E3-731: Add test for added build number

tests/test_e3.py

@@ -30,3 +30,12 @@ def test_incorrect_module_name(wrappers):
     rc, _, errs = wrapper.run_make("build")
     assert rc == 2
     assert f"E3_MODULE_NAME '{module_name}' is not valid" in errs
+
+
+def test_add_missing_build_number(wrapper: Wrapper):
+    version = "1.2.3"
+    wrapper.write_dot_local_data("CONFIG_MODULE", {"E3_MODULE_VERSION": version})
+
+    rc, outs, _ = wrapper.run_make("vars")
+    assert rc == 0
+    assert f"E3_MODULE_VERSION = {version}+0" in outs.splitlines()