Fix AvatarField

Change-Id: I9614163942fcb8667885b524caf944500605c55d

src/components/AvatarField.test.js

@@ -0,0 +1,18 @@
+import React from "react";
+import { RecordContextProvider } from "react-admin";
+import { render, screen } from "@testing-library/react";
+import AvatarField from "./AvatarField";
+
+describe("AvatarField", () => {
+  it("shows image", () => {
+    const value = {
+      avatar: "foo",
+    };
+    render(
+      <RecordContextProvider value={value}>
+        <AvatarField source="avatar" />
+      </RecordContextProvider>
+    );
+    expect(screen.getByRole("img").getAttribute("src")).toBe("foo");
+  });
+});