Fix test to use JsonElement.Parse instead of anonymous type serialization

Copilot · stephentoub · Copilot · commit c350e000d4de · 2026-01-02T20:57:44.000Z
The test was failing on net9.0 due to source-generated JSON serialization
not supporting anonymous types. Use JsonElement.Parse with raw JSON string
instead.

Co-authored-by: stephentoub &lt;2642209+stephentoub@users.noreply.github.com&gt;
diff --git a/tests/ModelContextProtocol.Tests/Client/McpClientTests.cs b/tests/ModelContextProtocol.Tests/Client/McpClientTests.cs
@@ -281,7 +281,7 @@ public async Task CreateSamplingHandler_ShouldUseToolRoleForToolResultMessages()
                     {
                         Id = "call_weather_123",
                         Name = "get_weather",
-                        Input = JsonSerializer.SerializeToElement(new { location = "Paris" }, McpJsonUtilities.DefaultOptions)
+                        Input = JsonElement.Parse("""{"location":"Paris"}""")
                     }]
                 },
                 new SamplingMessage

Original file line number	Diff line number	Diff line change
`@@ -281,7 +281,7 @@ public async Task CreateSamplingHandler_ShouldUseToolRoleForToolResultMessages()`
`281`	`281`	`{`
`282`	`282`	`Id = "call_weather_123",`
`283`	`283`	`Name = "get_weather",`
`284`		`- Input = JsonSerializer.SerializeToElement(new { location = "Paris" }, McpJsonUtilities.DefaultOptions)`
	`284`	`+ Input = JsonElement.Parse("""{"location":"Paris"}""")`
`285`	`285`	`}]`
`286`	`286`	`},`
`287`	`287`	`new SamplingMessage`