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

Gathers all shared test code in single place.

tests/unit/shared/Stubs/PipeStub.ts

@@ -0,0 +1,19 @@
+import { IPipe } from '@/application/Parser/Script/Compiler/Expressions/Pipes/IPipe';
+
+export class PipeStub implements IPipe {
+  public name = 'pipeStub';
+
+  public apply(raw: string): string {
+    return raw;
+  }
+
+  public withName(name: string): PipeStub {
+    this.name = name;
+    return this;
+  }
+
+  public withApplier(applier: (input: string) => string): PipeStub {
+    this.apply = applier;
+    return this;
+  }
+}