Add Telnet regression test suite

2026-09-17 13:33:45 +02:00
parent 5e6d9138c4
commit da967f4d56
6 changed files with 258 additions and 11 deletions
@@ -0,0 +1,77 @@
+# encoding: UTF-8
+
+require_relative "test_helper"
+require_relative "../lib/meow/telnet"
+require_relative "../lib/meow/text_pipeline"
+
+module MeowTextPipelineTest
+  Telnet = MeowClient::Telnet
+
+  def self.bytes(*values)
+    values.pack("C*")
+  end
+
+  MeowTest.test("ANSI CSI and OSC sequences are filtered across chunks") do
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    records = []
+    records.concat(pipeline.feed("red\e[3".b).records)
+    records.concat(pipeline.feed("1m text\e]0;title\e".b).records)
+    records.concat(pipeline.feed("\\tail\r\n".b).records)
+    MeowTest.assert_equal(["red texttail"], records)
+  end
+
+  MeowTest.test("Line framing handles CRLF CR-NUL bare CR and LF across chunks") do
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    MeowTest.assert_equal(["one"], pipeline.feed("one\r".b).records)
+    MeowTest.assert_equal(["two"], pipeline.feed("\ntwo\r".b).records)
+    MeowTest.assert_equal(["three"], pipeline.feed("\0three\n".b).records)
+    MeowTest.assert_equal(["four"], pipeline.feed("four\rfive".b).records)
+    MeowTest.assert_equal(["five"], pipeline.finish)
+  end
+
+  MeowTest.test("UTF-8 characters survive arbitrary byte boundaries") do
+    encoded = "Price: €\n".encode("UTF-8").b
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    records = []
+    encoded.each_byte { |byte| records.concat(pipeline.feed(bytes(byte)).records) }
+    MeowTest.assert_equal(["Price: €"], records)
+  end
+
+  MeowTest.test("Invalid and incomplete UTF-8 are replaced safely") do
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    invalid = pipeline.feed("bad\xC0\n".b)
+    MeowTest.assert_equal(["bad\uFFFD"], invalid.records)
+
+    incomplete = MeowClient::TextPipeline.new("UTF-8")
+    incomplete.feed("tail \xE2\x82".b)
+    MeowTest.assert_equal(["tail \uFFFD"], incomplete.finish)
+  end
+
+  MeowTest.test("Legacy encodings are converted to UTF-8") do
+    windows = MeowClient::TextPipeline.new("Windows-1252")
+    latin = MeowClient::TextPipeline.new("ISO-8859-1")
+    MeowTest.assert_equal(["€"], windows.feed("\x80\n".b).records)
+    MeowTest.assert_equal(["é"], latin.feed("\xE9\n".b).records)
+  end
+
+  MeowTest.test("Prompts can be detected flushed and finished") do
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    MeowTest.assert_empty(pipeline.feed("Password: ".b).records)
+    MeowTest.assert(pipeline.prompt_due?(0))
+    MeowTest.assert_equal("Password: ", pipeline.flush_prompt)
+    MeowTest.refute(pipeline.prompt_due?(0))
+
+    pipeline.feed("unfinished".b)
+    MeowTest.assert_equal(["unfinished"], pipeline.finish)
+  end
+
+  MeowTest.test("Text pipeline propagates Telnet replies and echo state") do
+    pipeline = MeowClient::TextPipeline.new("UTF-8")
+    packet = "hello".b + bytes(Telnet::IAC, Telnet::WILL, Telnet::ECHO) + " world\r\n".b
+    result = pipeline.feed(packet)
+    MeowTest.assert_equal(["hello world"], result.records)
+    MeowTest.assert_equal([bytes(Telnet::IAC, Telnet::DO, Telnet::ECHO)], result.replies)
+    MeowTest.assert_equal([[:remote_echo, true]], result.events)
+    MeowTest.assert(pipeline.remote_echo?)
+  end
+end