ENH, TST: Added checks for missing debug files

Author: ganesh-k13

spin/cmds/meson.py

@@ -6,6 +6,7 @@
 import re
 import shutil
 import sys
+from pathlib import Path
 
 import click
 
@@ -149,6 +150,13 @@ def _check_coverage_tool_installation(coverage_type: GcovReports):
             "Generate coverage artefacts by running `spin test --gcov`"
         )
 
+    debug_files = Path(build_dir).rglob("*.gcno")
+    if len(list(debug_files)) == 0:
+        raise click.ClickException(
+            "debug build not found, cannot generate coverage reports. "
+            "Generate coverage artefacts by running `spin test --gcov`"
+        )
+
     # Verify the tools are installed prior to the build
     p = _run(["ninja", "-C", build_dir, "-t", "targets", "all"], output=False)
     if f"coverage-{coverage_type.value}" not in p.stdout.decode("ascii"):

spin/tests/test_build_cmds.py

@@ -86,6 +86,21 @@ def test_coverage_reports(report_type, output_file):
     ), f"coverage report not generated for gcov build ({report_type})"
 
 
+@pytest.mark.parametrize(
+    "command,error_message",
+    [
+        ("", "`build` folder not found"),
+        ("build", "debug build not found"),
+        ("test", "debug build not found"),
+    ],
+)
+def test_no_debug_coverage_attempt(command, error_message):
+    """Does gcov report throw error in case of missing debug files"""
+    spin(command) if command else None
+    output = spin("test", "--gcov-report", "html", sys_exit=False)
+    assert error_message in stderr(output)
+
+
 def test_expand_pythonpath():
     """Does an $ENV_VAR get expanded in `spin run`?"""
     output = spin("run", "echo $PYTHONPATH")