diff --git a/test/cache.test.js b/test/cache.test.js
new file mode 100644
index 0000000..7ba2c96
--- /dev/null
+++ b/test/cache.test.js
@@ -0,0 +1,307 @@
+// Import Node.js Dependencies
+import assert from "node:assert/strict";
+import { before, describe, it } from "node:test";
+import fs from "node:fs";
+import path from "node:path";
+import os from "node:os";
+
+// Import Third-party Dependencies
+import cacache from "cacache";
+
+// Import Internal Dependencies
+import { appCache } from "../src/http-server/cache.js";
+
+// CONSTANTS
+const kPayloadsPath = path.join(os.homedir(), ".nsecure", "payloads");
+
+describe("appCache", () => {
+  before(() => {
+    appCache.prefix = "test_runner";
+  });
+
+  it("should update and get config", async() => {
+    await appCache.updateConfig({ foo: "bar" });
+
+    const updated = await appCache.getConfig();
+    assert.deepEqual(updated, { foo: "bar" });
+  });
+
+  it("should write payload into ~/.nsecure/payloads", (t) => {
+    let writePath;
+    let writeValue;
+    t.mock.method(fs, "writeFileSync", (path, value) => {
+      writePath = path;
+      writeValue = value;
+    });
+
+    appCache.updatePayload("foo/bar", { foo: "bar" });
+
+    assert.equal(writePath, path.join(kPayloadsPath, "foo-bar"));
+    assert.equal(writeValue, JSON.stringify({ foo: "bar" }));
+  });
+
+  it("getPayload should return the payload", async(t) => {
+    t.mock.method(fs, "readFileSync", () => JSON.stringify({ foo: "bar" }));
+
+    const payload = await appCache.getPayload("foo/bar");
+
+    assert.deepEqual(payload, { foo: "bar" });
+  });
+
+  it("getPayload should throw", async(t) => {
+    t.mock.method(fs, "readFileSync", () => {
+      throw new Error("boo");
+    });
+
+    await assert.rejects(async() => appCache.getPayload("foo/bar"), {
+      message: "boo"
+    });
+  });
+
+  it("getPayloadOrNull should return payload", async(t) => {
+    t.mock.method(fs, "readFileSync", () => JSON.stringify({ foo: "bar" }));
+
+    const payload = await appCache.getPayloadOrNull("foo/bar");
+
+    assert.deepEqual(payload, { foo: "bar" });
+  });
+
+  it("getPayloadOrNull should return null", async(t) => {
+    t.mock.method(fs, "readFileSync", () => {
+      throw new Error("boo");
+    });
+
+    const payload = await appCache.getPayloadOrNull("foo/bar");
+
+    assert.equal(payload, null);
+  });
+
+  it("should update and get payloadsList", async() => {
+    await appCache.updatePayloadsList({ foo: "bar" });
+
+    const updated = await appCache.payloadsList();
+    assert.deepEqual(updated, { foo: "bar" });
+  });
+
+  it("payloadList should throw", async(t) => {
+    t.mock.method(cacache, "get", () => {
+      throw new Error("boo");
+    });
+
+    await assert.rejects(async() => appCache.payloadsList(), {
+      message: "boo"
+    });
+  });
+
+  it("should init payloadsList when starting from zero", async(t) => {
+    appCache.startFromZero = true;
+    t.mock.method(fs, "readdirSync", () => []);
+    t.mock.method(cacache, "get", () => {
+      throw new Error("boo");
+    });
+
+    await appCache.initPayloadsList();
+
+    t.mock.reset();
+
+    const payloadsList = await appCache.payloadsList();
+
+    assert.deepEqual(payloadsList, {
+      lru: [],
+      current: null,
+      older: [],
+      lastUsed: {},
+      root: null
+    });
+  });
+
+  it("should init payloadsList with the root payload json", async(t) => {
+    appCache.startFromZero = false;
+    t.mock.method(fs, "readdirSync", () => []);
+    t.mock.method(fs, "readFileSync", () => JSON.stringify({
+      rootDependencyName: "test_runner",
+      dependencies: {
+        test_runner: {
+          versions: {
+            "1.0.0": {}
+          }
+        }
+      }
+    }));
+    t.mock.method(fs, "writeFileSync", () => void 0);
+    t.mock.method(cacache, "get", () => {
+      throw new Error("boo");
+    });
+    t.mock.method(Date, "now", () => 1234567890);
+
+    await appCache.initPayloadsList();
+
+    t.mock.reset();
+
+    const payloadsList = await appCache.payloadsList();
+
+    assert.deepEqual(payloadsList, {
