Merge pull request #400 from horw/fix/elf-not-found-linux

fix: linux elf not found explicit error msg

Author: hfudev

pytest-embedded-idf/pytest_embedded_idf/linux.py

@@ -46,6 +46,9 @@ def __init__(
         if self.app.target != 'linux':
             raise ValueError(f'Targets do not match. App target: {self.app.target}, Cmd target: "linux".')
 
+        if not self.app.elf_file:
+            raise ValueError('No ELF file found. Please check the app build folder.')
+
         super().__init__(cmd=[self.app.elf_file], **kwargs)
 
     def hard_reset(self) -> None: