diff --git a/src/file/paragraph/math/n-ary/math-integral.spec.ts b/src/file/paragraph/math/n-ary/math-integral.spec.ts
new file mode 100644
index 0000000000..0944a3fb2b
--- /dev/null
+++ b/src/file/paragraph/math/n-ary/math-integral.spec.ts
@@ -0,0 +1,68 @@
+import { expect } from "chai";
+
+import { Formatter } from "@export/formatter";
+
+import { MathRun } from "../math-run";
+import { MathIntegral } from "./math-integral";
+
+describe("MathIntegral", () => {
+    describe("#constructor()", () => {
+        it("should create a MathIntegral with correct root key", () => {
+            const mathIntegral = new MathIntegral({
+                children: [new MathRun("1")],
+                subScript: [new MathRun("2")],
+                superScript: [new MathRun("3")],
+            });
+
+            const tree = new Formatter().format(mathIntegral);
+            expect(tree).to.deep.equal({
+                "m:nary": [
+                    {
+                        "m:naryPr": [
+                            {
+                                "m:limLoc": {
+                                    _attr: {
+                                        "m:val": "undOvr",
+                                    },
+                                },
+                            },
+                        ],
+                    },
+                    {
+                        "m:sub": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["2"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                    {
+                        "m:sup": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["3"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                    {
+                        "m:e": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["1"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                ],
+            });
+        });
+    });
+});