DEV: Move RSpec test file into test folder (#27437)

Test was not being run because it was in the wrong folder

spec/lib/discourse_ip_info_spec.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+RSpec.describe DiscourseIpInfo do
+  describe ".mmdb_download" do
+    it "should download the MaxMind databases from MaxMind's download permalinks when `maxmind_license_key` and `maxmind_account_id` global setting has been set" do
+      global_setting :maxmind_license_key, "license_key"
+      global_setting :maxmind_account_id, "account_id"
+
+      stub_request(
+        :get,
+        "https://download.maxmind.com/geoip/databases/GeoLite2-City/download?suffix=tar.gz",
+      ).with(basic_auth: %w[account_id license_key]).to_return(
+        status: 302,
+        body: "",
+        headers: {
+          location:
+            "https://mm-prod-geoip-databases.a2649acb697e2c09b632799562c076f2.r2.cloudflarestorage.com/some-path",
+        },
+      )
+
+      stub_request(
+        :get,
+        "https://mm-prod-geoip-databases.a2649acb697e2c09b632799562c076f2.r2.cloudflarestorage.com/some-path",
+      ).with { |req| expect(req.headers.key?("Authorization")).to eq(false) }.to_return(status: 200)
+
+      described_class.mmdb_download("GeoLite2-City")
+    end
+
+    it "should download the MaxMind databases from MaxMind's undocumented download URL when `maxmind_license_key` global setting has been set but not `maxmind_account_id` for backwards compatibility reasons" do
+      global_setting :maxmind_license_key, "license_key"
+
+      stub_request(
+        :get,
+        "https://download.maxmind.com/app/geoip_download?license_key=license_key&edition_id=GeoLite2-City&suffix=tar.gz",
+      ).to_return(status: 200, body: "", headers: {})
+
+      described_class.mmdb_download("GeoLite2-City")
+    end
+
+    it "should download the MaxMind databases from the right URL when `maxmind_mirror_url` global setting has been configured" do
+      global_setting :maxmind_mirror_url, "https://b.www.example.com/mirror"
+
+      stub_request(:get, "https://b.www.example.com/mirror/GeoLite2-City.tar.gz").to_return(
+        status: 200,
+        body: "",
+      )
+
+      described_class.mmdb_download("GeoLite2-City")
+    end
+
+    it "should download the MaxMind databases from the right URL when `maxmind_mirror_url` global setting has been configured and has a trailing slash" do
+      global_setting :maxmind_mirror_url, "https://b.www.example.com/mirror/"
+
+      stub_request(:get, "https://b.www.example.com/mirror/GeoLite2-City.tar.gz").to_return(
+        status: 200,
+        body: "",
+      )
+
+      described_class.mmdb_download("GeoLite2-City")
+    end
+  end
+end