From 09b07992d4316899ee6878585622c0762588a82a Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Mon, 12 Aug 2019 16:14:57 +0800
Subject: Add username validator.

---
 Timeline.Tests/UsernameValidatorUnitTest.cs | 86 +++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Timeline.Tests/UsernameValidatorUnitTest.cs

(limited to 'Timeline.Tests/UsernameValidatorUnitTest.cs')

diff --git a/Timeline.Tests/UsernameValidatorUnitTest.cs b/Timeline.Tests/UsernameValidatorUnitTest.cs
new file mode 100644
index 00000000..97d56195
--- /dev/null
+++ b/Timeline.Tests/UsernameValidatorUnitTest.cs
@@ -0,0 +1,86 @@
+using FluentAssertions;
+using System;
+using Timeline.Services;
+using Xunit;
+
+namespace Timeline.Tests
+{
+    public class UsernameValidatorUnitTest : IClassFixture<UsernameValidator>
+    {
+        private readonly UsernameValidator _validator;
+
+        public UsernameValidatorUnitTest(UsernameValidator validator)
+        {
+            _validator = validator;
+        }
+
+        [Fact]
+        public void NullShouldThrow()
+        {
+            _validator.Invoking(v => v.Validate(null, out string message)).Should().Throw<ArgumentNullException>();
+        }
+
+
+        private string FailAndMessage(string username)
+        {
+            var result = _validator.Validate(username, out var message);
+            result.Should().BeFalse();
+            return message;
+        }
+
+        private void Succeed(string username)
+        {
+            _validator.Validate(username, out var message).Should().BeTrue();
+            message.Should().BeNull();
+        }
+
+        [Fact]
+        public void Empty()
+        {
+            FailAndMessage("").Should().ContainEquivalentOf("empty");
+        }
+
+        [Fact]
+        public void WhiteSpace()
+        {
+            FailAndMessage(" ").Should().ContainEquivalentOf("whitespace");
+            FailAndMessage("\t").Should().ContainEquivalentOf("whitespace");
+            FailAndMessage("\n").Should().ContainEquivalentOf("whitespace");
+
+            FailAndMessage("a b").Should().ContainEquivalentOf("whitespace");
+            FailAndMessage("a\tb").Should().ContainEquivalentOf("whitespace");
+            FailAndMessage("a\nb").Should().ContainEquivalentOf("whitespace");
+        }
+
+        [Fact]
+        public void BadCharactor()
+        {
+            FailAndMessage("!").Should().ContainEquivalentOf("regex");
+            FailAndMessage("!abc").Should().ContainEquivalentOf("regex");
+            FailAndMessage("ab!c").Should().ContainEquivalentOf("regex");
+        }
+
+        [Fact]
+        public void BadBegin()
+        {
+            FailAndMessage("-").Should().ContainEquivalentOf("regex");
+            FailAndMessage("-abc").Should().ContainEquivalentOf("regex");
+        }
+
+        [Fact]
+        public void TooLong()
+        {
+            FailAndMessage(new string('a', 40)).Should().ContainEquivalentOf("long");
+        }
+
+        [Fact]
+        public void Success()
+        {
+            Succeed("abc");
+            Succeed("_abc");
+            Succeed("a-bc");
+            Succeed("a-b-c");
+            Succeed("a-b_c");
+        }
+    }
+}
-- 
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