util.dbuffer: Simplify test case

An earlier theory involved the bug being related to collapsing multiple
items, so it exercised that too.

Also correct the comment, it referred to the space in "hello world" in
an earlier version before the test string was changed to "foobar", which
was what was tested in a REPL

1 files changed, 2 insertions, 3 deletions

diff --git a/spec/util_dbuffer_spec.lua b/spec/util_dbuffer_spec.lua
index 554a7e54..af404042 100644
--- a/spec/util_dbuffer_spec.lua
+++ b/spec/util_dbuffer_spec.lua
@@ -69,10 +69,9 @@ describe("util.dbuffer", function ()
 
 		it("works after discard", function ()
 			local b = dbuffer.new(256);
-			assert.truthy(b:write("foo"));
-			assert.truthy(b:write("bar"));
+			assert.truthy(b:write("foobar"));
 			assert.equals("foobar", b:sub(1, 6));
-			assert.truthy(b:discard(3)) -- until the space
+			assert.truthy(b:discard(3)); -- consume "foo"
 			assert.equals("bar", b:sub(1, 3));
 		end);