$nl
"If the test harness needs to define words, they should be placed in a vocabulary named " { $snippet { $emphasis "vocab" } ".tests" } " where " { $emphasis "vocab" } " is the vocab being tested."
{ $heading "Writing unit tests" }
-"Several worlds exist for writing different kinds of unit tests. The most general one asserts that a quotation outputs a specific set of values:"
+"Several words exist for writing different kinds of unit tests. The most general one asserts that a quotation outputs a specific set of values:"
{ $subsections POSTPONE: unit-test }
"Assert that a quotation throws an error:"
{ $subsections