Resolve WES-187 "Unit tests account and system"

Assets/Accounts/Tests/EditMode/UserCreationScreenTests.cs

@@ -0,0 +1,33 @@
+using NUnit.Framework;
+
+/// <summary>
+/// Test the UserCreationScreen class
+/// </summary>
+[TestFixture]
+public class UserCreationScreenTests
+{
+    /// <summary>
+    /// Tets IsValidUsername will return <c>true</c> for an valid username
+    /// </summary>
+    [Test]
+    public void Test_UserCreationScreen_IsValidUsername_True()
+    {
+        foreach (char c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+            Assert.IsTrue(UserCreationScreen.IsValidUsername(c.ToString()));
+
+        Assert.IsTrue(UserCreationScreen.IsValidUsername("123456789AbC"));
+    }
+
+    /// <summary>
+    /// Tets IsValidUsername will return <c>false</c> for an invalid username
+    /// </summary>
+    [Test]
+    public void Test_UserCreationScreen_IsValidUsername_False()
+    {
+        Assert.IsFalse(UserCreationScreen.IsValidUsername(string.Empty));
+        foreach (char c in " \n\t+-*/%_.,;:!?(){}[]\\'\"|&~^$")
+            Assert.IsFalse(UserCreationScreen.IsValidUsername(c.ToString()));
+
+        Assert.IsFalse(UserCreationScreen.IsValidUsername("123456789_10_11_12_13"));
+    }
+}