LibCpp: Add regression tests for the parser

For each .cpp file in the test suite data, there is a .ast file that
represents the "known good" baseline of the parser result.

Each .cpp file goes through the parser, and the result of
invoking `ASTNode::dump()` on the root node is compared to the
baseline to find regressions.

We also check that there were no parser errors when parsing the .cpp
files.

1 files changed, 8 insertions, 0 deletions

diff --git a/Userland/Libraries/LibCpp/Tests/if-else.cpp b/Userland/Libraries/LibCpp/Tests/if-else.cpp
new file mode 100644
index 0000000000..91d0fe62fe
--- /dev/null
+++ b/Userland/Libraries/LibCpp/Tests/if-else.cpp
@@ -0,0 +1,8 @@
+int foo()
+{
+    if (2)
+        return 2;
+    if (1 < 2)
+        return 1;
+    return 0;
+}