diff --git a/src/file/paragraph/run/run.spec.ts b/src/file/paragraph/run/run.spec.ts
index b2027c2cfb..d065181fb4 100644
--- a/src/file/paragraph/run/run.spec.ts
+++ b/src/file/paragraph/run/run.spec.ts
@@ -8,8 +8,38 @@ import { EmphasisMarkType } from "./emphasis-mark";
 import { PageNumber, Run } from "./run";
 import { UnderlineType } from "./underline";
 import { TextEffect } from "./properties";
-
 describe("Run", () => {
+    describe("#noproof()", () => {
+        it("turns off spelling and grammar checkers for a run", () => {
+            const run = new Run({
+                noProof: true,
+            });
+            const tree = new Formatter().format(run);
+            expect(tree).to.deep.equal({
+                "w:r": [
+                    {
+                        "w:rPr": [
+                            { "w:noProof": {} },
+                        ],
+                    },
+                ],
+            });
+        });
+        const run = new Run({
+            noProof: false,
+        });
+        const tree = new Formatter().format(run);
+        expect(tree).to.deep.equal({
+            "w:r": [
+                {
+                    "w:rPr": [
+                        { "w:noProof": { _attr: { "w:val": false } } },
+                    ],
+                },
+            ],
+        });
+    });
+
     describe("#bold()", () => {
         it("it should add bold to the properties", () => {
             const run = new Run({