diff --git a/test/repl.coffee b/test/repl.coffee
index 25877cee..b48def74 100644
--- a/test/repl.coffee
+++ b/test/repl.coffee
@@ -80,3 +80,14 @@ testRepl "evaluates multiline", (input, output) ->
   input.emitLine '  1 + 1'
   input.emit 'keypress', null, ctrlV
   eq '2', output.lastWrite()
+
+testRepl "variables in scope are preserved", (input, output) ->
+  input.emitLine 'a = 1'
+  input.emitLine 'do -> a = 2'
+  input.emitLine 'a'
+  eq '2', output.lastWrite()
+
+testRepl "existencial assignment of previously declared variable", (input, output) ->
+  input.emitLine 'a = null'
+  input.emitLine 'a ?= 42'
+  eq '42', output.lastWrite()
\ No newline at end of file