/fixtures/lockfile/pnpm/package.json b/tests/fixtures/lockfile/pnpm/package.json
new file mode 100644
index 0000000..7c88992
--- /dev/null
+++ b/tests/fixtures/lockfile/pnpm/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/tests/fixtures/lockfile/pnpm/pnpm-lock.yaml b/tests/fixtures/lockfile/pnpm/pnpm-lock.yaml
new file mode 100644
index 0000000..6813016
--- /dev/null
+++ b/tests/fixtures/lockfile/pnpm/pnpm-lock.yaml
@@ -0,0 +1,18 @@
+lockfileVersion: '6.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+dependencies:
+  typescript:
+    specifier: ^5.3.3
+    version: 5.3.3
+
+packages:
+
+  /typescript@5.3.3:
+    resolution: {integrity: sha512-pXWcraxM0uxAS+tN0AG/BF2TyqmHO014Z070UsJ+pFvYuRSq8KH8DmWpnbXe0pEPDHXZV3FcAbJkijJ5oNEnWw==}
+    engines: {node: '>=14.17'}
+    hasBin: true
+    dev: false
diff --git a/tests/fixtures/lockfile/yarn/package.json b/tests/fixtures/lockfile/yarn/package.json
new file mode 100644
index 0000000..7c88992
--- /dev/null
+++ b/tests/fixtures/lockfile/yarn/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/tests/fixtures/lockfile/yarn/yarn.lock b/tests/fixtures/lockfile/yarn/yarn.lock
new file mode 100644
index 0000000..cd07bce
--- /dev/null
+++ b/tests/fixtures/lockfile/yarn/yarn.lock
@@ -0,0 +1,8 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+typescript@^5.3.3:
+  version "5.3.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.3.3.tgz#b3ce6ba258e72e6305ba66f5c9b452aaee3ffe37"
+  integrity sha512-pXWcraxM0uxAS+tN0AG/BF2TyqmHO014Z070UsJ+pFvYuRSq8KH8DmWpnbXe0pEPDHXZV3FcAbJkijJ5oNEnWw==