Fix a bug where we aren't checking the URL (#3211)

## Motivation and Context
In #3059 there was an accidental deletion of a test
## Description
Re-introduce checking the URL in protocol tests

## Checklist
<!--- If a checkbox below is not applicable, then please DELETE it
rather than leaving it unchecked -->
- [ ] I have updated `CHANGELOG.next.toml` if I made changes to the
smithy-rs codegen or runtime crates
- [ ] I have updated `CHANGELOG.next.toml` if I made changes to the AWS
SDK, generated SDK code, or SDK runtime crates

----

_By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice._

codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolTestGenerator.kt

@@ -233,6 +233,7 @@ class DefaultProtocolTestGenerator(
         checkHeaders(this, "http_request.headers()", httpRequestTestCase.headers)
         checkForbidHeaders(this, "http_request.headers()", httpRequestTestCase.forbidHeaders)
         checkRequiredHeaders(this, "http_request.headers()", httpRequestTestCase.requireHeaders)
+
         if (protocolSupport.requestBodySerialization) {
             // "If no request body is defined, then no assertions are made about the body of the message."
             httpRequestTestCase.body.orNull()?.also { body ->
@@ -248,6 +249,22 @@ class DefaultProtocolTestGenerator(
             if (!httpRequestTestCase.vendorParams.isEmpty) {
                 logger.warning("Test case provided vendorParams but these were ignored")
             }
+
+            rustTemplate(
+                """
+                let uri: #{Uri} = http_request.uri().parse().expect("invalid URI sent");
+                #{AssertEq}(http_request.method(), ${method.dq()}, "method was incorrect");
+                #{AssertEq}(uri.path(), ${uri.dq()}, "path was incorrect");
+                """,
+                *codegenScope,
+            )
+
+            resolvedHost.orNull()?.also { host ->
+                rustTemplate(
+                    """#{AssertEq}(uri.host().expect("host should be set"), ${host.dq()});""",
+                    *codegenScope,
+                )
+            }
         }
     }
 

codegen-client/src/test/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/protocol/ProtocolTestGeneratorTest.kt

@@ -327,6 +327,23 @@ class ProtocolTestGeneratorTest {
         err.message shouldContain "required query param missing"
     }
 
+    @Test
+    fun `test invalid path`() {
+        val err = assertThrows<CommandError> {
+            testService(
+                """
+                .uri("/incorrect-path?required&Hi=Hello%20there")
+                .header("X-Greeting", "Hi")
+                .method("POST")
+                """,
+            )
+        }
+
+        // Verify the test actually ran
+        err.message shouldContain "say_hello_request ... FAILED"
+        err.message shouldContain "path was incorrect"
+    }
+
     @Test
     fun `invalid header`() {
         val err = assertThrows<CommandError> {