Add unit test project and some early tests

PluralKit.Tests/ProxyTagParserTests.cs

@@ -0,0 +1,77 @@
+#nullable enable
+using PluralKit.Bot;
+using PluralKit.Core;
+
+using Xunit;
+
+namespace PluralKit.Tests
+{
+    public class ProxyTagParserTests
+    {
+        private ProxyTagParser parser = new ProxyTagParser();
+        private ProxyMember[] members = {
+            new ProxyMember("Tagless"), 
+            new ProxyMember("John", new ProxyTag("[", "]")),
+            new ProxyMember("Curly", new ProxyTag("{", "}")),
+            new ProxyMember("Specific", new ProxyTag("{{", "}}")),
+            new ProxyMember("SuperSpecific", new ProxyTag("{{{", "}}}")),
+            new ProxyMember("Manytags", new ProxyTag("-", "-"), new ProxyTag("<", ">")),
+            new ProxyMember("Lopsided", new ProxyTag("-", "")),
+            new ProxyMember("Othersided", new ProxyTag("", "-"))
+        };
+
+        [Fact]
+        public void EmptyStringMatchesNothing() =>
+            Assert.False(parser.TryMatch(members, "", out _));
+
+        [Fact]
+        public void NullStringMatchesNothing() =>
+            Assert.False(parser.TryMatch(members, null, out _));
+
+        [Fact]
+        public void PlainStringMatchesNothing() =>
+            // Note that we have "Tagless" with no proxy tags
+            Assert.False(parser.TryMatch(members, "string without any of the tags", out _));
+
+        [Fact]
+        public void StringWithBasicTagsMatch() =>
+            Assert.True(parser.TryMatch(members, "[these are john's tags]", out _));
+
+        [Theory]
+        [InlineData("[these are john's tags]", "John")]
+        [InlineData("-lopsided tags on the left", "Lopsided")]
+        [InlineData("lopsided tags on the right-", "Othersided")]
+        public void MatchReturnsCorrectMember(string input, string expectedName)
+        {
+            parser.TryMatch(members, input, out var result);
+            Assert.Equal(expectedName, result.Member.Name);
+        }
+
+        [Fact]
+        public void MatchReturnsCorrectContent()
+        {
+            parser.TryMatch(members, "[these are john's tags]", out var result);
+            Assert.Equal("these are john's tags", result.Content);
+        }
+
+        [Theory]
+        [InlineData("{just curly}", "Curly", "just curly")]
+        [InlineData("{{getting deeper}}", "Specific", "getting deeper")]
+        [InlineData("{{{way too deep}}}", "SuperSpecific", "way too deep")]
+        [InlineData("{{unmatched brackets}}}", "Specific", "unmatched brackets}")]
+        [InlineData("{more unmatched brackets}}}}}", "Curly", "more unmatched brackets}}}}")]
+        public void MostSpecificTagsAreMatched(string input, string expectedName, string expectedContent)
+        {
+            Assert.True(parser.TryMatch(members, input, out var result));
+            Assert.Equal(expectedName, result.Member.Name);
+            Assert.Equal(expectedContent, result.Content);
+        }
+
+        [Theory]
+        [InlineData("")]
+        [InlineData("some text")]
+        [InlineData("{bogus tags, idk}")]
+        public void NoMembersMatchNothing(string input) => 
+            Assert.False(parser.TryMatch(new ProxyMember[]{}, input, out _));
+    }
+}