diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 9171369ae2..01eb5808d7 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -626,6 +626,7 @@ name = "codex-cli"
 version = "0.0.0"
 dependencies = [
  "anyhow",
+ "assert_cmd",
  "clap",
  "clap_complete",
  "codex-chatgpt",
@@ -637,9 +638,13 @@ dependencies = [
  "codex-mcp-server",
  "codex-tui",
  "serde_json",
+ "tempfile",
  "tokio",
  "tracing",
  "tracing-subscriber",
+ "uuid",
+ "walkdir",
+ "wiremock",
 ]
 
 [[package]]
diff --git a/codex-rs/cli/Cargo.toml b/codex-rs/cli/Cargo.toml
index 943788157b..6f011e3023 100644
--- a/codex-rs/cli/Cargo.toml
+++ b/codex-rs/cli/Cargo.toml
@@ -36,3 +36,10 @@ tokio = { version = "1", features = [
 ] }
 tracing = "0.1.41"
 tracing-subscriber = "0.3.19"
+
+[dev-dependencies]
+assert_cmd = "2"
+tempfile = "3"
+uuid = { version = "1", features = ["serde", "v4"] }
+walkdir = "2.5.0"
+wiremock = "0.6"
diff --git a/codex-rs/core/tests/cli_responses_fixture.sse b/codex-rs/core/tests/cli_responses_fixture.sse
deleted file mode 100644
index d297ebafb2..0000000000
--- a/codex-rs/core/tests/cli_responses_fixture.sse
+++ /dev/null
@@ -1,8 +0,0 @@
-event: response.created
-data: {"type":"response.created","response":{"id":"resp1"}}
-
-event: response.output_item.done
-data: {"type":"response.output_item.done","item":{"type":"message","role":"assistant","content":[{"type":"output_text","text":"fixture hello"}]}}
-
-event: response.completed
-data: {"type":"response.completed","response":{"id":"resp1","output":[]}}