From 9e85474631a325bfe6d074f1b047c446babfc398 Mon Sep 17 00:00:00 2001
From: Brian Ginsburg <gins@brianginsburg.com>
Date: Mon, 27 Jan 2025 15:42:17 -0800
Subject: [PATCH] test: Add TestIsCheaperOrOlder unit test

---
 pkg/solver/matcher/matcher_test.go | 73 +++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/pkg/solver/matcher/matcher_test.go b/pkg/solver/matcher/matcher_test.go
index 52d22192..0ab12140 100644
--- a/pkg/solver/matcher/matcher_test.go
+++ b/pkg/solver/matcher/matcher_test.go
@@ -2,8 +2,11 @@
 
 package matcher
 
-import "testing"
+import (
+	"testing"
 
+	"github.com/lilypad-tech/lilypad/pkg/data"
+)
 
 func TestMatchOffers(t *testing.T) {
 	testCases := getMatchTestCases()
@@ -16,3 +19,71 @@ func TestMatchOffers(t *testing.T) {
 		})
 	}
 }
+
+func TestIsCheaperOrOlder(t *testing.T) {
+	testCases := []struct {
+		name     string
+		offerA   data.ResourceOffer
+		offerB   data.ResourceOffer
+		expected bool
+	}{
+		{
+			name: "cheaper wins",
+			offerA: data.ResourceOffer{
+				CreatedAt: 2,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 100,
+				},
+			},
+			offerB: data.ResourceOffer{
+				CreatedAt: 1,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 200,
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "older wins when same price",
+			offerA: data.ResourceOffer{
+				CreatedAt: 1,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 100,
+				},
+			},
+			offerB: data.ResourceOffer{
+				CreatedAt: 2,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 100,
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "more expensive loses regardless of age",
+			offerA: data.ResourceOffer{
+				CreatedAt: 1,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 200,
+				},
+			},
+			offerB: data.ResourceOffer{
+				CreatedAt: 2,
+				DefaultPricing: data.DealPricing{
+					InstructionPrice: 100,
+				},
+			},
+			expected: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := isCheaperOrOlder(tc.offerA, tc.offerB)
+			if result != tc.expected {
+				t.Errorf("isCheaperOrOlder(%+v, %+v) = %v, expected %v",
+					tc.offerA, tc.offerB, result, tc.expected)
+			}
+		})
+	}
+}