[libc][newheadergen]: adding entry_point testing (#99587)

Author: aaryanshukla

libc/newhdrgen/tests/input/test_small.yaml

@@ -54,4 +54,13 @@ functions:
     standards: 
       - stdc
     guard: LIBC_TYPES_HAS_FLOAT16_AND_FLOAT128
+  - name: func_f
+    return_type: _Float16
+    arguments:
+      - type: int
+      - type: double
+      - type: float
+    standards: 
+      - stdc
+
 

libc/newhdrgen/tests/test_integration.py

@@ -8,7 +8,6 @@
 
 class TestHeaderGenIntegration(unittest.TestCase):
     def setUp(self):
-
         self.output_dir = Path(
             args.output_dir if args.output_dir else "libc/newhdrgen/tests/output"
         )
@@ -17,19 +16,24 @@ def setUp(self):
 
         self.source_dir = Path(__file__).resolve().parent.parent.parent.parent
 
-    def run_script(self, yaml_file, h_def_file, output_dir):
+    def run_script(self, yaml_file, h_def_file, output_dir, entry_points):
         yaml_file = self.source_dir / yaml_file
         h_def_file = self.source_dir / h_def_file
+        command = [
+            "python3",
+            str(self.source_dir / "libc/newhdrgen/yaml_to_classes.py"),
+            str(yaml_file),
+            "--h_def_file",
+            str(h_def_file),
+            "--output_dir",
+            str(output_dir),
+        ]
+
+        for entry_point in entry_points:
+            command.extend(["--e", entry_point])
+
         result = subprocess.run(
-            [
-                "python3",
-                str(self.source_dir / "libc/newhdrgen/yaml_to_classes.py"),
-                str(yaml_file),
-                "--h_def_file",
-                str(h_def_file),
-                "--output_dir",
-                str(output_dir),
-            ],
+            command,
             capture_output=True,
             text=True,
         )
@@ -53,11 +57,12 @@ def test_generate_header(self):
             self.source_dir / "libc/newhdrgen/tests/expected_output/test_header.h"
         )
         output_file = self.output_dir / "test_small.h"
+        entry_points = {"func_b", "func_a", "func_c", "func_d", "func_e"}
 
         if not self.output_dir.exists():
             self.output_dir.mkdir(parents=True)
 
-        self.run_script(yaml_file, h_def_file, self.output_dir)
+        self.run_script(yaml_file, h_def_file, self.output_dir, entry_points)
 
         self.compare_files(output_file, expected_output_file)