Fix GraphHost/setTime(_ time:) guard should be not equal. (#74)

* Fix GraphHost/setTime(_ time:) guard should be not equal.

* Add tests for GraphHost/setTime(_:)

* Fix GraphHostTests/setTime(_:) on Ubuntu

* Fix GraphHostTests on Ubuntu

Author: Dark-Existed

Sources/OpenSwiftUI/Core/Graph/GraphHost.swift

@@ -118,7 +118,7 @@ class GraphHost {
     final var graphInputs: _GraphInputs { data.inputs }
 
     final func setTime(_ time: Time) {
-        guard data.time == time else {
+        guard data.time != time else {
             return
         }
         data.time = time

Tests/OpenSwiftUITests/Core/Graph/GraphHostTests.swift

@@ -0,0 +1,27 @@
+//
+//  GraphHostTests.swift
+//  OpenSwiftUITests
+
+@testable import OpenSwiftUI
+import Testing
+
+struct GraphHostTests {
+    @Test
+    func setTimeTest() {
+        #if canImport(Darwin)
+        let graphHost = GraphHost(data: .init())
+        #expect(graphHost.data.time.seconds == 0.0)
+
+        graphHost.setTime(Time.zero)
+        #expect(graphHost.data.time.seconds == 0.0)
+
+        graphHost.setTime(Time.infinity)
+        #expect(graphHost.data.time.seconds == Time.infinity.seconds)
+        
+        let timeNow = Time.now
+        graphHost.setTime(timeNow)
+        #expect(graphHost.data.time.seconds == timeNow.seconds)
+        #endif
+    }
+}
+