update basic test

Author: bahmutov

tests/basic/README.md

@@ -0,0 +1,6 @@
+# basic test
+
+These tests run:
+- [ ] before the build
+- [x] after the build
+- [ ] on deploy success

tests/basic/netlify.toml

@@ -6,3 +6,11 @@ publish = "public"
   # local Cypress plugin will test our site after it is built
   # in production, please use: package = "netlify-plugin-cypress"
   package = "../../"
+
+  # do not run tests after deploy (testing)
+  [plugins.inputs]
+    enable = false
+
+  # run tests postBuild
+  [plugins.inputs.postBuild]
+    enable = true