Split const command out into separate file (#9445)

tests/commands/const.rb

@@ -0,0 +1,25 @@
+require 'minitest/autorun'
+require_relative '../../commands/const'
+
+class ConstCommandTest < Minitest::Test
+  def test_no_arguments
+    expected_output = 'CREW_FNO_LTO_LDFLAGS=-fno-lto'
+    assert_output(/#{Regexp.escape(expected_output)}/, nil) do
+      Command.const(nil)
+    end
+  end
+
+  def test_valid_constant
+    expected_output = "CREW_FNO_LTO_LDFLAGS=-fno-lto\n"
+    assert_output expected_output, nil do
+      Command.const('CREW_FNO_LTO_LDFLAGS')
+    end
+  end
+
+  def test_invalid_constant
+    expected_output = "Constant INVALID not found\n"
+    assert_output expected_output, nil do
+      Command.const('INVALID')
+    end
+  end
+end