Move stubs from ./stubs to ./shared/Stubs

Gathers all shared test code in single place.

tests/unit/shared/Stubs/ScriptCodeStub.ts

@@ -0,0 +1,17 @@
+import { IScriptCode } from '@/domain/IScriptCode';
+
+export class ScriptCodeStub implements IScriptCode {
+  public execute = 'default execute code';
+
+  public revert = 'default revert code';
+
+  public withExecute(code: string) {
+    this.execute = code;
+    return this;
+  }
+
+  public withRevert(revert: string) {
+    this.revert = revert;
+    return this;
+  }
+}