feat: add cross-language Spector tests for dollar-sign query params and discriminator without subtypes

.chronus/changes/feat-cross-language-spector-tests-2026-4-29-13-38-16.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/http-specs"
+---
+
+add test for discriminator model without subtypes and query params with `$` prefixes

packages/http-specs/spec-summary.md

@@ -1534,6 +1534,43 @@ Second request path:
 
 Expect to handle a constant value for query and mock api returns nothing
 
+### Parameters_Query_DollarSign_filter
+
+- Endpoint: `get /parameters/query/dollar-sign/filter`
+
+Send a request with a `$filter` query parameter.
+
+Expected query parameter:
+
+- `$filter` = "status eq 'active'"
+
+Expected response status code: 204
+
+### Parameters_Query_DollarSign_orderby
+
+- Endpoint: `get /parameters/query/dollar-sign/orderby`
+
+Send a request with a `$orderby` query parameter.
+
+Expected query parameter:
+
+- `$orderby` = "name asc"
+
+Expected response status code: 204
+
+### Parameters_Query_DollarSign_topAndSkip
+
+- Endpoint: `get /parameters/query/dollar-sign/top-and-skip`
+
+Send a request with `$top` and `$skip` query parameters.
+
+Expected query parameters:
+
+- `$top` = 10
+- `$skip` = 5
+
+Expected response status code: 204
+
 ### Parameters_Spread_Alias_spreadAsRequestBody
 
 - Endpoint: `put /parameters/spread/alias/request-body`
@@ -6226,6 +6263,18 @@ Expected response body:
 { "wingspan": 1, "kind": "sparrow" }
 ```
 
+### Type_Model_Inheritance_SingleDiscriminator_getNoSubtypesModel
+
+- Endpoint: `get /type/model/inheritance/single-discriminator/no-subtypes/model`
+
+Generate and receive a discriminated model that has no defined subtypes.
+The base model declares a discriminator but no models extend it.
+Expected response body:
+
+```json
+{ "kind": "salmon", "size": 10 }
+```
+
 ### Type_Model_Inheritance_SingleDiscriminator_getRecursiveModel
 
 - Endpoint: `get /type/model/inheritance/single-discriminator/recursivemodel`
@@ -6278,6 +6327,17 @@ Expected input body:
 { "wingspan": 1, "kind": "sparrow" }
 ```
 
+### Type_Model_Inheritance_SingleDiscriminator_putNoSubtypesModel
+
+- Endpoint: `put /type/model/inheritance/single-discriminator/no-subtypes/model`
+
+Send a discriminated model that has no defined subtypes.
+Expected input body:
+
+```json
+{ "kind": "salmon", "size": 10 }
+```
+
 ### Type_Model_Inheritance_SingleDiscriminator_putRecursiveModel
 
 - Endpoint: `put /type/model/inheritance/single-discriminator/recursivemodel`

packages/http-specs/specs/parameters/query/main.tsp

@@ -20,3 +20,59 @@ interface Constant {
     queryParam: "constantValue",
   ): void;
 }
+
+@doc("Dollar-sign prefixed query parameter verification")
+@route("/dollar-sign")
+interface DollarSign {
+  @scenario
+  @scenarioDoc("""
+    Send a request with a `$filter` query parameter.
+
+    Expected query parameter:
+    - `$filter` = "status eq 'active'"
+
+    Expected response status code: 204
+    """)
+  @route("/filter")
+  @get
+  filter(
+    @query("$filter")
+    filter: string,
+  ): void;
+
+  @scenario
+  @scenarioDoc("""
+    Send a request with `$top` and `$skip` query parameters.
+
+    Expected query parameters:
+    - `$top` = 10
+    - `$skip` = 5
+
+    Expected response status code: 204
+    """)
+  @route("/top-and-skip")
+  @get
+  topAndSkip(
+    @query("$top")
+    top: int32,
+
+    @query("$skip")
+    skip: int32,
+  ): void;
+
+  @scenario
+  @scenarioDoc("""
+    Send a request with a `$orderby` query parameter.
+
+    Expected query parameter:
+    - `$orderby` = "name asc"
+
+    Expected response status code: 204
+    """)
+  @route("/orderby")
+  @get
+  orderby(
+    @query("$orderby")
+    orderby: string,
+  ): void;
+}

