fix(test): use correct alertmanager option format in tests

ui/src/Components/SilenceModal/SilenceForm.test.js

@@ -167,9 +167,7 @@ describe("<SilenceForm />", () => {
     matcher.name = "job";
     matcher.values = [{ label: "node_exporter", value: "node_exporter" }];
     silenceFormStore.data.matchers = [matcher];
-    silenceFormStore.data.alertmanagers = [
-      { label: "am1", value: "http://example.com" }
-    ];
+    silenceFormStore.data.alertmanagers = [{ label: "am1", value: ["am1"] }];
     silenceFormStore.data.author = "me@example.com";
     silenceFormStore.data.comment = "fake silence";
     const tree = ShallowSilenceForm();

ui/src/Stores/SilenceFormStore.test.js

@@ -31,7 +31,7 @@ const MockGroup = () => {
 
 const MockAlertmanagerOption = () => ({
   label: "default",
-  value: "http://localhost"
+  value: ["default"]
 });
 
 const MockMatcher = (name, values) => {
@@ -209,7 +209,7 @@ describe("SilenceFormStore.data", () => {
     expect(store.data.alertmanagers).toHaveLength(1);
     expect(store.data.alertmanagers[0]).toMatchObject({
       label: alertmanager.name,
-      value: alertmanager.publicURI
+      value: [alertmanager.name]
     });
 
     expect(store.data.matchers).toHaveLength(2);