diff --git a/ui/src/Components/SilenceModal/SilenceForm.test.js b/ui/src/Components/SilenceModal/SilenceForm.test.js
new file mode 100644
index 000000000..5db5e0f64
--- /dev/null
+++ b/ui/src/Components/SilenceModal/SilenceForm.test.js
@@ -0,0 +1,109 @@
+import React from "react";
+
+import { mount, shallow } from "enzyme";
+
+import { AlertStore } from "Stores/AlertStore";
+import { SilenceFormStore } from "Stores/SilenceFormStore";
+import { SilenceForm } from "./SilenceForm";
+
+let alertStore;
+let silenceFormStore;
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+  silenceFormStore = new SilenceFormStore();
+});
+
+const ShallowSilenceForm = () => {
+  return shallow(
+    <SilenceForm alertStore={alertStore} silenceFormStore={silenceFormStore} />
+  );
+};
+
+const MountedSilenceForm = () => {
+  return mount(
+    <SilenceForm alertStore={alertStore} silenceFormStore={silenceFormStore} />
+  );
+};
+
+describe("<SilenceForm /> matchers", () => {
+  it("has an empty matcher selects on default render", () => {
+    const tree = ShallowSilenceForm();
+    const matchers = tree.find("SilenceMatch");
+    expect(matchers).toHaveLength(1);
+    expect(silenceFormStore.data.matchers).toHaveLength(1);
+  });
+
+  it("clicking 'Add more' button adds another matcher", () => {
+    const tree = ShallowSilenceForm();
+    const button = tree.find("button[type='button']");
+    button.simulate("click", { preventDefault: jest.fn() });
+    const matchers = tree.find("SilenceMatch");
+    expect(matchers).toHaveLength(2);
+    expect(silenceFormStore.data.matchers).toHaveLength(2);
+  });
+
+  it("clicking trash icon on a matcher select removes it", () => {
+    silenceFormStore.data.addEmptyMatcher();
+    silenceFormStore.data.addEmptyMatcher();
+    silenceFormStore.data.addEmptyMatcher();
+    const tree = MountedSilenceForm();
+    expect(silenceFormStore.data.matchers).toHaveLength(3);
+
+    const matchers = tree.find("SilenceMatch");
+    const toDelete = matchers.at(1);
+    const button = toDelete.find("button");
+    button.simulate("click");
+    expect(silenceFormStore.data.matchers).toHaveLength(2);
+  });
+});
+
+describe("<SilenceForm /> preview", () => {
+  it("doesn't render SilencePreview when previewCollapse.hidden is true", () => {
+    const tree = ShallowSilenceForm();
+    const instance = tree.instance();
+    instance.previewCollapse.hidden = true;
+    expect(tree.find("SilencePreview")).toHaveLength(0);
+  });
+
+  it("renders SilencePreview when previewCollapse.hidden is false", () => {
+    const tree = ShallowSilenceForm();
+    const instance = tree.instance();
+    instance.previewCollapse.hidden = false;
+    expect(tree.find("SilencePreview")).toHaveLength(1);
+  });
+
+  it("clicking on the toggle icon toggles SilencePreview", () => {
+    const tree = ShallowSilenceForm();
+    const button = tree.find("a.btn.cursor-pointer.text-muted");
+    expect(tree.find("SilencePreview")).toHaveLength(0);
+    button.simulate("click");
+    expect(tree.find("SilencePreview")).toHaveLength(1);
+    button.simulate("click");
+    expect(tree.find("SilencePreview")).toHaveLength(0);
+  });
+});
+
+describe("<SilenceForm /> inputs", () => {
+  it("changing author input updates SilenceFormStore", () => {
+    const tree = MountedSilenceForm();
+    const input = tree.find("input[placeholder='Author email']");
+    input.simulate("change", { target: { value: "me@example.com" } });
+    expect(silenceFormStore.data.author).toBe("me@example.com");
+  });
+
+  it("changing comment input updates SilenceFormStore", () => {
+    const tree = MountedSilenceForm();
+    const input = tree.find("input[placeholder='Comment']");
+    input.simulate("change", { target: { value: "fake comment" } });
+    expect(silenceFormStore.data.comment).toBe("fake comment");
+  });
+});
+
+describe("<SilenceForm />", () => {
+  it("calling submit marks form as in progress", () => {
+    const tree = ShallowSilenceForm();
+    tree.simulate("submit", { preventDefault: jest.fn() });
+    expect(silenceFormStore.data.inProgress).toBe(true);
+  });
+});
diff --git a/ui/src/Components/SilenceModal/SilenceModalContent.test.js b/ui/src/Components/SilenceModal/SilenceModalContent.test.js
new file mode 100644
index 000000000..5d570f8fe
--- /dev/null
+++ b/ui/src/Components/SilenceModal/SilenceModalContent.test.js
@@ -0,0 +1,40 @@
+import React from "react";
+
+import { shallow } from "enzyme";
+
+import { AlertStore } from "Stores/AlertStore";
+import { SilenceFormStore } from "Stores/SilenceFormStore";
+import { SilenceModalContent } from "./SilenceModalContent";
+
+let alertStore;
+let silenceFormStore;
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+  silenceFormStore = new SilenceFormStore();
+});
+
+const ShallowSilenceModalContent = () => {
+  return shallow(
+    <SilenceModalContent
+      alertStore={alertStore}
+      silenceFormStore={silenceFormStore}
+    />
+  );
+};
+
+describe("<SilenceModalContent />", () => {
+  it("renders SilenceForm when silenceFormStore.data.inProgress is false", () => {
+    silenceFormStore.data.inProgress = false;
+    const tree = ShallowSilenceModalContent();
+    const form = tree.find("SilenceForm");
+    expect(form).toHaveLength(1);
+  });
+
+  it("renders SilenceSubmitController when silenceFormStore.data.inProgress is true", () => {
+    silenceFormStore.data.inProgress = true;
+    const tree = ShallowSilenceModalContent();
+    const ctrl = tree.find("SilenceSubmitController");
+    expect(ctrl).toHaveLength(1);
+  });
+});