Add two tests in tests-asn1c-compiler directory
diff --git a/tests/tests-asn1c-compiler/156-union-ios-OK.asn1.-EFprint-class-matrix b/tests/tests-asn1c-compiler/156-union-ios-OK.asn1.-EFprint-class-matrix
new file mode 100644
index 0000000..8d21c9f
--- /dev/null
+++ b/tests/tests-asn1c-compiler/156-union-ios-OK.asn1.-EFprint-class-matrix
@@ -0,0 +1,108 @@
+ModuleParameterizationMoreThanTwoLevel { iso org(3) dod(6) internet(1)
+ private(4) enterprise(1) spelio(9363) software(1) asn1c(5) test(1)
+ 156 }
+DEFINITIONS ::=
+BEGIN
+
+TOTAL-CLASS SAMPLE-CLASS ::= {({ IDENTIFIED BY id1-1 } | { WITH CODE 1 IDENTIFIED BY id1-2 }) ({ IDENTIFIED BY id1-1 } | { WITH CODE 1 IDENTIFIED BY id1-2 }) | ({ IDENTIFIED BY id2-1 }) ({ IDENTIFIED BY id2-1 }),...}
+-- Information Object Set has 4 entries:
+-- [ &id][ &code][ &Type]
+-- [1] id1-1 <no entry> <no entry>
+-- [2] id1-2 1 <no entry>
+-- [3] id2-2 1 <no entry>
+-- [4] id2-3 2 SampleType
+
+
+CLASS-1 SAMPLE-CLASS ::= {{ IDENTIFIED BY id1-1 } | { WITH CODE 1 IDENTIFIED BY id1-2 },...,{ TYPE SampleType WITH CODE 2 IDENTIFIED BY id1-3 }}
+-- Information Object Set has 2 entries:
+-- [ &id][&code][&Type]
+-- [1] id1-1 <no entry> <no entry>
+-- [2] id1-2 1 <no entry>
+-- [ ] ...
+
+
+CLASS-2 SAMPLE-CLASS ::= {{ IDENTIFIED BY id2-1 },...,{ WITH CODE 1 IDENTIFIED BY id2-2 } | { TYPE SampleType WITH CODE 2 IDENTIFIED BY id2-3 }}
+-- Information Object Set has 2 entries:
+-- [ &id][ &code][ &Type]
+-- [1] id2-2 1 <no entry>
+-- [2] id2-3 2 SampleType
+-- [ ] ...
+
+
+SAMPLE-CLASS ::= CLASS {
+ &id RELATIVE-OID UNIQUE,
+ &code ENUMERATED {
+ request(0),
+ response(1),
+ status(2)
+ } DEFAULT 0,
+ &Type OPTIONAL
+} WITH SYNTAX { [TYPE &Type] [WITH CODE &code] IDENTIFIED BY &id }
+
+-- Information Object Set has 6 entries:
+-- [ &id][ &code][ &Type]
+-- [1] id1-1 <no entry> <no entry>
+-- [2] id1-2 1 <no entry>
+-- [3] id2-2 1 <no entry>
+-- [4] id2-3 2 SampleType
+-- [5] id1-3 2 SampleType
+-- [6] id2-1 <no entry> <no entry>
+
+
+item1-1 SAMPLE-CLASS ::= { IDENTIFIED BY id1-1 }
+-- Information Object Set has 1 entry:
+-- [ &id][&code][&Type]
+-- [1] id1-1 <no entry> <no entry>
+
+
+item1-2 SAMPLE-CLASS ::= { WITH CODE 1 IDENTIFIED BY id1-2 }
+-- Information Object Set has 1 entry:
+-- [ &id][&code][&Type]
+-- [1] id1-2 1 <no entry>
+
+
+item1-3 SAMPLE-CLASS ::= { TYPE SampleType WITH CODE 2 IDENTIFIED BY id1-3 }
+-- Information Object Set has 1 entry:
+-- [ &id][ &code][ &Type]
+-- [1] id1-3 2 SampleType
+
+
+item2-1 SAMPLE-CLASS ::= { IDENTIFIED BY id2-1 }
+-- Information Object Set has 1 entry:
+-- [ &id][&code][&Type]
+-- [1] id2-1 <no entry> <no entry>
+
+
+item2-2 SAMPLE-CLASS ::= { WITH CODE 1 IDENTIFIED BY id2-2 }
+-- Information Object Set has 1 entry:
+-- [ &id][&code][&Type]
+-- [1] id2-2 1 <no entry>
+
+
+item2-3 SAMPLE-CLASS ::= { TYPE SampleType WITH CODE 2 IDENTIFIED BY id2-3 }
+-- Information Object Set has 1 entry:
+-- [ &id][ &code][ &Type]
+-- [1] id2-3 2 SampleType
+
+
+id1-1 RELATIVE-OID ::= { 1 1 }
+
+id1-2 RELATIVE-OID ::= { 1 2 }
+
+id1-3 RELATIVE-OID ::= { 1 3 }
+
+id2-1 RELATIVE-OID ::= { 2 1 }
+
+id2-2 RELATIVE-OID ::= { 2 2 }
+
+id2-3 RELATIVE-OID ::= { 2 3 }
+
+SampleType ::= SEQUENCE {
+ ...
+}
+
+Salt ::= SET {
+ ...
+}
+
+END