test case to cover docker/compose#11937

Signed-off-by: Nicolas De Loof <[email protected]>

Author: ndeloof

loader/extends_test.go

@@ -465,3 +465,22 @@ services:
 	assert.NilError(t, err)
 	assert.Equal(t, extendsCount, 2)
 }
+
+func TestExtendsReset(t *testing.T) {
+	yaml := `
+name: test-extends-reset
+services:
+  test:
+    extends:
+      file: testdata/extends/reset.yaml
+      service: base
+`
+	p, err := Load(types.ConfigDetails{
+		ConfigFiles: []types.ConfigFile{{
+			Content:  []byte(yaml),
+			Filename: "-",
+		}},
+	})
+	assert.NilError(t, err)
+	assert.Check(t, p.Services["test"].Command == nil)
+}

loader/testdata/extends/reset.yaml

@@ -0,0 +1,7 @@
+services:
+  init:
+    image: alpine:latest
+    command: "sleep infinity"
+  base:
+    extends: { service: init }
+    command: !reset