test(tests/poly): added very basic polytrope test suite

Currently only tests default constructor

tests/poly/meson.build

@@ -0,0 +1,20 @@
+# Test files for const
+test_sources = [
+    'polyTest.cpp',
+]
+
+foreach test_file : test_sources
+  exe_name = test_file.split('.')[0]
+  message('Building test: ' + exe_name)
+
+  # Create an executable target for each test
+  test_exe = executable(
+      exe_name,
+      test_file,
+      dependencies: [gtest_dep, polysolver_dep],
+      install_rpath: '@loader_path/../../src'  # Ensure runtime library path resolves correctly
+  )
+
+  # Add the executable as a test
+  test(exe_name, test_exe)
+endforeach