chore(docs): add mock info and fix test name

docs/development.md

@@ -16,4 +16,22 @@ This creates a local Vault installation in development mode and enables the plug
 
 ## Configuring the plugin
 
-Follow [the configuration guide](configuration.md).
+Follow [the configuration guide](configuration.md).
+
+## Mock usage
+
+By setting the API key to `mock` the plugin is forced to use the mock API client, which does not communciate
+with the Vercel API at all. Useful for development purposes and refactoring. The returned `bearer_token` is hard coded to `some-bearer-token`.
+
+```
+$ vault write vercel-secrets/config api_key=mock
+$ vault read vercel-secrets/token
+Key                Value
+---                -----
+lease_id           vercel-secrets/token/BIxRweNgXNSQsnbeBBmiea8X
+lease_duration     10m
+lease_renewable    false
+bearer_token       some-bearer-token
+team_id            n/a
+token_id           vault-plugin-secrets-vercel-1689595722412039000-1689595722412067000
+```

internal/plugin/path_token_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestToken_Create2(t *testing.T) {
+func TestToken_Create(t *testing.T) {
 	t.Parallel()
 
 	cases := map[string]struct {