Add specs for xProcess#write

spec/aruba/processes/in_process_spec.rb

@@ -29,6 +29,16 @@ def execute!
     end
   end
 
+  let(:stdin_runner) do
+    Class.new(base_runner) do
+      def execute!
+        @stdin.rewind
+        item = @stdin.gets.to_s.chomp
+        @stdout.puts "Hello, #{item}!"
+      end
+    end
+  end
+
   let(:failed_runner) do
     Class.new(base_runner) do
       def execute!
@@ -141,4 +151,22 @@ def run_process(&block)
         .to raise_error(TypeError, "no implicit conversion of String into Integer")
     end
   end
+
+  describe '#write' do
+    let(:main_class) { stdin_runner }
+
+    it 'writes single strings to the process' do
+      process.write "World"
+      process.start
+      process.stop
+      expect(process.stdout).to eq "Hello, World!\n"
+    end
+
+    it 'writes multiple strings to the process' do
+      process.write "Wor", "ld"
+      process.start
+      process.stop
+      expect(process.stdout).to eq "Hello, World!\n"
+    end
+  end
 end

spec/aruba/processes/spawn_process_spec.rb

@@ -45,6 +45,26 @@
     end
   end
 
+  describe '#write' do
+    let(:command_line) { "ruby -e 'puts gets'" }
+
+    it 'writes single strings to the process' do
+      process.start
+      process.write "hello\n"
+      process.stop
+
+      expect(process.stdout).to eq "hello\n"
+    end
+
+    it 'writes multiple strings to the process' do
+      process.start
+      process.write "hel", "lo\n"
+      process.stop
+
+      expect(process.stdout).to eq "hello\n"
+    end
+  end
+
   describe "#stop" do
     before { process.start }