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Update unit_testing_rules.md

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Update the shorthand, and note the different behaviour between missing samples and numbers.

Signed-off-by: Danny Staple <danny@orionrobots.co.uk>
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docs/configuration/unit_testing_rules.md
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@ -86,7 +86,8 @@ series: <string>
# Examples: # Examples:
# 1. '-2+4x3' becomes '-2 2 6 10' - series starts at -2, then 3 further samples incrementing by 4. # 1. '-2+4x3' becomes '-2 2 6 10' - series starts at -2, then 3 further samples incrementing by 4.
# 2. ' 1-2x4' becomes '1 -1 -3 -5 -7' - series starts at 1, then 4 further samples decrementing by 2. # 2. ' 1-2x4' becomes '1 -1 -3 -5 -7' - series starts at 1, then 4 further samples decrementing by 2.
# 3. ' 1 _x3 stale' becomes '1 _ _ _ stale' # 3. ' 1x4' become '1 1 1 1' - shorthand for '1+0x4', series starts at 1, then 3 further samples incrementing by 0.
# 4. ' 1 _x3 stale' becomes '1 _ _ _ stale' - the missing sample cannot increment, so only 3 samples are produced by the '_x3' expression.
values: <string> values: <string>
``` ```