diff --git a/Cargo.lock b/Cargo.lock
index 8a792f6..b38f3d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -674,6 +674,7 @@ dependencies = [
  "build_html",
  "bytes",
  "chrono",
+ "cool_asserts",
  "futures-util",
  "hex-string",
  "http",
diff --git a/file-service/Cargo.toml b/file-service/Cargo.toml
index 8452602..531ef4c 100644
--- a/file-service/Cargo.toml
+++ b/file-service/Cargo.toml
@@ -31,4 +31,5 @@ pretty_env_logger = { version = "0.5" }
 log         = { version = "0.4" }
 bytes       = { version = "1" }
 futures-util    = { version = "0.3" }
+cool_asserts = { version = "2" }