diff --git a/packages/babel-core/test/fixtures/plugins/override/generator-override/input.js b/packages/babel-core/test/fixtures/plugins/override/generator-override/input.js
new file mode 100644
index 000000000000..0afc6045cfe8
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/generator-override/input.js
@@ -0,0 +1 @@
+1;
diff --git a/packages/babel-core/test/fixtures/plugins/override/generator-override/options.json b/packages/babel-core/test/fixtures/plugins/override/generator-override/options.json
new file mode 100644
index 000000000000..14af0e5feac8
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/generator-override/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["./plugin"]
+}
diff --git a/packages/babel-core/test/fixtures/plugins/override/generator-override/output.js b/packages/babel-core/test/fixtures/plugins/override/generator-override/output.js
new file mode 100644
index 000000000000..0f57817f75fd
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/generator-override/output.js
@@ -0,0 +1 @@
+0;
diff --git a/packages/babel-core/test/fixtures/plugins/override/generator-override/plugin.js b/packages/babel-core/test/fixtures/plugins/override/generator-override/plugin.js
new file mode 100644
index 000000000000..e463f9ac0457
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/generator-override/plugin.js
@@ -0,0 +1,9 @@
+module.exports = function (api) {
+  return {
+    generatorOverride(ast, generatorOpts, code, generate) {
+      const result = generate(ast, generatorOpts, code);
+      result.code = result.code.replace("1", "0");
+      return result;
+    },
+  };
+};
diff --git a/packages/babel-core/test/fixtures/plugins/override/parser-override/input.js b/packages/babel-core/test/fixtures/plugins/override/parser-override/input.js
new file mode 100644
index 000000000000..0afc6045cfe8
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/parser-override/input.js
@@ -0,0 +1 @@
+1;
diff --git a/packages/babel-core/test/fixtures/plugins/override/parser-override/options.json b/packages/babel-core/test/fixtures/plugins/override/parser-override/options.json
new file mode 100644
index 000000000000..14af0e5feac8
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/parser-override/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["./plugin"]
+}
diff --git a/packages/babel-core/test/fixtures/plugins/override/parser-override/output.js b/packages/babel-core/test/fixtures/plugins/override/parser-override/output.js
new file mode 100644
index 000000000000..0f57817f75fd
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/parser-override/output.js
@@ -0,0 +1 @@
+0;
diff --git a/packages/babel-core/test/fixtures/plugins/override/parser-override/plugin.js b/packages/babel-core/test/fixtures/plugins/override/parser-override/plugin.js
new file mode 100644
index 000000000000..45639520f15f
--- /dev/null
+++ b/packages/babel-core/test/fixtures/plugins/override/parser-override/plugin.js
@@ -0,0 +1,9 @@
+module.exports = function (api) {
+  return {
+    parserOverride(code, opts, parse) {
+      const ast = parse(code, opts);
+      ast.program.body[0].expression.value = 0;
+      return ast;
+    },
+  };
+};