add a few examples

Author: schnittchen

spec/folding/basic_spec.rb

@@ -12,6 +12,47 @@ def self.it_folds_lines(content, lines, tags = nil)
   it_folds_lines(<<~EOF, 2)
   defmodule M do
   end
+  "not in fold"
+  EOF
+
+  it_folds_lines(<<~EOF, 4)
+  defmodule M do
+    def some_func do
+    end
+  end
+  "not in fold"
+  EOF
+
+  it_folds_lines(<<~EOF, 2, on_line: 2)
+  defmodule M do
+    def some_func do
+    end
+  end
+  "not in fold"
+  EOF
+
+  it_folds_lines(<<~EOF, 2)
+  if true do
+  end
+  "not in fold"
+  EOF
+
+  it_folds_lines(<<~EOF, 3, on_line: 3)
+  if true do
+    nil
+  else
+    nil
+  end
+  "not in fold"
+  EOF
+
+  it_folds_lines(<<~EOF, 5, skip: "broken")
+  if true do
+    nil
+  else
+    nil
+  end
+  "not in fold"
   EOF
 end