Add spec for `AvatarComponent`

spec/components/avatar_component_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe AvatarComponent, type: :component do
+  let(:user) { FactoryBot.create(:user) }
+
+  it "renders an avatar" do
+    expect(
+      render_inline(described_class.new(user:, size: "sm")).to_html,
+    ).to include(
+      "no_avatar.png",
+    )
+  end
+
+  it "gets the medium version of a profile picture if requested" do
+    expect(
+      render_inline(described_class.new(user:, size: "md")).to_html,
+    ).to include(
+      "medium/",
+    )
+  end
+
+  it "gets the large version of a profile picture if requested" do
+    expect(
+      render_inline(described_class.new(user:, size: "xl")).to_html,
+    ).to include(
+      "large/",
+    )
+  end
+
+  it "includes additionally passed classes" do
+    expect(
+      render_inline(described_class.new(user:, size: "md", classes: %w[first-class second-class])).to_html,
+    ).to include(
+      'class="avatar-md first-class second-class"',
+    )
+  end
+end