packages/http-specs/specs/parameters/query/mockapi.ts

@@ -13,3 +13,39 @@ Scenarios.Parameters_Query_Constant_post = passOnSuccess({
   },
   kind: "MockApiDefinition",
 });
+
+Scenarios.Parameters_Query_DollarSign_filter = passOnSuccess({
+  uri: "/parameters/query/dollar-sign/filter",
+  method: "get",
+  request: {
+    query: { $filter: "status eq 'active'" },
+  },
+  response: {
+    status: 204,
+  },
+  kind: "MockApiDefinition",
+});
+
+Scenarios.Parameters_Query_DollarSign_topAndSkip = passOnSuccess({
+  uri: "/parameters/query/dollar-sign/top-and-skip",
+  method: "get",
+  request: {
+    query: { $top: "10", $skip: "5" },
+  },
+  response: {
+    status: 204,
+  },
+  kind: "MockApiDefinition",
+});
+
+Scenarios.Parameters_Query_DollarSign_orderby = passOnSuccess({
+  uri: "/parameters/query/dollar-sign/orderby",
+  method: "get",
+  request: {
+    query: { $orderby: "name asc" },
+  },
+  response: {
+    status: 204,
+  },
+  kind: "MockApiDefinition",
+});

packages/http-specs/specs/type/model/inheritance/single-discriminator/main.tsp

@@ -49,6 +49,13 @@ model TRex extends Dinosaur {
   kind: "t-rex";
 }
 
+@doc("A discriminated model with no defined subtypes. The discriminator is declared but no models extend it.")
+@discriminator("kind")
+model Fish {
+  kind: string;
+  size: int32;
+}
+
 @scenario
 @route("/model")
 @scenarioDoc("""
@@ -170,3 +177,28 @@ op getWrongDiscriminator(): Bird;
   """)
 @get
 op getLegacyModel(): Dinosaur;
+
+@scenario
+@route("/no-subtypes/model")
+@scenarioDoc("""
+  Generate and receive a discriminated model that has no defined subtypes.
+  The base model declares a discriminator but no models extend it.
+  Expected response body:
+  ```json
+  {"kind": "salmon", "size": 10}
+  ```
+  """)
+@get
+op getNoSubtypesModel(): Fish;
+
+@scenario
+@route("/no-subtypes/model")
+@scenarioDoc("""
+  Send a discriminated model that has no defined subtypes.
+  Expected input body:
+  ```json
+  {"kind": "salmon", "size": 10}
+  ```
+  """)
+@put
+op putNoSubtypesModel(@body input: Fish): NoContentResponse;

packages/http-specs/specs/type/model/inheritance/single-discriminator/mockapi.ts

@@ -101,3 +101,31 @@ Scenarios.Type_Model_Inheritance_SingleDiscriminator_getLegacyModel = passOnSucc
   },
   kind: "MockApiDefinition",
 });
+
+const noSubtypesBody = {
+  kind: "salmon",
+  size: 10,
+};
+
+Scenarios.Type_Model_Inheritance_SingleDiscriminator_getNoSubtypesModel = passOnSuccess({
+  uri: "/type/model/inheritance/single-discriminator/no-subtypes/model",
+  method: "get",
+  request: {},
+  response: {
+    status: 200,
+    body: json(noSubtypesBody),
+  },
+  kind: "MockApiDefinition",
+});
+
+Scenarios.Type_Model_Inheritance_SingleDiscriminator_putNoSubtypesModel = passOnSuccess({
+  uri: "/type/model/inheritance/single-discriminator/no-subtypes/model",
+  method: "put",
+  request: {
+    body: json(noSubtypesBody),
+  },
+  response: {
+    status: 204,
+  },
+  kind: "MockApiDefinition",
+});