diff --git a/__tests__/plugins/signed-integrity.test.js b/__tests__/plugins/signed-integrity.test.js
index 2aaf35c..d1a7737 100644
--- a/__tests__/plugins/signed-integrity.test.js
+++ b/__tests__/plugins/signed-integrity.test.js
@@ -92,6 +92,9 @@ describe("plugin: signed-integrity", () => {
                                     content = '{"test": "fail"}'
                                     status = 404
                                     statusText = "Not Found"
+                                // testing invalid base64-encoded data
+                                } else if (url == 'https://resilient.is/invalid-base64.json.integrity') {
+                                    content = 'a' + '.' + payload + '.' + signature
                                 // testing "alg: none" on the integrity JWT
                                 } else if (url == 'https://resilient.is/alg-none.json.integrity') {
                                     content = noneHeader + '.' + payload + '.'
@@ -158,6 +161,20 @@ describe("plugin: signed-integrity", () => {
     }
   });
   
+  test("it should throw an error if the configured public key is impossible to load", async () => {
+    require("../../plugins/signed-integrity.js");
+    
+    init.publicKey = 'NOTAKEY'
+    
+    expect.assertions(2);
+    try {
+      await LibResilientPluginConstructors.get('signed-integrity')(LR, init).fetch('https://resilient.is/test.json')
+    } catch (e) {
+      expect(e).toBeInstanceOf(Error)
+      expect(e.toString()).toMatch('Unable to load the public key')
+    }
+  });
+  
   test("it should throw an error when there are more than one wrapped plugins configured", async () => {
     require("../../plugins/signed-integrity.js");
     init = {
@@ -229,6 +246,20 @@ describe("plugin: signed-integrity", () => {
     }
   });
   
+  test("it should refuse to fetch content when integrity data not provided and integrity data URL is fetched, but JWT is invalid", async () => {
+    require("../../plugins/signed-integrity.js");
+    
+    expect.assertions(4);
+    try {
+      const response = await LibResilientPluginConstructors.get('signed-integrity')(LR, init).fetch('https://resilient.is/invalid-base64.json', {});
+    } catch (e) {
+      expect(resolvingFetch).toHaveBeenCalledTimes(1);
+      expect(resolvingFetch).toHaveBeenCalledWith('https://resilient.is/invalid-base64.json.integrity')
+      expect(e).toBeInstanceOf(Error)
+      expect(e.toString()).toMatch('Invalid base64-encoded string')
+    }
+  });
+  
   test("it should refuse to fetch content when integrity data not provided and integrity data URL is fetched, but JWT uses alg: none", async () => {
     require("../../plugins/signed-integrity.js");