diff --git a/test/managers/MessageReactionManager.js b/test/managers/MessageReactionManager.js
new file mode 100644
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--- /dev/null
+++ b/test/managers/MessageReactionManager.js
@@ -0,0 +1,164 @@
+import { expect } from "chai";
+import MessageReactionManager from "../../src/managers/MessageReactionManager.js";
+import { TEST_CLIENTS, TEST_DATA, TEST_GUILDS } from "../../src/testData.js";
+import { TO_JSON_TYPES_ENUM } from "../../src/constants.js";
+
+describe("MessageReactionManager", function () {
+  context("check import", function () {
+    it("should be a function", function () {
+      expect(MessageReactionManager).to.be.a("function");
+    });
+  });
+
+  context("check structure", function () {
+    it("should create a new instance of MessageReactionManager with the correct options", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(messageReactionManager).to.be.an.instanceOf(
+        MessageReactionManager,
+      );
+      expect(messageReactionManager).to.have.property("_addReaction");
+      expect(messageReactionManager).to.have.property("_removeReaction");
+      expect(messageReactionManager).to.have.property("toJSON");
+    });
+  });
+
+  context("check _addReaction method", function () {
+    it("should add a reaction to a message", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      messageReactionManager._addReaction(
+        "123456",
+        TEST_DATA.STANDARD_EMOJI.name,
+        TEST_DATA.REACTION,
+      );
+      expect(
+        messageReactionManager.toJSON(TO_JSON_TYPES_ENUM.CACHE_FORMAT),
+      ).to.have.property(TEST_DATA.STANDARD_EMOJI.name);
+    });
+    it("should throw an error if userId is not a string", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._addReaction(
+          123456,
+          TEST_DATA.STANDARD_EMOJI.name,
+          TEST_DATA.REACTION,
+        ),
+      ).to.throw(TypeError, "GLUON: User ID must be a string.");
+    });
+    it("should throw an error if emoji is not a string", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._addReaction(
+          "123456",
+          123456,
+          TEST_DATA.REACTION,
+        ),
+      ).to.throw(TypeError, "GLUON: Emoji must be a string.");
+    });
+    it("should throw an error if data is not an object", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._addReaction(
+          "123456",
+          TEST_DATA.STANDARD_EMOJI.name,
+          123456,
+        ),
+      ).to.throw(TypeError, "GLUON: Data must be an object.");
+    });
+  });
+
+  context("check _removeReaction method", function () {
+    it("should remove a reaction from a message", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      messageReactionManager._addReaction(
+        "123456",
+        TEST_DATA.STANDARD_EMOJI.name,
+        TEST_DATA.REACTION,
+      );
+      messageReactionManager._removeReaction(
+        "123456",
+        TEST_DATA.STANDARD_EMOJI.name,
+      );
+      expect(
+        messageReactionManager.toJSON(TO_JSON_TYPES_ENUM.CACHE_FORMAT),
+      ).to.not.have.property(TEST_DATA.STANDARD_EMOJI.name);
+    });
+    it("should throw an error if userId is not a string", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._removeReaction(
+          123456,
+          TEST_DATA.STANDARD_EMOJI.name,
+        ),
+      ).to.throw(TypeError, "GLUON: User ID must be a string.");
+    });
+    it("should throw an error if emoji is not a string", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._removeReaction("123456", 123456),
+      ).to.throw(TypeError, "GLUON: Emoji must be a string.");
+    });
+    it("should not throw an error if the reaction does not exist", function () {
+      const client = TEST_CLIENTS.ALL_CACHES_ENABLED();
+      const guild = TEST_GUILDS.ALL_CACHES_ENABLED(client);
+      const messageReactionManager = new MessageReactionManager(
+        client,
+        guild,
+        {},
+      );
+      expect(() =>
+        messageReactionManager._removeReaction(
+          "123456",
+          TEST_DATA.STANDARD_EMOJI.name,
+        ),
+      ).to.not.throw();
+    });
+  });
+});