Support for required options

This commit introduces support for required options,
which are options that cause the parser to raise
a `MissingRequiredOption` exception if not present.

Options can be marked as required by passing
`required: true` in their configuration, and any errors
caused by missing required options can be suppressed via
`suppress_errors: true`.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/error_test.rb b/test/error_test.rb
index 2f7730b..d9c71ab 100644
--- a/test/error_test.rb
+++ b/test/error_test.rb
@@ -49,3 +49,17 @@ describe Slop::UnknownOption do
     opts.parse %w(--foo)
   end
 end
+
+describe Slop::MissingRequiredOption do
+  it "raises when a required option is missing" do
+    opts = Slop::Options.new
+    opts.string "-n", "--name", required: true
+    assert_raises(Slop::MissingRequiredOption) { opts.parse [] }
+  end
+
+  it "does not raise when errors are suppressed" do
+    opts = Slop::Options.new(suppress_errors: true)
+    opts.string "-n", "--name", required: true
+    opts.parse []
+  end
+end