Check in the pristine copy of ICU 4.6...

icu46/source/test/testdata/test1bmp.ucm

Index: icu46/source/test/testdata/test1bmp.ucm
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--- icu46/source/test/testdata/test1bmp.ucm	(revision 0)
+++ icu46/source/test/testdata/test1bmp.ucm	(revision 0)
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+# *******************************************************************************
+# * Copyright (C) 2007-2009, International Business Machines
+# * Corporation and others.  All Rights Reserved.
+# *******************************************************************************
+#
+# test1.ucm
+#
+# Test file for MBCS conversion with single-byte codepage data.
+# BMP-only, to test optimized code path.
+# Includes extensions.
+
+<code_set_name>     "test1bmp"
+<mb_cur_max>        1
+<mb_cur_min>        1
+<uconv_class>       "MBCS"
+<subchar>           \xff
+<icu:state>         0, 5-9, c:0.s, ff
+
+CHARMAP
+
+# fromUnicode result is zero byte from other than U+0000
+<U0040>     \x00 |0
+<U0061>     \x00 |1
+
+# nothing special
+<U0065>     \x05 |0
+
+# toUnicode result is fallback direct
+<U0066>     \x06 |3
+
+#unassigned \x09
+
+# 1:2 mapping
+<U0074>     \x07\x09 |0
+
+# 2:1 mapping
+<U0075><U0076> \x08 |0
+
+END CHARMAP