test: cover CacheStoreTest, test_write_then_read_round_trips

test/test_cli_assets_precompile.rb

@@ -0,0 +1,58 @@
+require 'minitest/autorun'
+require 'prism'
+require 'tmpdir'
+require 'fileutils'
+require 'stringio'
+
+class CliAssetsPrecompileTest < Minitest::Test
+  def setup
+    @dir = Dir.mktmpdir('prism-cli-assets')
+    @cli = Prism::Cli.new(@dir)
+    @source = File.join(@dir, 'app', 'assets')
+    @output = File.join(@dir, 'public', 'assets')
+    FileUtils.mkdir_p(File.join(@source, 'stylesheets'))
+    File.write(File.join(@source, 'stylesheets', 'application.css'), 'body { color: red; }')
+  end
+
+  def teardown
+    FileUtils.remove_entry(@dir)
+  end
+
+  def test_precompiles_without_booting_an_application
+    manifest = @cli.assets_precompile(['--source=app/assets', '--output=public/assets'], out: StringIO.new)
+    logical = manifest.to_h.keys
+    assert_equal ['stylesheets/application.css'], logical
+    fingerprinted = manifest.lookup('stylesheets/application.css')
+    assert_match(/\Astylesheets\/application-[0-9a-f]{8}\.css\z/, fingerprinted)
+    assert File.exist?(File.join(@output, fingerprinted))
+    assert File.exist?(File.join(@output, 'manifest.json'))
+  end
+
+  def test_prints_a_summary_to_the_given_output
+    out = StringIO.new
+    @cli.assets_precompile(['--source=app/assets', '--output=public/assets'], out: out)
+    assert_match(/compiled 1 file\(s\) into/, out.string)
+  end
+
+  def test_recompiling_unchanged_content_reproduces_the_same_fingerprint_and_removes_nothing_stale
+    first = @cli.assets_precompile(['--source=app/assets', '--output=public/assets'], out: StringIO.new)
+    second = @cli.assets_precompile(['--source=app/assets', '--output=public/assets'], out: StringIO.new)
+    assert_equal first.to_h, second.to_h
+  end
+
+  def test_raises_usage_error_without_required_options
+    assert_raises(Prism::Cli::UsageError) { @cli.assets_precompile([]) }
+    assert_raises(Prism::Cli::UsageError) { @cli.assets_precompile(['--source=app/assets']) }
+  end
+
+  def test_run_dispatches_the_assets_colon_precompile_command
+    original_stdout = $stdout
+    captured = StringIO.new
+    $stdout = captured
+    @cli.run(['assets:precompile', '--source=app/assets', '--output=public/assets'])
+  ensure
+    $stdout = original_stdout
+    assert_match(/compiled 1 file\(s\)/, captured.string)
+    assert File.exist?(File.join(@output, 'manifest.json'))
+  end
+end