Reorganize tests by API and service concerns

RpgRoller.Tests/Services/DiceRulesTests.cs

@@ -0,0 +1,36 @@
+using RpgRoller.Services;
+
+namespace RpgRoller.Tests;
+
+public sealed class DiceRulesTests
+{
+    [Fact]
+    public void DiceRules_CoversParsingAndMappingBranches()
+    {
+        Assert.Equal(RulesetKind.D6, DiceRules.TryParseRulesetId("d6"));
+        Assert.Equal(RulesetKind.Dnd5e, DiceRules.TryParseRulesetId("dnd5e"));
+        Assert.Null(DiceRules.TryParseRulesetId("unknown"));
+
+        var d6 = DiceRules.ParseExpression(RulesetKind.D6, "5D+4");
+        var dnd = DiceRules.ParseExpression(RulesetKind.Dnd5e, "2d12+2");
+        var emptyExpression = DiceRules.ParseExpression(RulesetKind.Dnd5e, "");
+        var badFormat = DiceRules.ParseExpression(RulesetKind.Dnd5e, "abc");
+        var tooManyDice = DiceRules.ParseExpression(RulesetKind.D6, "51D+1");
+        var tooManySides = DiceRules.ParseExpression(RulesetKind.Dnd5e, "1d1001");
+        var tooLargeModifier = DiceRules.ParseExpression(RulesetKind.Dnd5e, "1d20+1001");
+        var unknownRulesetExpression = DiceRules.ParseExpression((RulesetKind)99, "1d20+1");
+
+        Assert.True(d6.Succeeded);
+        Assert.True(dnd.Succeeded);
+        Assert.False(emptyExpression.Succeeded);
+        Assert.False(badFormat.Succeeded);
+        Assert.False(tooManyDice.Succeeded);
+        Assert.False(tooManySides.Succeeded);
+        Assert.False(tooLargeModifier.Succeeded);
+        Assert.False(unknownRulesetExpression.Succeeded);
+
+        Assert.Equal("d6", DiceRules.ToRulesetId(RulesetKind.D6));
+        Assert.Equal("dnd5e", DiceRules.ToRulesetId(RulesetKind.Dnd5e));
+        Assert.Throws<ArgumentOutOfRangeException>(() => DiceRules.ToRulesetId((RulesetKind)99));
+    }
+}