1 files changed, 31 insertions, 0 deletions
diff --git a/tools/cldr-code/src/test/java/org/unicode/cldr/util/TestVersionNumbers.java b/tools/cldr-code/src/test/java/org/unicode/cldr/util/TestVersionNumbers.java
new file mode 100644
index 00000000..e8479944
--- /dev/null
+++ b/tools/cldr-code/src/test/java/org/unicode/cldr/util/TestVersionNumbers.java
@@ -0,0 +1,31 @@
+package org.unicode.cldr.util;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.ibm.icu.util.VersionInfo;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.TreeMap;
+import org.junit.jupiter.api.Test;
+import org.unicode.cldr.tool.CldrVersion;
+import org.unicode.cldr.tool.ToolConstants;
+
+public class TestVersionNumbers {
+    @Test
+    public void TestAllVersionNumbers() {
+        SupplementalDataInfo sdi = SupplementalDataInfo.getInstance();
+
+        final Map<String, VersionInfo> m = new TreeMap<>();
+        m.put(
+                "SupplementalDataInfo.getCldrVersion(), from ldmlSupplemental.dtd",
+                sdi.getCldrVersion());
+        m.put("CLDRFile.GEN_VERSION", VersionInfo.getInstance(CLDRFile.GEN_VERSION));
+        m.put("CldrVersion.baseline", CldrVersion.baseline.getVersionInfo());
+        m.put("ToolConstants.DEV_VERSION", VersionInfo.getInstance(ToolConstants.DEV_VERSION));
+
+        assertEquals(
+                1,
+                new HashSet<VersionInfo>(m.values()).size(),
+                () -> "All versions should be identical, but got: " + m.toString());
+    }
+}