void test_tangle() {
  istringstream in("a\nb\nc\n:(before b)\nd\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "adbc");
}

void test_tangle2() {
  istringstream in("a\nb\nc\n:(after b)\nd\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "abdc");
}

void test_tangle_at_end() {
  istringstream in("a\nb\nc\n:(after c)\nd\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "abcd");
}

void test_tangle_indents_hunks_correctly() {
  istringstream in("a\n  b\nc\n:(after b)\nd\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "a  b  dc");
}

void test_tangle_warns_on_missing_target() {
  Hide_warnings = true;
  istringstream in(":(before)\nabc def\n");
  list<string> lines;
  tangle(in, lines);
  CHECK_TRACE_WARNS();
}

void test_tangle_warns_on_unknown_target() {
  Hide_warnings = true;
  istringstream in(":(before \"foo\")\nabc def\n");
  list<string> lines;
  tangle(in, lines);
  CHECK_TRACE_WARNS();
}

void test_tangle_delete_range_of_lines() {
  istringstream in("a\nb {\nc\n}\n:(delete{} \"b\")\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "a");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "b");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "c");
}

void test_tangle_replace() {
  istringstream in("a\nb\nc\n:(replace b)\nd\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "adc");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "b");
}

void test_tangle_replace_range_of_lines() {
  istringstream in("a\nb {\nc\n}\n:(replace{} \"b\")\nd\ne\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "ade");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "b {");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "c");
}

void test_tangle_replace_tracks_old_lines() {
  istringstream in("a\nb {\nc\n}\n:(replace{} \"b\")\nd\n:OLD_CONTENTS\ne\n");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "adce");
  CHECK_TRACE_DOESNT_CONTAIN("tangle", "b {");
}

void test_tangle_nested_patterns() {
  istringstream in("a\nc\nb\nc\nd\n:(after \"b\" then \"c\")\ne");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "acbced");
}

void test_tangle_nested_patterns2() {
  istringstream in("a\nc\nb\nc\nd\n:(after \"c\" following \"b\")\ne");
  list<string> dummy;
  tangle(in, dummy);
  CHECK_TRACE_CONTENTS("tangle", "acbced");
}

// todo: include line numbers in tangle errors



void test_tangle_supports_scenarios() {
  istringstream in(":(scenario does_bar)\nabc def\n+layer1: pqr\n+layer2: xyz");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc def\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqrlayer2: xyz\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_supports_configurable_toplevel() {
  istringstream in(":(scenarios foo)\n:(scenario does_bar)\nabc def\n+layer1: pqr");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  foo(\"abc def\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());

  istringstream cleanup(":(scenarios run)\n");
  tangle(cleanup, lines);
}

void test_tangle_supports_strings_in_scenarios() {
  istringstream in(":(scenario does_bar)\nabc \"def\"\n+layer1: pqr\n+layer2: \"xyz\"");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc \\\"def\\\"\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqrlayer2: \\\"xyz\\\"\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_supports_strings_in_scenarios2() {
  istringstream in(":(scenario does_bar)\nabc \"\"\n+layer1: pqr\n+layer2: \"\"");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc \\\"\\\"\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqrlayer2: \\\"\\\"\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_supports_multiline_input_in_scenarios() {
  istringstream in(":(scenario does_bar)\nabc def\n  efg\n+layer1: pqr\n+layer2: \"\"");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc def\\n  efg\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqrlayer2: \\\"\\\"\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_supports_reset_in_scenarios() {
  istringstream in(":(scenario does_bar)\nabc def\n===\nefg\n+layer1: pqr\n+layer2: \"\"");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc def\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CLEAR_TRACE;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"efg\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqrlayer2: \\\"\\\"\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_can_check_for_absence_at_end_of_scenarios() {
  istringstream in(":(scenario does_bar)\nabc def\n  efg\n+layer1: pqr\n-layer1: xyz");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc def\\n  efg\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_DOESNT_CONTAIN(\"layer1: xyz\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_can_check_for_absence_at_end_of_scenarios2() {
  istringstream in(":(scenario does_bar)\nabc def\n  efg\n-layer1: pqr\n-layer1: xyz");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "  run(\"abc def\\n  efg\\n\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_DOESNT_CONTAIN(\"layer1: pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_DOESNT_CONTAIN(\"layer1: xyz\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_can_check_return_values_of_scenarios() {
  istringstream in(":(scenario does_bar)\nabc def\n=> pqr");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "{");  lines.pop_front();
  CHECK_EQ(lines.front(), "  ostringstream os;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  TEMP(tmp, run(\"abc def\\n\"));");  lines.pop_front();
  CHECK_EQ(lines.front(), "  os << tmp;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_EQ(os.str(), \"pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}

