add `cache` package

A simple key-value store.

1 files changed, 72 insertions, 0 deletions

diff --git a/cache/cache_test.go b/cache/cache_test.go
new file mode 100644
index 0000000..41e0d25
--- /dev/null
+++ b/cache/cache_test.go
@@ -0,0 +1,72 @@
+// Copyright © 2022 siddharth ravikumar <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package cache
+
+import (
+	"testing"
+	"time"
+)
+
+func TestNewCache(t *testing.T) {
+	c := NewCache()
+	if c == nil {
+		t.Errorf("cache is nil")
+		return
+	}
+	if c.store == nil {
+		t.Errorf("cache.store is nil")
+		return
+	}
+	// Try manually adding an item.
+	c.store["foo"] = item{
+		value:   "bar",
+		expires: time.Now().Add(time.Second * 10),
+	}
+	if c.store["foo"].value != "bar" {
+		t.Errorf("cache.store['foo'] is not bar")
+		return
+	}
+}
+
+func TestCacheSet(t *testing.T) {
+	c := NewCache()
+	if c == nil {
+		t.Errorf("cache is nil")
+		return
+	}
+	exp := time.Now().Add(time.Second * 10)
+	c.Set("foo", "bar", exp)
+	if c.store["foo"].value != "bar" {
+		t.Errorf("cache.store['foo'] is not bar")
+		return
+	}
+	if c.store["foo"].expires.Unix() != exp.Unix() {
+		t.Errorf("cache.store['foo'].expires no set correctly")
+		return
+	}
+}
+
+func TestCacheGet(t *testing.T) {
+	c := NewCache()
+	if c == nil {
+		t.Errorf("cache is nil")
+		return
+	}
+
+	// Test 1
+	exp := time.Now().Add(time.Second * 10)
+	c.Set("foo", "bar", exp)
+	if c.Get("foo") != "bar" {
+		t.Errorf("cache.Get(foo) is not bar")
+		return
+	}
+
+	// Test 2
+	exp = time.Now().Add(time.Second * -10)
+	c.Set("sna", "fu", exp)
+	if c.Get("sna") != "" {
+		t.Errorf("cache.Get(sna) is not empty: %s", c.Get("sna"))
+		return
+	}
+}