Check in the pristine copy of ICU 4.6...

icu46/source/test/testdata/test1.ucm

Index: icu46/source/test/testdata/test1.ucm
===================================================================
--- icu46/source/test/testdata/test1.ucm	(revision 0)
+++ icu46/source/test/testdata/test1.ucm	(revision 0)
@@ -0,0 +1,35 @@
+# *******************************************************************************
+# * Copyright (C) 2001-2009, International Business Machines
+# * Corporation and others.  All Rights Reserved.
+# *******************************************************************************
+#
+# test1.ucm
+#
+# Test file for MBCS conversion with single-byte codepage data.
+
+<code_set_name>     "test1"
+<mb_cur_max>        1
+<mb_cur_min>        1
+<uconv_class>       "MBCS"
+<subchar>           \xff
+<icu:state>         0, 5-9, a:0.s, ff
+
+CHARMAP
+
+# fromUnicode result is zero byte from other than U+0000
+<U20ac>     \x00 |0
+<U20ad>     \x00 |1
+
+# nothing special
+<U0005>     \x05 |0
+
+# toUnicode result is fallback direct
+<U0006>     \x06 |3
+
+# toUnicode result is direct non-BMP code point
+<U101234>   \x07 |0
+<Ufebcd>    \x08 |1
+
+#unassigned \x09
+
+END CHARMAP