Index: trunk/test/unit/org/openstreetmap/josm/tools/UtilsTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/tools/UtilsTest.java	(revision 19592)
+++ trunk/test/unit/org/openstreetmap/josm/tools/UtilsTest.java	(revision 19609)
@@ -524,5 +524,9 @@
     @Test
     void testExecOutput() throws Exception {
-        final String output = Utils.execOutput(Arrays.asList("echo", "Hello", "World"));
+        // "echo" is a shell builtin on Windows, not a standalone executable ProcessBuilder can find.
+        final List<String> command = PlatformManager.isPlatformWindows()
+                ? Arrays.asList("cmd", "/c", "echo", "Hello", "World")
+                : Arrays.asList("echo", "Hello", "World");
+        final String output = Utils.execOutput(command);
         assertEquals("Hello World", output);
     }