Add fixture test to assert we don't allow duplicate resolver definitions

Summary: * Add a fixture asserting we don't allow duplicate resolver definitions

Reviewed By: captbaritone

Differential Revision: D44265525

fbshipit-source-id: 7022f4925fe03db6428005a7d68048e5afe069e2

compiler/crates/relay-docblock/tests/to_schema/fixtures/terse-resolver-duplicated.invalid.expected

@@ -0,0 +1,55 @@
+==================================== INPUT ====================================
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// expected-to-throw
+
+/**
+ * @RelayResolver User.favorite_page: Page
+ * @rootFragment myRootFragment
+ *
+ * The user's favorite page! They probably clicked something in the UI
+ * to tell us that it was their favorite page and then we put that in a
+ * database or something. Then we got that info out again and put it out
+ * again. Anyway, I'm rambling now. Its a page that the user likes. A lot.
+ */
+graphql`
+fragment myRootFragment on User {
+  name
+}
+`
+
+/**
+* @RelayResolver User.favorite_page: Page
+* @rootFragment myRootFragment2
+*
+* The user's favorite page! They probably clicked something in the UI
+* to tell us that it was their favorite page and then we put that in a
+* database or something. Then we got that info out again and put it out
+* again. Anyway, I'm rambling now. Its a page that the user likes. A lot.
+*/
+graphql`
+fragment myRootFragment2 on User {
+  name
+}
+`
+==================================== ERROR ====================================
+✖︎ Duplicate field definition 'favorite_page' found.
+
+  /path/to/test/fixture/terse-resolver-duplicated.invalid.js:2:23
+    1 │ *
+    2 │ * @RelayResolver User.favorite_page: Page
+      │                       ^^^^^^^^^^^^^
+    3 │ * @rootFragment myRootFragment2
+
+  ℹ︎ previously defined here
+
+  /path/to/test/fixture/terse-resolver-duplicated.invalid.js:2:24
+    1 │ *
+    2 │ * @RelayResolver User.favorite_page: Page
+      │                        ^^^^^^^^^^^^^
+    3 │ * @rootFragment myRootFragment2

compiler/crates/relay-docblock/tests/to_schema/fixtures/terse-resolver-duplicated.invalid.js

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// expected-to-throw
+
+/**
+ * @RelayResolver User.favorite_page: Page
+ * @rootFragment myRootFragment
+ *
+ * The user's favorite page! They probably clicked something in the UI
+ * to tell us that it was their favorite page and then we put that in a
+ * database or something. Then we got that info out again and put it out
+ * again. Anyway, I'm rambling now. Its a page that the user likes. A lot.
+ */
+graphql`
+fragment myRootFragment on User {
+  name
+}
+`
+
+/**
+* @RelayResolver User.favorite_page: Page
+* @rootFragment myRootFragment2
+*
+* The user's favorite page! They probably clicked something in the UI
+* to tell us that it was their favorite page and then we put that in a
+* database or something. Then we got that info out again and put it out
+* again. Anyway, I'm rambling now. Its a page that the user likes. A lot.
+*/
+graphql`
+fragment myRootFragment2 on User {
+  name
+}
+`

compiler/crates/relay-docblock/tests/to_schema_test.rs

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<8cf2bea87a87f4c48d8c0b53b4e0c616>>
+ * @generated SignedSource<<8c829590b9a20caf63439cd36a113237>>
  */
 
 mod to_schema;
@@ -243,6 +243,13 @@ fn terse_relay_resolver_with_output_type() {
     test_fixture(transform_fixture, "terse-relay-resolver-with-output-type.js", "to_schema/fixtures/terse-relay-resolver-with-output-type.expected", input, expected);
 }
 
+#[test]
+fn terse_resolver_duplicated_invalid() {
+    let input = include_str!("to_schema/fixtures/terse-resolver-duplicated.invalid.js");
+    let expected = include_str!("to_schema/fixtures/terse-resolver-duplicated.invalid.expected");
+    test_fixture(transform_fixture, "terse-resolver-duplicated.invalid.js", "to_schema/fixtures/terse-resolver-duplicated.invalid.expected", input, expected);
+}
+
 #[test]
 fn weak_type() {
     let input = include_str!("to_schema/fixtures/weak-type.js");