Move scope benchmarks to its own suite. (#1314)

* Move scope benchmarks to its own suite.

* wip

* wip

(cherry picked from commit 08e119d57781ec277bbfec314a985db52b248598)

Author: mbrandonw

Sources/swift-composable-architecture-benchmark/StoreScope.swift

@@ -0,0 +1,25 @@
+import Benchmark
+import ComposableArchitecture
+
+let storeScopeSuite = BenchmarkSuite(name: "Store scoping") { suite in
+  let counterReducer = Reducer<Int, Bool, Void> { state, action, _ in
+    if action {
+      state += 1
+      return .none
+    } else {
+      state -= 1
+      return .none
+    }
+  }
+  var store = Store(initialState: 0, reducer: counterReducer, environment: ())
+  var viewStores: [ViewStore<Int, Bool>] = [ViewStore(store)]
+  for _ in 1...4 {
+    store = store.scope(state: { $0 })
+    viewStores.append(ViewStore(store))
+  }
+  let lastViewStore = viewStores.last!
+
+  suite.benchmark("Nested store") {
+    lastViewStore.send(true)
+  }
+}

Sources/swift-composable-architecture-benchmark/main.swift

@@ -1,45 +1,8 @@
 import Benchmark
 import ComposableArchitecture
 
-let counterReducer = Reducer<Int, Bool, Void> { state, action, _ in
-  if action {
-    state += 1
-  } else {
-    state = 0
-  }
-  return .none
-}
-
-let store1 = Store(initialState: 0, reducer: counterReducer, environment: ())
-let store2 = store1.scope { $0 }
-let store3 = store2.scope { $0 }
-let store4 = store3.scope { $0 }
-
-let viewStore1 = ViewStore(store1)
-let viewStore2 = ViewStore(store2)
-let viewStore3 = ViewStore(store3)
-let viewStore4 = ViewStore(store4)
-
-benchmark("Scoping (1)") {
-  viewStore1.send(true)
-}
-viewStore1.send(false)
-
-benchmark("Scoping (2)") {
-  viewStore2.send(true)
-}
-viewStore1.send(false)
-
-benchmark("Scoping (3)") {
-  viewStore3.send(true)
-}
-viewStore1.send(false)
-
-benchmark("Scoping (4)") {
-  viewStore4.send(true)
-}
-
 Benchmark.main([
   defaultBenchmarkSuite,
   effectSuite,
+  storeScopeSuite
 ])