diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/index.test.js b/ui/src/Components/Grid/AlertGrid/AlertGroup/index.test.js
new file mode 100644
index 000000000..9c71d5cac
--- /dev/null
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/index.test.js
@@ -0,0 +1,173 @@
+import React from "react";
+
+import { Provider } from "mobx-react";
+
+import { mount } from "enzyme";
+
+import moment from "moment";
+
+import { MockAlert, MockAlertGroup } from "__mocks__/Alerts.js";
+import { AlertStore } from "Stores/AlertStore";
+import { Settings } from "Stores/Settings";
+import { SilenceFormStore } from "Stores/SilenceFormStore";
+import { AlertGroup } from ".";
+
+let alertStore;
+let settingsStore;
+let silenceFormStore;
+let group;
+
+const MockGroup = (groupName, alertCount) => {
+  const group = MockAlertGroup(
+    { alertname: "Fake Alert", group: groupName },
+    [],
+    [],
+    {}
+  );
+  return group;
+};
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+  settingsStore = new Settings();
+  silenceFormStore = new SilenceFormStore();
+  group = MockGroup();
+});
+
+const MockAlerts = alertCount => {
+  for (let i = 1; i <= alertCount; i++) {
+    let alert = MockAlert([], { instance: `instance${i}` });
+    const startsAt = moment().toISOString();
+    alert.startsAt = startsAt;
+    alert.alertmanager[0].startsAt = startsAt;
+    group.alerts.push(alert);
+  }
+};
+
+const MountedAlertGroup = (afterUpdate, showAlertmanagers) => {
+  return mount(
+    <Provider alertStore={alertStore}>
+      <AlertGroup
+        afterUpdate={afterUpdate}
+        group={group}
+        showAlertmanagers={showAlertmanagers}
+        settingsStore={settingsStore}
+        silenceFormStore={silenceFormStore}
+      />
+    </Provider>
+  );
+};
+
+describe("<AlertGroup />", () => {
+  it("renders Alertmanager labels in footer if showAlertmanagersInFooter=true", () => {
+    MockAlerts(2);
+    const tree = MountedAlertGroup(jest.fn(), true).find("AlertGroup");
+    expect(tree.find("GroupFooter").html()).toMatch(/@alertmanager: default/);
+  });
+
+  it("only renders titlebar when collapsed", () => {
+    MockAlerts(10);
+    const tree = MountedAlertGroup(jest.fn(), false);
+    const alertGroup = tree.find("AlertGroup");
+    alertGroup.instance().collapse.toggle();
+    expect(alertGroup.instance().collapse.value).toBe(true);
+    tree.update();
+    expect(tree.find("Alert")).toHaveLength(0);
+    expect(tree.find("ul.list-group")).toHaveLength(0);
+  });
+});
+
+const ValidateLoadButtonPresent = (totalAlerts, isPresent) => {
+  MockAlerts(totalAlerts);
+  const tree = MountedAlertGroup(jest.fn(), false);
+  const buttons = tree.find("button");
+  expect(buttons).toHaveLength(isPresent ? 2 : 0);
+};
+
+const ValidateLoadButtonAction = (
+  totalAlerts,
+  buttonIndex,
+  iconMatch,
+  loadedAlerts,
+  alertsToRenderBeforeClick
+) => {
+  MockAlerts(totalAlerts);
+  const tree = MountedAlertGroup(jest.fn(), false);
+  if (alertsToRenderBeforeClick !== undefined) {
+    tree
+      .find("AlertGroup")
+      .instance().renderConfig.alertsToRender = alertsToRenderBeforeClick;
+    tree.update();
+  }
+  const loadMore = tree.find("button").at(buttonIndex);
+  expect(loadMore.html()).toMatch(iconMatch);
+  loadMore.simulate("click");
+  tree.update();
+  expect(tree.find("Alert")).toHaveLength(loadedAlerts);
+};
+
+describe("<AlertGroup /> renderConfig", () => {
+  it("settingsStore.alertGroupConfig.config.defaultRenderCount should be 5 by default", () => {
+    expect(settingsStore.alertGroupConfig.config.defaultRenderCount).toBe(5);
+  });
+
+  it("renderConfig.alertsToRender should be 5 by default", () => {
+    const tree = MountedAlertGroup(jest.fn(), false).find("AlertGroup");
+    expect(tree.instance().renderConfig.alertsToRender).toBe(5);
+  });
+
+  it("renders only up to renderConfig.alertsToRender alerts", () => {
+    MockAlerts(50);
+    const tree = MountedAlertGroup(jest.fn(), false).find("AlertGroup");
+    const alerts = tree.find("Alert");
+    expect(alerts).toHaveLength(tree.instance().renderConfig.alertsToRender);
+  });
+
+  it("load buttons are not rendered for 1 alert", () => {
+    ValidateLoadButtonPresent(1, false);
+  });
+
+  it("load buttons are not rendered for 5 alerts", () => {
+    ValidateLoadButtonPresent(5, false);
+  });
+
+  it("load buttons are rendered for 6 alert", () => {
+    ValidateLoadButtonPresent(6, true);
+  });
+
+  it("clicking - icon hides 1 alert if there's 6 in total", () => {
+    ValidateLoadButtonAction(6, 0, /fa-minus/, 5, 6);
+  });
+
+  it("clicking - icon hides 1 alert if there's 6 in total and we're showing 3", () => {
+    ValidateLoadButtonAction(6, 0, /fa-minus/, 2, 3);
+  });
+
+  it("clicking - icon hides 2 alerts if there's 7 in total and we're showing 7", () => {
+    ValidateLoadButtonAction(7, 0, /fa-minus/, 5, 7);
+  });
+
+  it("clicking - icon hides 5 alerts if there's 10 in total and we're showing 10", () => {
+    ValidateLoadButtonAction(10, 0, /fa-minus/, 5, 10);
+  });
+
+  it("clicking - icon hides 5 alerts if there's 18 in total and we're showing 17", () => {
+    ValidateLoadButtonAction(18, 0, /fa-minus/, 12, 17);
+  });
+
+  it("clicking + icon loads 1 more alert if there's 6 in total", () => {
+    ValidateLoadButtonAction(6, 1, /fa-plus/, 6);
+  });
+
+  it("clicking + icon loads 4 more alert if there's 9 in total", () => {
+    ValidateLoadButtonAction(9, 1, /fa-plus/, 9);
+  });
+
+  it("clicking + icon loads 5 more alert if there's 14 in total", () => {
+    ValidateLoadButtonAction(14, 1, /fa-plus/, 10);
+  });
+
+  it("clicking + icon loads 5 more alert if there's 25 in total and we're showing 16", () => {
+    ValidateLoadButtonAction(25, 1, /fa-plus/, 22, 17);
+  });
+});