Add nested nullable test in VariablesInAllowedPositions test

Author: leebyron

src/validation/__tests__/VariablesInAllowedPosition-test.js

@@ -360,4 +360,25 @@ describe('Validate: Variables are in allowed positions', () => {
       ],
     );
   });
+
+  it('[String] => [String!]', () => {
+    expectFailsRule(
+      VariablesInAllowedPosition,
+      `
+      query Query($stringListVar: [String])
+      {
+        complicatedArgs {
+          stringListNonNullArgField(stringListNonNullArg: $stringListVar)
+        }
+      }
+    `,
+      [
+        {
+          message: badVarPosMessage('stringListVar', '[String]', '[String!]'),
+          locations: [{ line: 2, column: 19 }, { line: 5, column: 59 }],
+          path: undefined,
+        },
+      ],
+    );
+  });
 });

src/validation/__tests__/harness.js

@@ -228,6 +228,14 @@ const ComplicatedArgs = new GraphQLObjectType({
       type: GraphQLString,
       args: { stringListArg: { type: GraphQLList(GraphQLString) } },
     },
+    stringListNonNullArgField: {
+      type: GraphQLString,
+      args: {
+        stringListNonNullArg: {
+          type: GraphQLList(GraphQLNonNull(GraphQLString)),
+        },
+      },
+    },
     complexArgField: {
       type: GraphQLString,
       args: { complexArg: { type: ComplexInput } },