added array-based version of TestStore.assert (#115)

Author: pteasima

Sources/ComposableArchitecture/TestSupport/TestStore.swift

@@ -161,7 +161,16 @@
       file: StaticString = #file,
       line: UInt = #line
     ) {
-      var receivedActions: [Action] = []
+      assert(steps, file: file, line: line)
+    }
+    
+    /// Asserts against an array of actions.
+    public func assert(
+    _ steps: [Step],
+    file: StaticString = #file,
+    line: UInt = #line
+    ) {
+    var receivedActions: [Action] = []
 
       var cancellables: [AnyCancellable] = []