Add test cases

Author: lens0021

src/tests/validity/command_interpolation_single_apix.ab renamed to src/tests/validity/interpolation_single_quotes.ab

@@ -1,25 +1,42 @@
 // Output
-// ABC
-// c
 // '
 // ''
+// a'b
 // 'ABC'
 // a'bABCc'd
+// 'ABC
+// ABC'
+// '"a'b
+// ---
 // '
 // a'b
+// 'ABC
+// ABC'
 // a'bABCc'd
 // "ab
+// ---
+// ABC
+// c
 
 const str = "ABC"
 const space = " "
 
-trust $ printf '{str}\\n' $
-trust $ echo 'a b c d e' | cut -d'{space}' -f3 $
 echo "'"
 echo "''"
+echo "a'b"
 echo "'ABC'"
 echo "a'b{str}c'd"
+echo "'{str}"
+echo "{str}'"
+echo "'\"a'b"
+echo "---"
 trust $ echo "'" $
 trust $ echo "a'b" $
+trust $ echo "'{str}" $
+trust $ echo "{str}'" $
 trust $ echo "a'b{str}c'd" $
 trust $ echo '"a'b $
+echo "---"
+// Reallife examples
+trust $ printf '{str}\\n' $
+trust $ echo 'a b c d e' | cut -d'{space}' -f3 $