Apply suggestions from code review

Co-authored-by: Owen Mansel-Chan <62447351+owen-mc@users.noreply.github.com>

Author: Alvaro Muñoz

go/ql/test/library-tests/semmle/go/frameworks/gqlgen/gqlgen.ql

@@ -1,4 +1,18 @@
 import go
+import TestUtilities.InlineExpectationsTest
 
-from Gqlgen::ResolverParameter p
-select p
+module UntrustedFlowSourceTest implements TestSig {
+  string getARelevantTag() { result = "resolverParameter" }
+
+  predicate hasActualResult(Location location, string element, string tag, string value) {
+    tag = "resolverParameter" and
+    exists(Gqlgen::ResolverParameter p |
+      element = p.toString() and
+      value = "\"" + p.toString() + "\"" and
+      p.hasLocationInfo(location.getFile().getAbsolutePath(), location.getStartLine(),
+        location.getStartColumn(), location.getEndLine(), location.getEndColumn())
+    )
+  }
+}
+
+import MakeTest<UntrustedFlowSourceTest>