✅ Sends client connection preface
✅ Sends invalid connection preface

✅ Sends a frame with unknown type
✅ Sends a frame with undefined flag
✅ Sends a frame with reserved field bit

✅ Sends a DATA frame with 2^14 octets in length
✅ Sends a large size DATA frame that exceeds the SETTINGS_MAX_FRAME_SIZE
✅ Sends a large size HEADERS frame that exceeds the SETTINGS_MAX_FRAME_SIZE

✅ Sends invalid header block fragment
✅ Sends a PRIORITY frame while sending the header blocks
✅ Sends a HEADERS frame to another stream while sending the header blocks

✅ idle: Sends a DATA frame
✅ idle: Sends a RST_STREAM frame
✅ idle: Sends a WINDOW_UPDATE frame
✅ idle: Sends a CONTINUATION frame
✅ half closed (remote): Sends a DATA frame
✅ half closed (remote): Sends a HEADERS frame
✅ half closed (remote): Sends a CONTINUATION frame
✅ closed: Sends a DATA frame after sending RST_STREAM frame
✅ closed: Sends a HEADERS frame after sending RST_STREAM frame
✅ closed: Sends a CONTINUATION frame after sending RST_STREAM frame
✅ closed: Sends a DATA frame
✅ closed: Sends a HEADERS frame
✅ closed: Sends a CONTINUATION frame

✅ Sends even-numbered stream identifier
✅ Sends stream identifier that is numerically smaller than previous

✅ Sends HEADERS frames that causes their advertised concurrent stream limit to be exceeded

✅ Sends HEADERS frame that depends on itself
✅ Sends PRIORITY frame that depend on itself

✅ Sends an invalid PING frame for connection close

✅ Sends an unknown extension frame
✅ Sends an unknown extension frame in the middle of a header block

✅ Sends a DATA frame with 0x0 stream identifier
✅ Sends a DATA frame on the stream that is not in "open" or "half-closed (local)" state
✅ Sends a DATA frame with invalid pad length

✅ Sends multiple CONTINUATION frames preceded by a HEADERS frame
✅ Sends a CONTINUATION frame followed by any frame other than CONTINUATION
✅ Sends a CONTINUATION frame with 0x0 stream identifier
✅ Sends a CONTINUATION frame preceded by a HEADERS frame with END_HEADERS flag
✅ Sends a CONTINUATION frame preceded by a CONTINUATION frame with END_HEADERS flag
✅ Sends a CONTINUATION frame preceded by a DATA frame

✅ Sends a HEADERS frame without the END_HEADERS flag, and a PRIORITY frame
✅ Sends a HEADERS frame to another stream while sending a HEADERS frame
✅ Sends a HEADERS frame with 0x0 stream identifier
✅ Sends a HEADERS frame with invalid pad length

✅ Sends a PRIORITY frame with 0x0 stream identifier
✅ Sends a PRIORITY frame with a length other than 5 octets

✅ Sends a RST_STREAM frame with 0x0 stream identifier
✅ Sends a RST_STREAM frame on a idle stream
✅ Sends a RST_STREAM frame with a length other than 4 octets

❌ Sends a SETTINGS frame with ACK flag and payload
	GOAWAY Frame (Error Code: FRAME_SIZE_ERROR)
❌ Sends a SETTINGS frame with a stream identifier other than 0x0
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
✅ Sends a SETTINGS frame with a length other than a multiple of 6 octets

❌ SETTINGS_ENABLE_PUSH (0x2): Sends the value other than 0 or 1
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ SETTINGS_INITIAL_WINDOW_SIZE (0x4): Sends the value above the maximum flow control window size
	GOAWAY Frame (Error Code: FLOW_CONTROL_ERROR)
❌ SETTINGS_MAX_FRAME_SIZE (0x5): Sends the value below the initial value
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ SETTINGS_MAX_FRAME_SIZE (0x5): Sends the value above the maximum allowed frame size
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
✅ Sends a SETTINGS frame with unknown identifier

❌ Sends multiple values of SETTINGS_INITIAL_WINDOW_SIZE
	DATA Frame (length:1, flags:0x00, stream_id:1)
✅ Sends a SETTINGS frame without ACK flag

✅ Sends a PING frame
✅ Sends a PING frame with ACK
✅ Sends a PING frame with a stream identifier field value other than 0x0
✅ Sends a PING frame with a length field value other than 8

❌ Sends a GOAWAY frame with a stream identifier other than 0x0
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)

❌ Sends a WINDOW_UPDATE frame with a flow control window increment of 0
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ Sends a WINDOW_UPDATE frame with a flow control window increment of 0 on a stream
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ Sends a WINDOW_UPDATE frame with a length other than 4 octets
	GOAWAY Frame (Error Code: FRAME_SIZE_ERROR)

❌ Sends SETTINGS frame to set the initial window size to 1 and sends HEADERS frame
	DATA Frame (length:1, flags:0x00, stream_id:1)
❌ Sends multiple WINDOW_UPDATE frames increasing the flow control window to above 2^31-1
	GOAWAY Frame (Error Code: FLOW_CONTROL_ERROR)
❌ Sends multiple WINDOW_UPDATE frames increasing the flow control window to above 2^31-1 on a stream
	RST_STREAM Frame (Error Code: FLOW_CONTROL_ERROR)

❌ Changes SETTINGS_INITIAL_WINDOW_SIZE after sending HEADERS frame
	DATA Frame (length:1, flags:0x00, stream_id:1)
❌ Sends a SETTINGS frame for window size to be negative
	DATA Frame (length:1, flags:0x00, stream_id:1)
❌ Sends a SETTINGS_INITIAL_WINDOW_SIZE settings with an exceeded maximum window size value
	GOAWAY Frame (Error Code: FLOW_CONTROL_ERROR)

✅ Sends a GOAWAY frame with unknown error code
✅ Sends a RST_STREAM frame with unknown error code

✅ Sends a second HEADERS frame without the END_STREAM flag

❌ Sends a HEADERS frame that contains the header field name in uppercase letters
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)

❌ Sends a HEADERS frame that contains a unknown pseudo-header field
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ Sends a HEADERS frame that contains the pseudo-header field defined for response
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
✅ Sends a HEADERS frame that contains a pseudo-header field as trailers
❌ Sends a HEADERS frame that contains a pseudo-header field that appears in a header block after a regular header field
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)

❌ Sends a HEADERS frame that contains the connection-specific header field
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ Sends a HEADERS frame that contains the TE header field with any value other than "trailers"
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)

✅ Sends a HEADERS frame with empty ":path" pseudo-header field
✅ Sends a HEADERS frame that omits ":method" pseudo-header field
✅ Sends a HEADERS frame that omits ":scheme" pseudo-header field
✅ Sends a HEADERS frame that omits ":path" pseudo-header field
✅ Sends a HEADERS frame with duplicated ":method" pseudo-header field
✅ Sends a HEADERS frame with duplicated ":scheme" pseudo-header field
✅ Sends a HEADERS frame with duplicated ":path" pseudo-header field

❌ Sends a HEADERS frame with the "content-length" header field which does not equal the DATA frame payload length
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)
❌ Sends a HEADERS frame with the "content-length" header field which does not equal the sum of the multiple DATA frames payload length
	GOAWAY Frame (Error Code: PROTOCOL_ERROR)

✅ Sends a PUSH_PROMISE frame