Add tests for supporting Iterable collections across the lib (#2847)

Author: IvanGoncharov

src/execution/__tests__/lists-test.js

@@ -37,8 +37,8 @@ describe('Execute: Accepts any iterable as list value', () => {
   });
 
   it('Accepts function arguments as a List value', () => {
-    function getArgs(...args: Array<string>) {
-      return args;
+    function getArgs(..._args: Array<string>) {
+      return arguments;
     }
     const listField = getArgs('one', 'two');
 

src/utilities/__tests__/astFromValue-test.js

@@ -293,6 +293,23 @@ describe('astFromValue', () => {
         { kind: 'EnumValue', value: 'GOODBYE' },
       ],
     });
+
+    function* listGenerator() {
+      yield 1;
+      yield 2;
+      yield 3;
+    }
+
+    expect(
+      astFromValue(listGenerator(), new GraphQLList(GraphQLInt)),
+    ).to.deep.equal({
+      kind: 'ListValue',
+      values: [
+        { kind: 'IntValue', value: '1' },
+        { kind: 'IntValue', value: '2' },
+        { kind: 'IntValue', value: '3' },
+      ],
+    });
   });
 
   it('converts list singletons', () => {

src/utilities/__tests__/coerceInputValue-test.js

@@ -303,6 +303,17 @@ describe('coerceInputValue', () => {
       expectValue(result).to.deep.equal([1, 2, 3]);
     });
 
+    it('returns no error for a valid iterable input', () => {
+      function* listGenerator() {
+        yield 1;
+        yield 2;
+        yield 3;
+      }
+
+      const result = coerceValue(listGenerator(), TestList);
+      expectValue(result).to.deep.equal([1, 2, 3]);
+    });
+
     it('returns an error for an invalid input', () => {
       const result = coerceValue([1, 'b', true, 4], TestList);
       expectErrors(result).to.deep.equal([