"EC2EmptyQueryLists" protocol test fails

[jbelkins]

Describe the bug

There is a new protocol test in Smithy 1.49.0 that does not pass because Swift SDK serialization of empty lists in EC2Query is incorrect.

The test: Ec2QueryTestSDKTests.QueryListsRequestTest testEc2EmptyQueryLists()

Test has been disabled in codegen until this issue can be corrected.

Expected Behavior

Test Ec2QueryTestSDKTests.QueryListsRequestTest testEc2EmptyQueryLists() passes

Current Behavior

Test Ec2QueryTestSDKTests.QueryListsRequestTest testEc2EmptyQueryLists() fails as follows:

Test Case '-[Ec2QueryTestSDKTests.QueryListsRequestTest testEc2EmptyQueryLists]' started.
/Users/jbelkins/Code/Xcode3/aws-sdk-swift/codegen/protocol-test-codegen/build/smithyprojections/protocol-test-codegen/ec2-query/swift-codegen/Ec2QueryTestSDKTests/QueryListsRequestTest.swift:122: error: -[Ec2QueryTestSDKTests.QueryListsRequestTest testEc2EmptyQueryLists] : XCTAssertTrue failed - 
Actual: ListArg=&Action=QueryLists&Version=2020-01-08
Expected: Action=QueryLists&Version=2020-01-08

Reproduction Steps

• Set Smithy version to 1.49.0
• Enable this test by removing "EC2EmptyQueryLists" from the testsToIgnore in the EC2 protocol generator, if needed
• Generate & run protocol tests
• Observe results

Possible Solution

No response

Additional Information/Context

No response

AWS SWIFT SDK version used

main

Compiler and Version used

Xcode 15.4

Operating System and version

macOS 14.4.1