Cover cmdlineTests.sh errors

test/libsolidity/syntaxTests/imports/declaration_not_found.sol

@@ -0,0 +1,7 @@
+==== Source: a ====
+contract A { }
+==== Source: b ====
+import {C} from "a";
+contract B { }
+// ----
+// DeclarationError 2904: (b:0-20): Declaration "C" not found in "a" (referenced as "a").

test/libsolidity/syntaxTests/unexpected.sol

@@ -0,0 +1,3 @@
+unexpected
+// ----
+// ParserError 7858: (0-10): Expected pragma, import directive or contract/interface/library/struct/enum definition.