Add tests for GraphHost/setTime(_:)

Author: Dark-Existed

Tests/OpenSwiftUITests/Core/Graph/GraphHostTests.swift

@@ -0,0 +1,24 @@
+//
+//  GraphHostTests.swift
+//  OpenSwiftUITests
+
+@testable import OpenSwiftUI
+import Testing
+
+struct GraphHostTests {
+    @Test
+    func setTimeTest() {
+        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)
+    }
+}