3 files changed, 96 insertions, 0 deletions
diff --git a/tools/slang-test/slang-test.vcxproj b/tools/slang-test/slang-test.vcxproj
index 62b79d627..8f6096f86 100644
--- a/tools/slang-test/slang-test.vcxproj
+++ b/tools/slang-test/slang-test.vcxproj
@@ -179,6 +179,7 @@
     <ClCompile Include="unit-test-free-list.cpp" />
     <ClCompile Include="unit-test-memory-arena.cpp" />
     <ClCompile Include="unit-test-path.cpp" />
+    <ClCompile Include="unit-test-string.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\source\core\core.vcxproj">
diff --git a/tools/slang-test/slang-test.vcxproj.filters b/tools/slang-test/slang-test.vcxproj.filters
index e50c56819..e5cd23212 100644
--- a/tools/slang-test/slang-test.vcxproj.filters
+++ b/tools/slang-test/slang-test.vcxproj.filters
@@ -56,5 +56,8 @@
     <ClCompile Include="unit-test-path.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="unit-test-string.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
 \ No newline at end of file
diff --git a/tools/slang-test/unit-test-string.cpp b/tools/slang-test/unit-test-string.cpp
new file mode 100644
index 000000000..6110ca55e
--- /dev/null
+++ b/tools/slang-test/unit-test-string.cpp
@@ -0,0 +1,92 @@
+// unit-test-path.cpp
+
+#include "../../source/core/slang-string-util.h"
+
+#include "test-context.h"
+
+using namespace Slang;
+
+static bool _areEqual(const List<UnownedStringSlice>& lines, const UnownedStringSlice* checkLines, Int checkLinesCount)
+{
+    if (checkLinesCount != lines.getCount())
+    {
+        return false;
+    }
+
+    for (Int i = 0; i < checkLinesCount; ++i)
+    {
+        if (lines[i] != checkLines[i])
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+static bool _checkLines(const UnownedStringSlice& input, const UnownedStringSlice* checkLines, Int checkLinesCount)
+{
+    List<UnownedStringSlice> lines;
+    UnownedStringSlice text(input);
+    while (true)
+    {
+        UnownedStringSlice line = StringUtil::extractLine(text);
+        if (line.begin() == nullptr)
+        {
+            return _areEqual(lines, checkLines, checkLinesCount);
+        }
+        lines.add(line);
+    }
+}
+
+static bool _checkLineParser(const UnownedStringSlice& input)
+{
+    UnownedStringSlice remaining(input);
+    for (const auto line : LineParser(input))
+    {
+        UnownedStringSlice extractLine = StringUtil::extractLine(remaining);
+        if (line != extractLine)
+        {
+            return false;
+        }
+        // Handle hitting the end
+        if (line.begin() == nullptr || extractLine.begin() == nullptr)
+        {
+            return line.begin() == extractLine.begin();
+        }
+    }
+
+    return remaining.begin() == nullptr;
+}
+
+static void stringUnitTest()
+{
+    {
+        UnownedStringSlice checkLines[] = { UnownedStringSlice::fromLiteral("") };
+        SLANG_CHECK(_checkLines(UnownedStringSlice::fromLiteral(""), checkLines, SLANG_COUNT_OF(checkLines)));
+    }
+    {
+        // Will emit no lines
+        SLANG_CHECK(_checkLines(UnownedStringSlice(nullptr, nullptr), nullptr, 0));
+    }
+    {
+        // Two lines - both empty
+        UnownedStringSlice checkLines[] = { UnownedStringSlice(), UnownedStringSlice()};
+        SLANG_CHECK(_checkLines(UnownedStringSlice::fromLiteral("\n"), checkLines, SLANG_COUNT_OF(checkLines)));
+    }
+    {
+        UnownedStringSlice checkLines[] = { UnownedStringSlice::fromLiteral("Hello"), UnownedStringSlice::fromLiteral("World!") };
+        SLANG_CHECK(_checkLines(UnownedStringSlice::fromLiteral("Hello\nWorld!"), checkLines, SLANG_COUNT_OF(checkLines)));
+    }
+    {
+        UnownedStringSlice checkLines[] = { UnownedStringSlice::fromLiteral("Hello"), UnownedStringSlice::fromLiteral("World!"), UnownedStringSlice() };
+        SLANG_CHECK(_checkLines(UnownedStringSlice::fromLiteral("Hello\n\rWorld!\n"), checkLines, SLANG_COUNT_OF(checkLines)));
+    }
+
+    {
+        SLANG_CHECK(_checkLineParser(UnownedStringSlice::fromLiteral("Hello\n\rWorld!\n")));
+        SLANG_CHECK(_checkLineParser(UnownedStringSlice::fromLiteral("\n")));
+        SLANG_CHECK(_checkLineParser(UnownedStringSlice::fromLiteral("")));
+    }
+}
+
+SLANG_UNIT_TEST("String", stringUnitTest);