ICU-21287 Enable asserts for 'ant checkTest'

diff --git a/icu4j/build.xml b/icu4j/build.xml
index 86ffc372a929fd29590f86126e6b51f844ab9537..9182ef44b1d2d3dc846e281c7791a7944b4d708f 100644 (file)
--- a/icu4j/build.xml
+++ b/icu4j/build.xml
@@ -267,6 +267,8 @@
             <mkdir dir="${junit.out.dir}/checkTest"/>
 
             <junit printsummary="yes" fork="yes">
+                <jvmarg value="-ea"/>
+                <jvmarg value="-Djava.awt.headless=true"/>
                 <jvmarg value="-DICU.exhaustive=10"/>
                 <classpath>
                     <path refid="junit.jars"/>