diff --git a/tests/a01-a02-ui-contract.ps1 b/tests/a01-a02-ui-contract.ps1
index 2be2e45..bedb761 100644
--- a/tests/a01-a02-ui-contract.ps1
+++ b/tests/a01-a02-ui-contract.ps1
@@ -88,7 +88,9 @@ foreach ($rule in @($pageRule, $paperRule, $contentRule)) {
 Assert-Contains -Content $pageRule.Groups['Body'].Value -Expected 'display: flex;' -Message 'A01 root must use flex flow.'
 Assert-Contains -Content $pageRule.Groups['Body'].Value -Expected 'flex-direction: column;' -Message 'A01 root must stack header and paper.'
 Assert-Contains -Content $pageRule.Groups['Body'].Value -Expected 'min-height: var(--app-viewport-height);' -Message 'A01 root must fill without locking content height.'
-Assert-NotContains -Content $pageRule.Groups['Body'].Value -Unexpected 'height: var(--app-viewport-height);' -Message 'A01 root must not lock content to the viewport.'
+if ($pageRule.Groups['Body'].Value -match '(?m)^\s*height:\s*var\(--app-viewport-height\);') {
+  throw 'A01 root must not lock content to the viewport.'
+}
 Assert-Contains -Content $paperRule.Groups['Body'].Value -Expected 'flex: 1;' -Message 'A01 paper must receive remaining viewport space.'
 Assert-Contains -Content $contentRule.Groups['Body'].Value -Expected 'justify-content: space-between;' -Message 'A01 must distribute spare height in normal flow.'
 Assert-NotContains -Content $contentRule.Groups['Body'].Value -Unexpected 'grid-area:' -Message 'A01 interactive content must not overlap page artwork.'