Remove all tests from the gem

test/HELP_WHY_TESTS_ARE_EMPTY.md

@@ -0,0 +1,8 @@
+Tracksperanto has a huge test corpus of source and destination files, which is stored in the project's Github repo.
+This is why the repo is so big. Bundling tests with the tracksperanto gem increases the size from 100+ KB to
+over 4 MB, and most people installing Tracksperanto do not need this test data.
+
+If you intend to actually write code that uses Tracksperanto or to fix
+a bug, you will most definitely need all the test data. In that case, just do a git checkout. Check
+the Tracksperanto::VERSION and check out the corresponding Git tag from our
+Github repository at https://github.com/guerilla-di/tracksperanto

tracksperanto.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   end.reject do |f|
     f.start_with? "test/subpixel"
   end
-
+  spec.files << "test/HELP_WHY_TESTS_ARE_EMPTY.md"
   spec.bindir = "bin"
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]