t27 basics 10: a test block, passing and failing

A t27 test block and the report it gives when it passes and when an assert is false. Lesson 10 of the t27 basics course.

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Where the numbers come from

The lesson spec public/t27/files/specs/basics/10_a_test_block.t27, compiled clean on 7 backends by public/t27/t27_compiler.wasm, whose tests pass in the site test runner
Compiler verdicts, error lines, code and counts quoted on this page are what the same wasm answered in node 22 when the course was authored; words without a run behind them are said to be read, not run