From 97abc8b05d6d1f768a7c04f7dd56544bd82ead35 Mon Sep 17 00:00:00 2001
From: buty4649 <buty4649@gmail.com>
Date: Sat, 3 Jun 2023 12:49:03 +0900
Subject: [PATCH] wip

---
 spec/special_variables_spec.rb | 36 ++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 spec/special_variables_spec.rb

diff --git a/spec/special_variables_spec.rb b/spec/special_variables_spec.rb
new file mode 100644
index 0000000..f13c491
--- /dev/null
+++ b/spec/special_variables_spec.rb
@@ -0,0 +1,36 @@
+describe 'Special Variables' do
+  describe '$_' do
+    let(:input) { 'foo' }
+    let(:output) { input }
+
+    before { run_rf('-q "puts $_"', input) }
+
+    it { expect(last_command_started).to be_successfully_executed }
+    it { expect(last_command_started).to have_output output_string_eq output }
+  end
+
+  describe '_' do
+    let(:input) { 'foo' }
+    let(:output) { input }
+
+    before { run_rf('-q "puts _"', input) }
+
+    it { expect(last_command_started).to be_successfully_executed }
+    it { expect(last_command_started).to have_output output_string_eq output }
+  end
+
+  describe '$F' do
+    let(:input) { 'foo bar baz' }
+    let(:output) do
+      <<~OUTPUT
+        Array
+        3
+      OUTPUT
+    end
+
+    before { run_rf('-q "puts $F.class,$F.size"', input) }
+
+    it { expect(last_command_started).to be_successfully_executed }
+    it { expect(last_command_started).to have_output output_string_eq output }
+  end
+end