diff --git a/ui/src/Components/MainModal/Configuration/AlertGroupSortConfiguration.test.js b/ui/src/Components/MainModal/Configuration/AlertGroupSortConfiguration.test.js
index 822e20701..18d92918d 100644
--- a/ui/src/Components/MainModal/Configuration/AlertGroupSortConfiguration.test.js
+++ b/ui/src/Components/MainModal/Configuration/AlertGroupSortConfiguration.test.js
@@ -146,7 +146,7 @@ describe("<AlertGroupSortConfiguration />", () => {
   });
 
   it("label select handles fetch errors", async () => {
-    fetch.mockReject("error");
+    fetch.mockReject(new Error("Fetch error"));
     const tree = await ExpandSortLabelSuggestions();
     const options = tree.find("div.react-select__option");
     expect(options).toHaveLength(0);
diff --git a/ui/src/Components/ManagedSilence/DeleteSilence.test.js b/ui/src/Components/ManagedSilence/DeleteSilence.test.js
index 520341727..296b8d828 100644
--- a/ui/src/Components/ManagedSilence/DeleteSilence.test.js
+++ b/ui/src/Components/ManagedSilence/DeleteSilence.test.js
@@ -136,7 +136,7 @@ describe("<DeleteSilenceModalContent />", () => {
   it("renders ErrorMessage on failed fetch", async () => {
     jest.spyOn(console, "trace").mockImplementation(() => {});
     fetch.resetMocks();
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     const tree = MountedDeleteSilenceModalContent();
     await expect(tree.instance().previewState.fetch).resolves.toBeUndefined();
@@ -148,7 +148,7 @@ describe("<DeleteSilenceModalContent />", () => {
     fetch.mockResponseOnce("not json");
     jest.spyOn(console, "trace").mockImplementation(() => {});
     fetch.resetMocks();
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     const tree = MountedDeleteSilenceModalContent();
     await expect(tree.instance().previewState.fetch).resolves.toBeUndefined();
@@ -248,7 +248,7 @@ describe("<DeleteSilenceModalContent />", () => {
 
     jest.spyOn(console, "trace").mockImplementation(() => {});
     fetch.resetMocks();
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     tree.find(".btn-danger").simulate("click");
     await expect(tree.instance().deleteState.fetch).resolves.toBeUndefined();
diff --git a/ui/src/Components/NavBar/FilterInput/index.test.js b/ui/src/Components/NavBar/FilterInput/index.test.js
index 79cf862d7..d5a15c2ad 100644
--- a/ui/src/Components/NavBar/FilterInput/index.test.js
+++ b/ui/src/Components/NavBar/FilterInput/index.test.js
@@ -196,7 +196,7 @@ describe("<FilterInput Autosuggest />", () => {
   });
 
   it("handles failed suggestion fetches", async () => {
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     const tree = MountedInput();
     const instance = tree.instance();
diff --git a/ui/src/Components/SilenceModal/SilenceMatch/LabelNameInput.test.js b/ui/src/Components/SilenceModal/SilenceMatch/LabelNameInput.test.js
index abf313ac3..f098b47e7 100644
--- a/ui/src/Components/SilenceModal/SilenceMatch/LabelNameInput.test.js
+++ b/ui/src/Components/SilenceModal/SilenceMatch/LabelNameInput.test.js
@@ -114,7 +114,7 @@ describe("<LabelNameInput />", () => {
   });
 
   it("handles fetch errors when populating suggestions", async () => {
-    fetch.mockReject("error");
+    fetch.mockReject(new Error("Fetch error"));
     const tree = MountedLabelNameInput(true);
     const instance = tree.instance();
     await expect(instance.nameSuggestionsFetch).resolves.toBeUndefined();
diff --git a/ui/src/Components/SilenceModal/SilenceMatch/MatchCounter.test.js b/ui/src/Components/SilenceModal/SilenceMatch/MatchCounter.test.js
index bbe8be648..781f612a8 100644
--- a/ui/src/Components/SilenceModal/SilenceMatch/MatchCounter.test.js
+++ b/ui/src/Components/SilenceModal/SilenceMatch/MatchCounter.test.js
@@ -42,7 +42,7 @@ describe("<MatchCounter />", () => {
     const consoleSpy = jest
       .spyOn(console, "trace")
       .mockImplementation(() => {});
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     // we need to set name & value to trigger fetch
     matcher.name = "foo";
@@ -55,7 +55,7 @@ describe("<MatchCounter />", () => {
 
