Function beforeEach

beforeEach<T>(fn): void
Run some shared setup before each test in the suite.
Type Parameters
- T
  The self type of the function
Parameters
- fn: ((this: T) => void | Promise<void>)
  The function to implement the shared setup behavior
  - - (this): void | Promise<void>
    - Parameters
      this: T
      Returns void | Promise<void>
Returns void
Example: Usage
```
import { describe, it, beforeEach } from "@std/testing/bdd";
import { assertEquals } from "@std/assert";

beforeEach(() => {
 console.log("beforeEach");
});

describe("example", () => {
  it("should pass", () => {
    // test case
    assertEquals(2 + 2, 4);
  });
});
```
- Defined in testing/bdd.ts:984