Add tests for array branh labelling

__tests__/fixtures/branches.yml

@@ -6,3 +6,6 @@ feature-branch:
 
 bug-branch:
   - branch: "{bug,fix}/*"
+
+array-branch:
+  - branch: ["array/*", "*/array/*"]

__tests__/main.test.ts

@@ -147,6 +147,20 @@ describe("run", () => {
       labels: ["bug-branch"],
     });
   });
+
+  it("it can support multiple branches by providing an array", async () => {
+    github.context.payload.pull_request!.head = { ref: "array/123" };
+    usingLabelerConfigYaml("branches.yml");
+    await run();
+
+    expect(addLabelsMock).toHaveBeenCalledTimes(1);
+    expect(addLabelsMock).toHaveBeenCalledWith({
+      owner: "monalisa",
+      repo: "helloworld",
+      issue_number: 123,
+      labels: ["array-branch"],
+    });
+  });
 });
 
 function usingLabelerConfigYaml(fixtureName: keyof typeof yamlFixtures): void {