diff --git a/tools/test_build_system/buildv2/test_build_event_callbacks.py b/tools/test_build_system/buildv2/test_build_event_callbacks.py
new file mode 100644
index 0000000000..d03a2b20f7
--- /dev/null
+++ b/tools/test_build_system/buildv2/test_build_event_callbacks.py
@@ -0,0 +1,50 @@
+# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Apache-2.0
+from pathlib import Path
+
+from test_build_system_helpers import IdfPyFunc
+from test_build_system_helpers import get_snapshot
+
+
+def _write_project_include(test_app_copy: Path, content: str) -> None:
+    """Write content to the main component's project_include.cmake file."""
+    project_include = test_app_copy / 'main' / 'project_include.cmake'
+    project_include.write_text(content, encoding='utf-8')
+
+
+def test_post_elf_callback_fires_before_binary(test_app_copy: Path, idf_py: IdfPyFunc) -> None:
+    """
+    Verify a POST_ELF callback fires after the executable target exists but before
+    the binary (.bin) is generated. The callback attaches a POST_BUILD step to the
+    executable via add_custom_command(TARGET ... POST_BUILD).
+    """
+    _write_project_include(
+        test_app_copy,
+        '\n'.join(
+            [
+                'function(__test_post_elf_cb target)',
+                '    add_custom_command(TARGET ${target} POST_BUILD',
+                '        COMMAND ${CMAKE_COMMAND} -E sleep 1',
+                '        COMMAND ${CMAKE_COMMAND} -E touch "${CMAKE_BINARY_DIR}/postelf_file")',
+                'endfunction()',
+                'idf_component_register_build_event_callback(EVENT POST_ELF CALLBACK __test_post_elf_cb)',
+            ]
+        ),
+    )
+
+    idf_py('build')
+
+    elf_file = test_app_copy / 'build' / 'build_test_app.elf'
+    postelf_file = test_app_copy / 'build' / 'postelf_file'
+    bin_timestamp = test_app_copy / 'build' / 'build_test_app.bin'
+
+    assert elf_file.exists(), 'ELF file must exist'
+    assert postelf_file.exists(), 'post-elf file must be created'
+    assert bin_timestamp.exists(), 'bin timestamp must exist'
+
+    snap = get_snapshot([str(elf_file), str(postelf_file), str(bin_timestamp)])
+    mtimes = dict(snap.info)
+    assert mtimes[str(postelf_file)] > mtimes[str(elf_file)], 'post-ELF file must be created after ELF file'
+    assert mtimes[str(bin_timestamp)] > mtimes[str(postelf_file)], (
+        'Binary generation must occur after post-ELF dependency'
+    )