DEV: Move spec/components to spec/lib (#15987)

Lib specs were inexplicably split into two directories (`lib` and `components`)

This moves them all into `lib`.

spec/lib/plugin/metadata_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Plugin::Metadata do
+  context "parse" do
+    it "correctly parses plugin info" do
+      metadata = Plugin::Metadata.parse <<TEXT
+# name: plugin-name
+# about: about: my plugin
+# version: 0.1
+# authors: Frank Zappa
+# contact emails: frankz@example.com
+# url: http://discourse.org
+# required version: 1.3.0beta6+48
+
+some_ruby
+TEXT
+
+      expect(metadata.name).to eq("plugin-name")
+      expect(metadata.about).to eq("about: my plugin")
+      expect(metadata.version).to eq("0.1")
+      expect(metadata.authors).to eq("Frank Zappa")
+      expect(metadata.contact_emails).to eq("frankz@example.com")
+      expect(metadata.url).to eq("http://discourse.org")
+      expect(metadata.required_version).to eq("1.3.0beta6+48")
+    end
+  end
+
+  def official(name)
+    metadata = Plugin::Metadata.parse <<TEXT
+# name: #{name}
+TEXT
+
+    expect(metadata.official?).to eq(true)
+  end
+
+  def unofficial(name)
+    metadata = Plugin::Metadata.parse <<TEXT
+# name: #{name}
+TEXT
+
+    expect(metadata.official?).to eq(false)
+  end
+
+  it "correctly detects official vs unofficial plugins" do
+    official("discourse-adplugin")
+    official("discourse-akismet")
+    official("discourse-cakeday")
+    official("Canned Replies")
+    official("discourse-data-explorer")
+    unofficial("babble")
+  end
+
+end