1 files changed, 39 insertions, 0 deletions
diff --git a/test/mkmf/test_configuration.rb b/test/mkmf/test_configuration.rb
new file mode 100644
index 0000000000..0261f78a01
--- /dev/null
+++ b/test/mkmf/test_configuration.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: false
+require_relative 'base'
+
+class TestMkmfConfiguration < TestMkmf
+  def test_verbose_with_rbconfig_verbose_disabled
+    makefile = mkmf do
+      self.class::CONFIG['MKMF_VERBOSE'] = "0"
+      init_mkmf(self.class::CONFIG)
+      configuration '.'
+    end
+    verbose = makefile.grep(/^V =/).first[/^V = (.)$/, 1]
+
+    assert_equal "0", verbose
+  end
+
+  def test_verbose_with_rbconfig_verbose_enabled
+    makefile = mkmf do
+      self.class::CONFIG['MKMF_VERBOSE'] = "1"
+      init_mkmf(self.class::CONFIG)
+      configuration '.'
+    end
+    verbose = makefile.grep(/^V =/).first[/^V = (.)$/, 1]
+
+    assert_equal "1", verbose
+  end
+
+  def test_verbose_with_arg
+    assert_separately([], %w[--with-verbose], <<-'end;')
+      makefile = mkmf do
+        self.class::CONFIG['MKMF_VERBOSE'] = "0"
+        init_mkmf(self.class::CONFIG)
+        configuration '.'
+      end
+      verbose = makefile.grep(/^V =/).first[/^V = (.)$/, 1]
+
+      assert_equal "1", verbose
+    end;
+  end
+end