diff --git a/package.json b/package.json
index 109fc3fd06..e2d0027352 100644
--- a/package.json
+++ b/package.json
@@ -60,6 +60,7 @@
   "devDependencies": {
     "@types/chai": "^3.4.35",
     "@types/mocha": "^2.2.39",
+    "@types/sinon": "^4.3.1",
     "awesome-typescript-loader": "^3.4.1",
     "chai": "^3.5.0",
     "glob": "^7.1.2",
@@ -70,6 +71,7 @@
     "replace-in-file": "^3.1.0",
     "rimraf": "^2.5.2",
     "shelljs": "^0.7.7",
+    "sinon": "^5.0.7",
     "tslint": "^5.1.0",
     "typedoc": "^0.9.0",
     "typescript": "2.6.2",
diff --git a/src/export/packer/express.spec.ts b/src/export/packer/express.spec.ts
new file mode 100644
index 0000000000..416d206815
--- /dev/null
+++ b/src/export/packer/express.spec.ts
@@ -0,0 +1,43 @@
+// tslint:disable:typedef space-before-function-paren
+// tslint:disable:no-empty
+// tslint:disable:no-any
+import { assert } from "chai";
+import { stub } from "sinon";
+
+import { ExpressPacker } from "../../export/packer/express";
+import { File, Paragraph } from "../../file";
+
+describe("LocalPacker", () => {
+    let packer: ExpressPacker;
+
+    beforeEach(() => {
+        const file = new File({
+            creator: "Dolan Miu",
+            revision: "1",
+            lastModifiedBy: "Dolan Miu",
+        });
+        const paragraph = new Paragraph("test text");
+        const heading = new Paragraph("Hello world").heading1();
+        file.addParagraph(new Paragraph("title").title());
+        file.addParagraph(heading);
+        file.addParagraph(new Paragraph("heading 2").heading2());
+        file.addParagraph(paragraph);
+
+        const expressResMock = {
+            on: () => {},
+            attachment: () => {},
+        };
+
+        packer = new ExpressPacker(file, expressResMock as any);
+    });
+
+    describe("#pack()", () => {
+        it("should handle exception if it throws any", () => {
+            const compiler = stub((packer as any).packer, "compile");
+            compiler.throwsException();
+            return packer.pack("build/tests/test").catch((error) => {
+                assert.isDefined(error);
+            });
+        });
+    });
+});
diff --git a/src/export/packer/local.spec.ts b/src/export/packer/local.spec.ts
index 16fb99705b..e942fb70a9 100644
--- a/src/export/packer/local.spec.ts
+++ b/src/export/packer/local.spec.ts
@@ -1,5 +1,7 @@
 /* tslint:disable:typedef space-before-function-paren */
+import { assert } from "chai";
 import * as fs from "fs";
+import { stub } from "sinon";
 
 import { LocalPacker } from "../../export/packer/local";
 import { File, Paragraph } from "../../file";
@@ -29,14 +31,36 @@ describe("LocalPacker", () => {
             await packer.pack("build/tests/test");
             fs.statSync("build/tests/test.docx");
         });
+
+        it("should handle exception if it throws any", () => {
+            // tslint:disable-next-line:no-any
+            const compiler = stub((packer as any).packer, "compile");
+            compiler.throwsException();
+            return packer.pack("build/tests/test").catch((error) => {
+                assert.isDefined(error);
+            });
+        });
     });
 
     describe("#packPdf", () => {
         it("should create a standard PDF file", async function() {
             this.timeout(99999999);
 
+            // tslint:disable-next-line:no-any
+            const pdfConverterConvert = stub((packer as any).pdfConverter, "convert");
+            pdfConverterConvert.returns("Test PDF Contents");
+
             await packer.packPdf("build/tests/pdf-test");
             fs.statSync("build/tests/pdf-test.pdf");
         });
+
+        it("should handle exception if it throws any", () => {
+            // tslint:disable-next-line:no-any
+            const compiler = stub((packer as any).packer, "compile");
+            compiler.throwsException();
+            return packer.packPdf("build/tests/pdf-test").catch((error) => {
+                assert.isDefined(error);
+            });
+        });
     });
 });