[Specs] add case for constant query

.chronus/changes/HEAD-2025-9-23-17-13-14.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/http-specs"
+---
+
+Add case for constant query

packages/http-specs/spec-summary.md

@@ -7545,6 +7545,12 @@ Expect to handle a boolean value. Mock api will return true
 
 Expect to send a boolean value. Mock api expect to receive 'true'
 
+### Type_Scalar_ConstantQuery_post
+
+- Endpoint: `post /type/scalar/constant-query`
+
+Expect to handle a constant value for query and mock api returns nothing
+
 ### Type_Scalar_Decimal128Type_requestBody
 
 - Endpoint: `put /type/scalar/decimal128/resquest_body`

packages/http-specs/specs/type/scalar/main.tsp

@@ -183,3 +183,17 @@ interface DecimalVerify extends NumberTypesVerifyOperations<decimal, "[0.1, 0.1,
 @doc("Decimal128 type verification")
 @route("/decimal128")
 interface Decimal128Verify extends NumberTypesVerifyOperations<decimal, "[0.1, 0.1, 0.1]", "0.3"> {}
+
+@doc("Constant query parameter verification")
+@route("/constant-query")
+interface ConstantQuery {
+  #suppress "@azure-tools/typespec-azure-core/use-standard-operations" "For testing"
+  @scenario
+  @scenarioDoc("Expect to handle a constant value for query and mock api returns nothing")
+  @post
+  @doc("post constant query value")
+  post(
+    @query
+    queryParam: "constantValue",
+  ): void;
+}

packages/http-specs/specs/type/scalar/mockapi.ts

@@ -197,3 +197,15 @@ Scenarios.Type_Scalar_Decimal128Verify_verify = passOnSuccess({
   },
   kind: "MockApiDefinition",
 });
+
+Scenarios.Type_Scalar_ConstantQuery_post = passOnSuccess({
+  uri: "/type/scalar/constant-query",
+  method: `post`,
+  request: {
+    query: { queryParam: "constantValue" },
+  },
+  response: {
+    status: 204,
+  },
+  kind: "MockApiDefinition",
+});