Add test font as submodule

.gitmodules

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+[submodule "fonts/test"]
+	path = fonts/test
+	url = http://clancy.genet-godzilla.ts.net:3002/fishy/homebrew-font-test.git

Formula/font-test.rb

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+class FontTest < Formula
+  desc "Test font"
+  homepage "http://clancy.genet-godzilla.ts.net:3002/fishy/homebrew-font-test"
+  url "http://clancy.genet-godzilla.ts.net:3002/fishy/homebrew-font-test/raw/branch/main/test.zip"
+  sha256 "b6de15290696645b8cb5a6a96f9124f0a87e65f85b23f7369f4e412c67306c59"
+  version "1.0.0"
+
+  def install
+    (share/"fonts").install Dir["*.zip"]
+  end
+
+  test do
+    assert_predicate share/"fonts/#test.#zip", :exist?
+  end
+end

fonts/index.json

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+{
+  "fonts": [
+    {
+      "name": "buffalo",
+      "path": "fonts/buffalo",
+      "formula": "font-buffalo"
+    },
+    {
+      "name": "test",
+      "path": "fonts/test",
+      "formula": "font-test"
+    }
+  ]
+}

fonts/test

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+Subproject commit 68f09e1435eaf27c7bad8e3c48ca3c3f2a1c662c