+      lru: ["test_runner@1.0.0"],
+      current: "test_runner@1.0.0",
+      older: [],
+      lastUsed: { "test_runner@1.0.0": 1234567890 },
+      root: "test_runner@1.0.0"
+    });
+  });
+
+  it("should init payloadsList.older with already scanned payloads", async(t) => {
+    t.mock.method(fs, "readdirSync", () => ["test_runner@1.0.0", "test_runner@2.0.0"]);
+    t.mock.method(cacache, "get", () => {
+      throw new Error("boo");
+    });
+
+    await appCache.initPayloadsList();
+
+    t.mock.reset();
+
+    const payloadsList = await appCache.payloadsList();
+
+    assert.deepEqual(payloadsList, {
+      older: ["test_runner@1.0.0", "test_runner@2.0.0"],
+      current: null,
+      lru: []
+    });
+  });
+
+  it("should remove payload from disk", (t) => {
+    let removedPath;
+    t.mock.method(fs, "rmSync", (path) => {
+      removedPath = path;
+    });
+
+    appCache.removePayload("foo/bar");
+
+    assert.equal(removedPath, path.join(kPayloadsPath, "foo-bar"));
+  });
+
+  it("should not remove the last LRU when LRU is not full", async(t) => {
+    t.mock.method(cacache, "get", () => {
+      return {
+        data: {
+          toString: () => JSON.stringify({
+            lru: ["foo"],
+            older: ["bar"],
+            lastUsed: { foo: 1234567890 },
+            foo: "bar"
+          })
+        }
+      };
+    });
+
+    const result = await appCache.removeLastLRU();
+
+    assert.deepEqual(result, {
+      lru: ["foo"],
+      older: ["bar"],
+      lastUsed: { foo: 1234567890 },
+      foo: "bar"
+    });
+  });
+
+  it("should remove the last LRU when LRU is full", async(t) => {
+    t.mock.method(cacache, "get", () => {
+      return {
+        data: {
+          toString: () => JSON.stringify({
+            lru: ["foo", "foz", "bar"],
+            older: ["boz"],
+            lastUsed: {
+              foo: 123,
+              foz: 1234,
+              bar: 12345
+            },
+            foo: "bar"
+          })
+        }
+      };
+    });
+
+    const result = await appCache.removeLastLRU();
+
+    assert.deepEqual(result, {
+      lru: ["foz", "bar"],
+      older: ["boz", "foo"],
+      lastUsed: {
+        foo: 123,
+        foz: 1234,
+        bar: 12345
+      },
+      foo: "bar"
+    });
+  });
+
+  it("should set local root payload", async(t) => {
+    t.mock.method(fs, "writeFileSync", () => void 0);
+    t.mock.method(Date, "now", () => 1234567890);
+    await appCache.updatePayloadsList({
+      lru: [],
+      current: null,
+      older: [],
+      lastUsed: {},
+      root: null
+    });
+    const payload = {
+      rootDependencyName: "test_runner-local",
+      dependencies: {
+        "test_runner-local": {
+          versions: {
+            "1.0.0": {}
+          }
+        }
+      }
+    };
+    await appCache.setRootPayload(payload, { local: true });
+
+    const result = await appCache.payloadsList();
+
+    assert.deepEqual(result, {
+      lru: ["test_runner-local@1.0.0#local"],
+      current: "test_runner-local@1.0.0#local",
+      older: [],
+      lastUsed: {
+        "test_runner-local@1.0.0#local": 1234567890
+      },
+      root: "test_runner-local@1.0.0#local"
+    });
+  });
+
+  it("should set normal root payload", async(t) => {
+    t.mock.method(fs, "writeFileSync", () => void 0);
+    t.mock.method(Date, "now", () => 1234567890);
+    await appCache.updatePayloadsList({
+      lru: [],
+      current: null,
+      older: [],
+      lastUsed: {},
+      root: null
+    });
+    const payload = {
+      rootDependencyName: "test_runner-local",
+      dependencies: {
+        "test_runner-local": {
+          versions: {
+            "1.0.0": {}
+          }
+        }
+      }
+    };
+    await appCache.setRootPayload(payload, {});
+
+    const result = await appCache.payloadsList();
+
+    assert.deepEqual(result, {
+      lru: ["test_runner-local@1.0.0"],
+      current: "test_runner-local@1.0.0",
+      older: [],
+      lastUsed: {
+        "test_runner-local@1.0.0": 1234567890
+      },
+      root: "test_runner-local@1.0.0"
+    });
+  });
+});