The strings representation is not ok, currently. Add a helper
function to improve it, and drop blank lines at beginning and
at the end of the dumps

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 tools/lib/python/kdoc/kdoc_yaml_file.py | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/tools/lib/python/kdoc/kdoc_yaml_file.py b/tools/lib/python/kdoc/kdoc_yaml_file.py
index db131503c3f6..18737abb1176 100644
--- a/tools/lib/python/kdoc/kdoc_yaml_file.py
+++ b/tools/lib/python/kdoc/kdoc_yaml_file.py
@@ -126,7 +126,7 @@ class KDocTestFile():
                 else:
                     key = "rst"
 
-                expected_dict[key]= out_style.output_symbols(fname, [arg])
+                expected_dict[key]= out_style.output_symbols(fname, [arg]).strip()
 
             name = f"{base_name}_{i:03d}"
 
@@ -148,8 +148,20 @@ class KDocTestFile():
         """
         import yaml
 
+        # Helper function to better handle multilines
+        def str_presenter(dumper, data):
+            if "\n" in data:
+                return dumper.represent_scalar("tag:yaml.org,2002:str", data, style="|")
+
+            return dumper.represent_scalar("tag:yaml.org,2002:str", data)
+
+        # Register the representer
+        yaml.add_representer(str, str_presenter)
+
         data = {"tests": self.tests}
 
         with open(self.test_file, "w", encoding="utf-8") as fp:
-            yaml.safe_dump(data, fp, sort_keys=False, default_style="|",
-                           default_flow_style=False, allow_unicode=True)
+            yaml.dump(data, fp,
+                      sort_keys=False, width=120, indent=2,
+                      default_flow_style=False, allow_unicode=True,
+                      explicit_start=False, explicit_end=False)
-- 
2.53.0