Added tests for equality testing and hashing of SyclPlatform

Also enabled overlooked check_default_context

Author: oleksandr-pavlyk

dpctl/tests/test_sycl_platform.py

@@ -92,13 +92,29 @@ def check_default_context(platform):
     assert type(r) is dpctl.SyclContext
 
 
+def check_equal_and_hash(platform):
+    assert platform == platform
+    default_ctx = platform.default_context
+    for d in default_ctx.get_devices():
+        assert platform == d.sycl_platform
+        assert hash(platform) == hash(d.sycl_platform)
+
+
+def check_hash_in_dict(platform):
+    map = {platform: 0}
+    assert map[platform] == 0
+
+
 list_of_checks = [
     check_name,
     check_vendor,
     check_version,
     check_backend,
     check_print_info,
     check_repr,
+    check_default_context,
+    check_equal_and_hash,
+    check_hash_in_dict,
 ]