Changes imported from Abseil "staging" branch:

- 55c7dd8ad1570b4e6ce2103ed4d4b6becdea0d96 Remove line continuations which require CMake >= 3.0.  Al... by Jon Cohen <cohenjon@google.com>
  - ee66ad72a90259d6286bbfea7241ed976bb0f6fb Change absl::ParseDuration() to avoid double.  This allow... by Abseil Team <absl-team@google.com>
  - 89cf4cd49d8ff25cb3d29f06b2090029a2024e89 Internal change by Gennadiy Rozental <rogeeff@google.com>
  - cdb5879bf6aaf6bbd2ad1fe4a2b144bbdf0389c7 Internal change by Gennadiy Rozental <rogeeff@google.com>
  - e7b29d11bf24a63bf7637689ada8be7d619844fc Internal change by Gennadiy Rozental <rogeeff@google.com>
  - 2d4fc08d5d64a7760ad6230eccdb5b8014c2b0c3 Update the exception-safety testing framework. by Jon Cohen <cohenjon@google.com>

GitOrigin-RevId: 55c7dd8ad1570b4e6ce2103ed4d4b6becdea0d96
Change-Id: I6b560cbc4570dfc5aa9a2f90e84d69904df7eac5

absl/strings/strip_test.cc

@@ -116,4 +116,66 @@ TEST(Strip, StripSuffix) {
   EXPECT_EQ(absl::StripSuffix("", ""), "");
 }
 
+TEST(Strip, RemoveExtraAsciiWhitespace) {
+  const char* inputs[] = {
+      "No extra space",
+      "  Leading whitespace",
+      "Trailing whitespace  ",
+      "  Leading and trailing  ",
+      " Whitespace \t  in\v   middle  ",
+      "'Eeeeep!  \n Newlines!\n",
+      "nospaces",
+  };
+  const char* outputs[] = {
+      "No extra space",
+      "Leading whitespace",
+      "Trailing whitespace",
+      "Leading and trailing",
+      "Whitespace in middle",
+      "'Eeeeep! Newlines!",
+      "nospaces",
+  };
+  int NUM_TESTS = 7;
+
+  for (int i = 0; i < NUM_TESTS; i++) {
+    std::string s(inputs[i]);
+    absl::RemoveExtraAsciiWhitespace(&s);
+    EXPECT_STREQ(outputs[i], s.c_str());
+  }
+
+  // Test that absl::RemoveExtraAsciiWhitespace returns immediately for empty
+  // strings (It was adding the \0 character to the C++ std::string, which broke
+  // tests involving empty())
+  std::string zero_string = "";
+  assert(zero_string.empty());
+  absl::RemoveExtraAsciiWhitespace(&zero_string);
+  EXPECT_EQ(zero_string.size(), 0);
+  EXPECT_TRUE(zero_string.empty());
+}
+
+TEST(Strip, StripTrailingAsciiWhitespace) {
+  std::string test = "foo  ";
+  absl::StripTrailingAsciiWhitespace(&test);
+  EXPECT_EQ(test, "foo");
+
+  test = "   ";
+  absl::StripTrailingAsciiWhitespace(&test);
+  EXPECT_EQ(test, "");
+
+  test = "";
+  absl::StripTrailingAsciiWhitespace(&test);
+  EXPECT_EQ(test, "");
+
+  test = " abc\t";
+  absl::StripTrailingAsciiWhitespace(&test);
+  EXPECT_EQ(test, " abc");
+}
+
+TEST(String, StripLeadingAsciiWhitespace) {
+  absl::string_view orig = "\t  \n\f\r\n\vfoo";
+  EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace(orig));
+  orig = "\t  \n\f\r\v\n\t  \n\f\r\v\n";
+  EXPECT_EQ(absl::string_view(), absl::StripLeadingAsciiWhitespace(orig));
+}
+
 }  // namespace