Jupyter Kernel Conformance

Protocol compliance test results for Jupyter kernels

Last tested April 11, 2026 at 03:26 PMd381b07
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scala

scala (scala) • Protocol 5.4

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12 tests failing

15/27 passing (56%)
Protocol error: Error deserializing content for msg_type `execute_reply`: invalid type: string "\u{1b}[36mx\u{1b}[39m: \u{1b}[32mInt\u{1b}[39m = \u{1b}[32m1\u{1b}[39m", expected internally tagged enum ExpressionResult(3)
execute_reply_ok, status_busy_idle_lifecycle, execute_input_broadcast
Timeout(2)
stdin_input_request, comms_lifecycle
Protocol error: Error deserializing content for msg_type `history_reply`: missing field `history`(1)
history_request
Protocol error: Error deserializing content for msg_type `error`: missing field `traceback`(1)
error_handling
Protocol error: Error deserializing content for msg_type `execute_reply`: invalid type: string "\u{1b}[36mid\u{1b}[39m: \u{1b}[32mString\u{1b}[39m = \u{1b}[32m\"cba5f930-bdb3-4558-bd7d-b0b975d4e050\"\u{1b}[39m", expected internally tagged enum ExpressionResult(1)
execute_result
Protocol error: Error deserializing content for msg_type `execute_reply`: invalid type: string "\u{1b}[36mres11\u{1b}[39m: \u{1b}[32mInt\u{1b}[39m = \u{1b}[32m2\u{1b}[39m", expected internally tagged enum ExpressionResult(1)
rich_execute_result
Protocol error: Error deserializing content for msg_type `interrupt_reply`: missing field `status`(1)
interrupt_request
Counts didn't increment: 12 -> 0(1)
execution_count_increments
Protocol error: Error deserializing content for msg_type `shutdown_reply`: missing field `status`(1)
shutdown_reply

Timeout failures often indicate the kernel doesn't implement certain message types. Check if these messages are supported in your kernel.

heartbeat_responds
Kernel responds to heartbeat ping within timeout
heartbeat
Pass
iopub_welcome
Kernel sends iopub_welcome on XPUB subscription (JEP 65)
iopub_welcome
Partial
kernel_info_reply_valid
Kernel returns valid kernel_info_reply with status ok
kernel_info_request
Pass
kernel_info_has_language_info
kernel_info_reply contains non-empty language_info.name
kernel_info_request
Pass
kernel_info_has_protocol_version
kernel_info_reply contains non-empty protocol_version
kernel_info_request
Pass
execute_stdout
Execute code that prints produces stream message on stdout
execute_request3678ms
Pass
execute_stderr
Execute code that prints to stderr produces stream message
stream1404ms
Pass
execute_reply_ok
Execute valid code returns execute_reply with status ok
execute_request1144ms
Fail
status_busy_idle_lifecycle
Kernel broadcasts busy then idle status on iopub during execution
status1068ms
Fail
execute_input_broadcast
Kernel broadcasts execute_input on iopub when executing
execute_input815ms
Fail
shutdown_reply
Kernel responds to shutdown request and terminates cleanly
shutdown_request10ms
Fail

complete_request
Kernel responds to completion request with complete_reply
complete_request908ms
Pass
inspect_request
Kernel responds to inspection request with inspect_reply
inspect_request929ms
Pass
is_complete_complete
Kernel correctly identifies complete code as 'complete'
is_complete_request11ms
Pass
is_complete_incomplete
Kernel correctly identifies incomplete code as 'incomplete'
is_complete_request35ms
Partial
history_request
Kernel responds to history request with history_reply
history_request873ms
Fail
comm_info_request
Kernel responds to comm_info request with comm_info_reply
comm_info_request12ms
Pass
error_handling
Kernel properly reports errors for invalid syntax
execute_request20ms
Fail

display_data
Kernel can produce display_data messages for rich output
display_data748ms
Pass
update_display_data
Kernel can update existing displays via update_display_data
update_display_data844ms
Partial
execute_result
Expression evaluation produces execute_result on iopub
execute_result639ms
Fail
rich_execute_result
Expression evaluation produces execute_result with rich MIME types (HTML, images, etc.)
execute_result698ms
Fail

stdin_input_request
Kernel can request input from frontend via stdin channel
input_request10082ms
Fail
comms_lifecycle
Kernel supports comm open/msg/close lifecycle
comm_open10634ms
Fail
interrupt_request
Kernel responds to interrupt request on control channel
interrupt_request5ms
Fail
execution_count_increments
Execution count increments with each execute_request
execute_request693ms
Fail
parent_header_correlation
All response messages contain correct parent_header
parent_header685ms
Pass