public Builder id(String id) {
            this.id = id;
            return this;
        }
Sets the smoke test case ID.

<p>Must be unique across all smoke test cases on other operations
bound to the same service.

<p>Must match the following regex: {@code ^[A-Za-z_][A-Za-z0-9_]+$}

@param id Test case ID.
@return Returns the builder.
smithy-smoke-test-traits/src/main/java/software/amazon/smithy/smoketests/traits/SmokeTestCase.java