From 1ae3896a21c4a62d095ae297e5260d95c5bf7a39 Mon Sep 17 00:00:00 2001
From: devwums <faladeomowumi81@gmail.com>
Date: Fri, 29 May 2026 21:52:38 +0100
Subject: [PATCH] feat(devkit): add shared test helpers module

---
 packages/devkit/src/lib.rs              |  2 ++
 packages/devkit/src/test_helpers/mod.rs | 31 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 packages/devkit/src/test_helpers/mod.rs

diff --git a/packages/devkit/src/lib.rs b/packages/devkit/src/lib.rs
index 7ea6e37..8ded65b 100644
--- a/packages/devkit/src/lib.rs
+++ b/packages/devkit/src/lib.rs
@@ -4,3 +4,5 @@ pub mod error;
 pub mod harness;
 pub mod simulation;
 pub mod types;
+#[cfg(test)]
+pub mod test_helpers;
diff --git a/packages/devkit/src/test_helpers/mod.rs b/packages/devkit/src/test_helpers/mod.rs
new file mode 100644
index 0000000..a0fbe40
--- /dev/null
+++ b/packages/devkit/src/test_helpers/mod.rs
@@ -0,0 +1,31 @@
+use crate::simulation::fee_model::{FeeModel, FeeModelConfig};
+use crate::types::FeeRecord;
+
+/// Returns a deterministic fee sequence of `count` records seeded by `seed`.
+pub fn make_fee_sequence(count: usize, seed: u64) -> Vec<FeeRecord> {
+    let config = FeeModelConfig {
+        seed: Some(seed),
+        ..Default::default()
+    };
+    FeeModel::new(config).generate(count, 0)
+}
+
+/// Returns a fee sequence where every record is flagged as a spike.
+pub fn make_spike_sequence(count: usize) -> Vec<FeeRecord> {
+    let config = FeeModelConfig {
+        spike_probability: 1.0,
+        seed: Some(0),
+        ..Default::default()
+    };
+    FeeModel::new(config).generate(count, 0)
+}
+
+/// Returns a fee sequence with no spikes (baseline load only).
+pub fn make_baseline_sequence(count: usize) -> Vec<FeeRecord> {
+    let config = FeeModelConfig {
+        spike_probability: 0.0,
+        seed: Some(1),
+        ..Default::default()
+    };
+    FeeModel::new(config).generate(count, 0)
+}