Add Runtime READ test case

Author: boriel

tests/runtime/cases/read_coercion.bas

@@ -0,0 +1,48 @@
+REM Type coercion (promotion) in read DATA
+
+#include "lib/tst_framework.bas"
+INIT("Testing READ, DATA coercing")
+
+
+DIM i8 as Byte
+DIM u8 as UByte
+DIM i16 as Integer
+DIM u16 as UInteger
+DIM i32 as Long
+DIM u32 as ULong
+DIM f16 as Fixed
+DIM flt as Float
+
+RESTORE
+READ i8
+PRINT i8
+RESTORE
+READ u8
+PRINT u8
+
+RESTORE
+READ i16
+PRINT i16
+RESTORE
+READ u16
+PRINT u16
+
+RESTORE
+READ i32
+PRINT i32
+RESTORE
+READ u32
+PRINT u32
+
+RESTORE
+READ f16
+PRINT f16
+
+RESTORE
+READ flt
+PRINT flt
+
+DATA 700
+
+REPORT_OK
+