Updated the default test suite to check that argExists returns false if the default value is being used

Author: moebrowne

tests/default.sh

@@ -19,9 +19,9 @@ source ../argument-parser.sh
 [ "$(argValue "hyphenated-arg")" == "hyphenated" ] && pass || fail
 
 
-argExists "alphaArg" && pass || fail
-argExists "bravoArg" && pass || fail
-argExists "charlieArg" && pass || fail
-argExists "deltaArg" && pass || fail
-argExists "numericArg" && pass || fail
-argExists "hyphenated-arg" && pass || fail
+argExists "alphaArg" && fail || pass
+argExists "bravoArg" && fail || pass
+argExists "charlieArg" && fail || pass
+argExists "deltaArg" && fail || pass
+argExists "numericArg" && fail || pass
+argExists "hyphenated-arg" && fail || pass