diff --git a/platform/platform-tests/testSrc/com/intellij/wm/WindowInfoTest.kt b/platform/platform-tests/testSrc/com/intellij/wm/WindowInfoTest.kt
index b17d2b05a03d..c9e7aad0f668 100644
--- a/platform/platform-tests/testSrc/com/intellij/wm/WindowInfoTest.kt
+++ b/platform/platform-tests/testSrc/com/intellij/wm/WindowInfoTest.kt
@@ -53,6 +53,8 @@ internal class WindowInfoTest {
     val a = WindowInfoImpl()
     a.id = "a"
     a.weight = 0.3f
+    doSerializerTest("""<window_info id="a" weight="0.3" />""", a)
+    a.weight = WindowInfoImpl.DEFAULT_WEIGHT
     doSerializerTest("""<window_info id="a" />""", a)
   }
 }
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