Add tests for union and match expressions codegen.

source/Compiler.Tests.Unit/Emit/UnionAndMatchExpressionTests.cs

@@ -0,0 +1,155 @@
+using FluentLang.TestUtils;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace FluentLang.Compiler.Tests.Unit.Emit
+{
+	public class UnionAndMatchExpressionTests : TestBase
+	{
+		public UnionAndMatchExpressionTests(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
+		{
+		}
+
+		[Fact]
+		public void MatchesCorrectly1()
+		{
+			CreateAssembly(@"
+Main() : int {
+	let u : int | {} = 42;
+	return u match { x : int => x; {} => 41; };
+}")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly2()
+		{
+			CreateAssembly(@"
+Main() : int {
+	let u : int | {} = 42;
+	return u match { {} => 41;  x : int => x; };
+}")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly3()
+		{
+			CreateAssembly(@"
+Main() : int {
+	let u : {} | int = 42;
+	return u match { x : int => x; {} => 41; };
+}")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly4()
+		{
+			CreateAssembly(@"
+Main() : int {
+	let u : int | {} = 42;
+	return u match { int => 42; {} => 41; };
+}")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly5()
+		{
+			CreateAssembly(@"
+Main() : int {
+	let u1 : int | {} = 42;
+	let u2 : int | {} | string = u1;
+	return u2 match { int => 42; {} => 41; string => 40; };
+}")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly6()
+		{
+			CreateAssembly(@"
+Main() : int {
+	
+	let u : { M1(): int; } | { M2(): int; } = {} + M1, M2;
+	return u match { {} => 42; };
+}
+
+M1(a : {}) : int { return 42; }
+M2(a : {}) : int { return 42; }")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly7()
+		{
+			CreateAssembly(@"
+Main() : int {
+	
+	let u : { M1(): int; } | { M2(): int; } = {} + M1, M2;
+	return u match { { M1(): int; } => 42; { M2(): int; } => 41; }
+}
+
+M1(a : {}) : int { return 42; }
+M2(a : {}) : int { return 42; }")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly8()
+		{
+			CreateAssembly(@"
+Main() : int {
+	
+	let u : { M1(): int; } | { M2(): int; } = {} + M1, M2;
+	return u match { { M2(): int; } => 42; { M1(): int; } => 41; }
+}
+
+M1(a : {}) : int { return 42; }
+M2(a : {}) : int { return 42; }")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly9()
+		{
+			CreateAssembly(@"
+Main() : int {
+	
+	let u1 : { M1(): int; } | { M2(): int; } = {} + M1, M2;
+	let u2 : { M1(): int; } | { M2(): int; } | int = u1;
+	return u2 match { { M2(): int; } => 42; { M1(): int; } => 41; int => 40; }
+}
+
+M1(a : {}) : int { return 42; }
+M2(a : {}) : int { return 42; }")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+
+		[Fact]
+		public void MatchesCorrectly10()
+		{
+			CreateAssembly(@"
+Main() : int {
+	
+	let u : { M1(): int; } | { M2(): int; } = {} + M1, M2;
+	return u match { x : { M2(): int; } => x.M2(); x : { M1(): int; } => x.M1(); }
+}
+
+M1(a : {}) : int { return 42; }
+M2(a : {}) : int { return 42; }")
+	.VerifyDiagnostics()
+	.VerifyEmit(expectedResult: 42);
+		}
+	}
+}