Test names are clarified

Author: sbellware

test/automated/position_store/position_stream_name.rb

@@ -19,7 +19,7 @@
 
  position_stream_name = Consumer::Postgres::PositionStore::StreamName.position_stream_name(category)
 
- test "The position category type appears only once" do
+ test "Includes the position category type only once" do
  assert(position_stream_name == category)
  end
  end
@@ -33,7 +33,7 @@
 
  control_stream_name = "#{category}:position-#{identifier}"
 
- test "Identifier is appended" do
+ test "Identifier is appended as the stream ID" do
  assert(position_stream_name == control_stream_name)
  end
  end
@@ -54,7 +54,7 @@
  end
  end
 
- context "Stream name is given" do
+ context "Stream name (with ID)" do
  stream_name = Controls::StreamName.example
 
  test "Is an error" do