java/awt/font/MonospacedGlyphWidth/MonospacedGlyphWidthTest.java failed in a random test run

java.lang.RuntimeException: Test Failed: characters have different width!
at MonospacedGlyphWidthTest.checkChars(MonospacedGlyphWidthTest.java:55)
at MonospacedGlyphWidthTest.main(MonospacedGlyphWidthTest.java:84)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:832)

It appears to have been run on a system where the native
platform mapped IPAGothic (ipag.ttf) to be used for monospaced.

That font is a CJK font where the ascii chars are half the width
of CJK and many other characters, so the test fails.
It seems it is just too hard to be sure what you have when
a logical font is being used.