32

tests/test_32.cpp

@@ -0,0 +1,74 @@
+// This file is generated by mkfile.py
+// Date: 2026-06-26
+
+#include <gtest/gtest.h>
+#include <solution/32.h>
+
+#include <string>
+#include <vector>
+
+class LongestValidParenthesesTest : public ::testing::Test
+{
+  protected:
+    void AssertLongestValidParentheses(const std::string &input, int expected)
+    {
+        std::vector<char> buffer(input.begin(), input.end());
+        buffer.push_back('\0');
+
+        EXPECT_EQ(longestValidParentheses(buffer.data()), expected);
+    }
+};
+
+TEST_F(LongestValidParenthesesTest, Example1)
+{
+    AssertLongestValidParentheses("(()", 2);
+}
+
+TEST_F(LongestValidParenthesesTest, Example2)
+{
+    AssertLongestValidParentheses(")()())", 4);
+}
+
+TEST_F(LongestValidParenthesesTest, Example3)
+{
+    AssertLongestValidParentheses("", 0);
+}
+
+TEST_F(LongestValidParenthesesTest, ReturnsZeroWhenThereIsNoValidPair)
+{
+    AssertLongestValidParentheses("(", 0);
+    AssertLongestValidParentheses(")", 0);
+    AssertLongestValidParentheses("((((", 0);
+    AssertLongestValidParentheses("))))", 0);
+    AssertLongestValidParentheses(")(", 0);
+}
+
+TEST_F(LongestValidParenthesesTest, EntireStringIsValid)
+{
+    AssertLongestValidParentheses("()", 2);
+    AssertLongestValidParentheses("()()", 4);
+    AssertLongestValidParentheses("(())", 4);
+    AssertLongestValidParentheses("(()())", 6);
+}
+
+TEST_F(LongestValidParenthesesTest, FindsValidSubstringAfterInvalidPrefix)
+{
+    AssertLongestValidParentheses(")()", 2);
+    AssertLongestValidParentheses("())(())", 4);
+    AssertLongestValidParentheses("())()()", 4);
+}
+
+TEST_F(LongestValidParenthesesTest, FindsLongestContiguousSubstring)
+{
+    AssertLongestValidParentheses("()(()", 2);
+    AssertLongestValidParentheses("(()(((()", 2);
+    AssertLongestValidParentheses("(()())())", 8);
+    AssertLongestValidParentheses("()(())", 6);
+}
+
+TEST_F(LongestValidParenthesesTest, HandlesMultipleSeparatedValidBlocks)
+{
+    AssertLongestValidParentheses("()(()())", 8);
+    AssertLongestValidParentheses("())(()())", 6);
+    AssertLongestValidParentheses("(()())())(()(()))", 8);
+}