void test_tangle_can_check_return_values_of_multiple_scenarios() {
  istringstream in(":(scenario does_bar)\nabc\n=> pqr\n+layer1: pqr\ndef\n=> xyz\n");
  list<string> lines;
  tangle(in, lines);
  CHECK_EQ(lines.front(), "TEST(does_bar)");  lines.pop_front();
  CHECK_EQ(lines.front(), "{");  lines.pop_front();
  CHECK_EQ(lines.front(), "  ostringstream os;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  TEMP(tmp, run(\"abc\\n\"));");  lines.pop_front();
  CHECK_EQ(lines.front(), "  os << tmp;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_EQ(os.str(), \"pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_TRACE_CONTENTS(\"layer1: pqr\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "{");  lines.pop_front();
  CHECK_EQ(lines.front(), "  ostringstream os;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  TEMP(tmp, run(\"def\\n\"));");  lines.pop_front();
  CHECK_EQ(lines.front(), "  os << tmp;");  lines.pop_front();
  CHECK_EQ(lines.front(), "  CHECK_EQ(os.str(), \"xyz\");");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK_EQ(lines.front(), "}");  lines.pop_front();
  CHECK(lines.empty());
}



void test_trim() {
  CHECK_EQ(trim(""), "");
  CHECK_EQ(trim(" "), "");
  CHECK_EQ(trim("  "), "");
  CHECK_EQ(trim("a"), "a");
  CHECK_EQ(trim(" a"), "a");
  CHECK_EQ(trim("  a"), "a");
  CHECK_EQ(trim("  ab"), "ab");
  CHECK_EQ(trim("a "), "a");
  CHECK_EQ(trim("a  "), "a");
  CHECK_EQ(trim("ab  "), "ab");
  CHECK_EQ(trim(" a "), "a");
  CHECK_EQ(trim("  a  "), "a");
  CHECK_EQ(trim("  ab  "), "ab");
}

void test_strip_indent() {
  CHECK_EQ(strip_indent("", 0), "");
  CHECK_EQ(strip_indent("", 1), "");
  CHECK_EQ(strip_indent("", 3), "");
  CHECK_EQ(strip_indent(" ", 0), " ");
  CHECK_EQ(strip_indent(" a", 0), " a");
  CHECK_EQ(strip_indent(" ", 1), "");
  CHECK_EQ(strip_indent(" a", 1), "a");
  CHECK_EQ(strip_indent(" ", 2), "");
  CHECK_EQ(strip_indent(" a", 2), "a");
  CHECK_EQ(strip_indent("  ", 0), "  ");
  CHECK_EQ(strip_indent("  a", 0), "  a");
  CHECK_EQ(strip_indent("  ", 1), " ");
  CHECK_EQ(strip_indent("  a", 1), " a");
  CHECK_EQ(strip_indent("  ", 2), "");
  CHECK_EQ(strip_indent("  a", 2), "a");
  CHECK_EQ(strip_indent("  ", 3), "");
  CHECK_EQ(strip_indent("  a", 3), "a");
}