more platform stuff

cache/ttllru_test.go

@@ -0,0 +1,47 @@
+package cache
+
+import (
+	"testing"
+	"time"
+)
+
+func TestGetPut(t *testing.T) {
+	c := New[string, int](2, time.Minute)
+	if _, ok := c.Get("a"); ok {
+		t.Fatal("empty cache returned a hit")
+	}
+	c.Put("a", 1)
+	got, ok := c.Get("a")
+	if !ok || got != 1 {
+		t.Fatalf("get after put: ok=%v val=%v", ok, got)
+	}
+}
+
+func TestTTL(t *testing.T) {
+	c := New[string, int](8, 10*time.Millisecond)
+	c.Put("a", 1)
+	if _, ok := c.Get("a"); !ok {
+		t.Fatal("fresh entry missing")
+	}
+	time.Sleep(20 * time.Millisecond)
+	if _, ok := c.Get("a"); ok {
+		t.Fatal("expired entry still served")
+	}
+}
+
+func TestLRUEviction(t *testing.T) {
+	c := New[string, int](2, time.Minute)
+	c.Put("a", 1)
+	c.Put("b", 2)
+	_, _ = c.Get("a") // make "a" most-recently-used so "b" is the eviction victim
+	c.Put("c", 3)     // exceeds cap → evict LRU ("b")
+	if _, ok := c.Get("b"); ok {
+		t.Fatal("LRU victim 'b' not evicted")
+	}
+	if _, ok := c.Get("a"); !ok {
+		t.Fatal("recently-used 'a' was evicted")
+	}
+	if _, ok := c.Get("c"); !ok {
+		t.Fatal("freshly-put 'c' missing")
+	}
+}