From ca1ac6bfd45942ae65350b6a3e485a72e7f2c59a Mon Sep 17 00:00:00 2001
From: Brad Stein <brad@bstein.dev>
Date: Wed, 5 Aug 2026 19:03:04 -0300
Subject: [PATCH] feat: pricing helper with regression tests

---
 Jenkinsfile            | 39 +++++++++++++++++++++++++++++++++++++++
 README.md              |  9 +++++++++
 pytest.ini             |  2 ++
 src/discount.py        | 13 +++++++++++++
 tests/test_discount.py | 26 ++++++++++++++++++++++++++
 5 files changed, 89 insertions(+)
 create mode 100644 Jenkinsfile
 create mode 100644 README.md
 create mode 100644 pytest.ini
 create mode 100644 src/discount.py
 create mode 100644 tests/test_discount.py

diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..274ea1c
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,39 @@
+// Test gate for the Hermes code-repair demo.
+podTemplate(cloud: 'kubernetes', yaml: """
+apiVersion: v1
+kind: Pod
+spec:
+  serviceAccountName: jenkins
+  securityContext:
+    runAsUser: 1000
+    runAsGroup: 1000
+    fsGroup: 1000
+    fsGroupChangePolicy: "OnRootMismatch"
+  nodeSelector:
+    kubernetes.io/arch: arm64
+    node-role.kubernetes.io/worker: "true"
+  containers:
+    - name: python
+      image: python:3.12-slim
+      command: ["sleep"]
+      args: ["3600"]
+      resources:
+        requests:
+          cpu: 100m
+          memory: 128Mi
+        limits:
+          cpu: 500m
+          memory: 512Mi
+""") {
+  node(POD_LABEL) {
+    container('python') {
+      stage('Checkout') {
+        checkout scm
+      }
+      stage('tests') {
+        sh 'pip install --quiet pytest'
+        sh 'python -m pytest -v --junitxml=build/junit.xml'
+      }
+    }
+  }
+}
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0224169
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# hermes-code-demo
+
+Deterministic source-defect fixture for the Hermes automated triage demo.
+
+`src/discount.py` holds one small pricing helper covered by `tests/test_discount.py`.
+The demo introduces a one-line defect on a branch, Jenkins fails the test gate,
+Ariadne collects the evidence, and Hermes proposes a minimal patch that Ariadne
+validates and pushes as a pull request for human review. Nothing merges
+automatically.
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..a635c5c
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,2 @@
+[pytest]
+pythonpath = .
diff --git a/src/discount.py b/src/discount.py
new file mode 100644
index 0000000..9ebbc19
--- /dev/null
+++ b/src/discount.py
@@ -0,0 +1,13 @@
+"""Order pricing helpers for the Hermes code-repair demo."""
+
+
+def apply_discount(subtotal: float, percent: float) -> float:
+    """Return the subtotal reduced by a whole-number discount percent.
+
+    Inputs: the order subtotal and a discount percent between 0 and 100.
+    Outputs: the discounted total, rounded to two decimal places.
+    """
+
+    if percent < 0 or percent > 100:
+        raise ValueError("percent must be between 0 and 100")
+    return round(subtotal * (1 - percent / 100), 2)
diff --git a/tests/test_discount.py b/tests/test_discount.py
new file mode 100644
index 0000000..9cf9971
--- /dev/null
+++ b/tests/test_discount.py
@@ -0,0 +1,26 @@
+"""Regression tests for the demo pricing helper."""
+
+import pytest
+
+from src.discount import apply_discount
+
+
+def test_no_discount_returns_subtotal() -> None:
+    assert apply_discount(100.0, 0) == 100.0
+
+
+def test_ten_percent_off() -> None:
+    assert apply_discount(100.0, 10) == 90.0
+
+
+def test_full_discount_is_free() -> None:
+    assert apply_discount(59.99, 100) == 0.0
+
+
+def test_fractional_rounding() -> None:
+    assert apply_discount(19.99, 15) == 16.99
+
+
+def test_rejects_out_of_range_percent() -> None:
+    with pytest.raises(ValueError):
+        apply_discount(10.0, 101)