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diff --git a/unit-tests/test/script/lexer/variable.testscript b/unit-tests/test/script/lexer/variable.testscript
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+# file : unit-tests/test/script/lexer/variable.testscript
+# copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+# license : MIT; see accompanying LICENSE file
+
+# Test handling custom variable names ($*, $~, $NN).
+#
+test.arguments = variable
+
+: command
+:
+{
+ : only
+ :
+ $* <"*" >>EOO
+ '*'
+ <newline>
+ EOO
+
+ : followed
+ :
+ $* <"*abc" >>EOO
+ '*'
+ 'abc'
+ <newline>
+ EOO
+}
+
+: working-dir
+:
+{
+ : only
+ :
+ $* <"~" >>EOO
+ '~'
+ <newline>
+ EOO
+
+ : followed
+ :
+ $* <"~123" >>EOO
+ '~'
+ '123'
+ <newline>
+ EOO
+}
+
+: arg
+:
+{
+ : only
+ :
+ $* <"0" >>EOO
+ '0'
+ <newline>
+ EOO
+
+ : followed
+ :
+ $* <"1abc" >>EOO
+ '1'
+ 'abc'
+ <newline>
+ EOO
+
+ : multi-digit
+ :
+ $* <"10" 2>>EOE != 0
+ stdin:1:1: error: multi-digit special variable name
+ EOE
+}