Jan: Created page with "== Assert == A runtime assertion library , built on top of LogicLib. == Usage == Binary assertions (works with all LogicLib operators): ${Assert} $R0 == "expected" "values match" ${Assert} $R0 != "" "not empty" ${Assert} $R0 ${StartsWith} "Hello" "starts with Hello" ${Assert} $R0 ${Contains} "world" "contains world" Negated assertions: ${AssertNot} $R0 == "bad" "must not be bad" ${Assert..."

2026-02-27T23:47:14Z

Created page with "== Assert == A runtime assertion library , built on top of LogicLib. == Usage == Binary assertions (works with all LogicLib operators): ${Assert} $R0 == "expected" "values match" ${Assert} $R0 != "" "not empty" ${Assert} $R0 ${StartsWith} "Hello" "starts with Hello" ${Assert} $R0 ${Contains} "world" "contains world" Negated assertions: ${AssertNot} $R0 == "bad" "must not be bad" ${Assert..."

New page

== Assert ==

A runtime assertion library , built on top of LogicLib.

== Usage ==
Binary assertions (works with all LogicLib operators):

${Assert} $R0 == "expected" "values match"
${Assert} $R0 != "" "not empty"
${Assert} $R0 ${StartsWith} "Hello" "starts with Hello"
${Assert} $R0 ${Contains} "world" "contains world"

Negated assertions:

${AssertNot} $R0 == "bad" "must not be bad"
${AssertNot} $R0 ${Contains} "error" "no errors"

Unary assertions (prefix-style LogicLib operators):

${Assert} ${FileExists} "$INSTDIR\app.exe" "app installed"
${AssertNot} ${FileExists} "$TEMP\leftover" "no leftovers"

Summary (prints totals, sets ErrorLevel 1 on failure):

${AssertSummary}

Compile-time assertions:

${AssertDefined} MY_VERSION
${AssertUndefined} DEPRECATED_FLAG

Verbosity:

Define <code>__ASSERT_VERBOSITY__</code> before including <code>Assert.nsh</code>.
0 = silent, 1 = errors only, 2 = all results (default)

!define __ASSERT_VERBOSITY__ 1
!include "Assert.nsh"

Fail-fast:

Define <code>__ASSERT_FAILFAST__</code> to abort the installer on the first
failure. Sets ErrorLevel 1 before calling <code>Abort</code>.

!define __ASSERT_FAILFAST__
!include "Assert.nsh"

== Links ==
* [https://github.com/idleberg/nsis-assert GitHub]

[[Category:Plugins]]

Assert - Revision history