   it("renders error icon on failed fetch", async () => {
     jest.spyOn(console, "trace").mockImplementation(() => {});
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     // we need to set name & value to trigger fetch
     matcher.name = "foo";
diff --git a/ui/src/Components/SilenceModal/SilencePreview/index.test.js b/ui/src/Components/SilenceModal/SilencePreview/index.test.js
index dee89e625..18c123d9b 100644
--- a/ui/src/Components/SilenceModal/SilencePreview/index.test.js
+++ b/ui/src/Components/SilenceModal/SilencePreview/index.test.js
@@ -125,7 +125,7 @@ describe("<SilencePreview />", () => {
     const consoleSpy = jest
       .spyOn(console, "trace")
       .mockImplementation(() => {});
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     const tree = MountedSilencePreview();
     await expect(tree.instance().matchedAlerts.fetch).resolves.toBeUndefined();
diff --git a/ui/src/Stores/AlertStore.test.js b/ui/src/Stores/AlertStore.test.js
index 8741cd1ab..aa7792d0c 100644
--- a/ui/src/Stores/AlertStore.test.js
+++ b/ui/src/Stores/AlertStore.test.js
@@ -370,14 +370,9 @@ describe("AlertStore.fetch", () => {
     const consoleSpy = jest
       .spyOn(console, "trace")
       .mockImplementation(() => {});
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
 
     const store = new AlertStore([]);
-    store.retryConfig = {
-      retries: 5,
-      minTimeout: 10,
-      maxTimeout: 10
-    };
     await expect(store.fetch()).resolves.toHaveProperty("error");
 
     expect(global.fetch).toHaveBeenCalledTimes(6);
@@ -388,28 +383,20 @@ describe("AlertStore.fetch", () => {
   });
 
   it("fetch() retries on failure", async () => {
+    jest.spyOn(console, "trace").mockImplementation(() => {});
     const store = new AlertStore([]);
-    store.retryConfig = {
-      retries: 5,
-      minTimeout: 10,
-      maxTimeout: 10
-    };
 
-    fetch.mockReject("Fetch error");
-    await expect(store.fetch()).rejects.toBeTruthy();
+    fetch.mockReject(new Error("Fetch error"));
+    await expect(store.fetch()).resolves.toHaveProperty("error");
     expect(global.fetch).toHaveBeenCalledTimes(6);
   });
 
   it("fetch() retry counter is reset after successful fetch", async () => {
+    jest.spyOn(console, "trace").mockImplementation(() => {});
     const store = new AlertStore(["label=value"]);
-    store.retryConfig = {
-      retries: 5,
-      minTimeout: 10,
-      maxTimeout: 10
-    };
 
-    fetch.mockReject("Fetch error");
-    await expect(store.fetch()).rejects.toBeTruthy();
+    fetch.mockReject(new Error("Fetch error"));
+    await expect(store.fetch()).resolves.toHaveProperty("error");
     expect(global.fetch).toHaveBeenCalledTimes(6);
 
     const response = EmptyAPIResponse();
@@ -417,22 +404,17 @@ describe("AlertStore.fetch", () => {
     await expect(store.fetch()).resolves.toBeUndefined();
     expect(global.fetch).toHaveBeenCalledTimes(7);
 
-    fetch.mockReject("Fetch error");
-    await expect(store.fetch()).rejects.toBeTruthy();
+    fetch.mockReject(new Error("Fetch error"));
+    await expect(store.fetch()).resolves.toHaveProperty("error");
     expect(global.fetch).toHaveBeenCalledTimes(13);
   });
 
   it("unapplied filters are marked as applied on fetch error", async () => {
     const store = new AlertStore([NewUnappliedFilter("foo")]);
-    store.retryConfig = {
-      retries: 5,
-      minTimeout: 10,
-      maxTimeout: 10
-    };
     store.filters.values[0].applied = false;
 
     jest.spyOn(console, "trace").mockImplementation(() => {});
-    fetch.mockReject("Fetch error");
+    fetch.mockReject(new Error("Fetch error"));
     await expect(store.fetch()).resolves.toHaveProperty("error");
     expect(store.filters.values[0].applied).toBe(true);
   });