properly test trailing colons fix

[coveralls]

Pull Request Test Coverage Report for Build 7557581279

• 2 of 3 (66.67%) changed or added relevant lines in 2 files are covered.
• 20 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.1%) to 97.297%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/modes/x.ts	0	1	0.0%
<!--	Total:	2	3	66.67%	-->

Files with Coverage Reduction	New Missed Lines	%
src/modes/shellcode.ts	2	82.61%
src/modes/integrate.ts	3	94.23%
src/prefab/construct-env.ts	5	96.25%
src/utils/execve.ts	10	92.55%
<!--	Total:	20		-->

Totals
Change from base Build 7547752858:	-0.1%
Covered Lines:	1433
Relevant Lines:	1464

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💛 - Coveralls