Function TestMatchCodeGen_MatchExpression

pkg/codegen/match_test.go:280–328

TestMatchCodeGen_MatchExpression tests IIFE generation for match expressions.

(t *testing.T)

// TestMatchCodeGen_MatchExpression tests IIFE generation for match expressions.
func TestMatchCodeGen_MatchExpression(t *testing.T) {
	match := &ast.MatchExpr{
		Match: 1,
		Scrutinee: &ast.RawExpr{
			Text: "result",
		},
		Arms: []*ast.MatchArm{
			{
				Pattern: &ast.ConstructorPattern{
					Name: "Ok",
					Params: []ast.Pattern{
						&ast.VariablePattern{Name: "value"},
					},
				},
				Body: &ast.RawExpr{Text: "value"},
			},
			{
				Pattern: &ast.ConstructorPattern{
					Name: "Err",
					Params: []ast.Pattern{
						&ast.VariablePattern{Name: "e"},
					},
				},
				Body: &ast.RawExpr{Text: "0"},
			},
		},
		IsExpr: true, // This is an expression
	}

	gen := NewMatchCodeGen(match).(*MatchCodeGen)
	result := gen.Generate()

	code := string(result.Output)

	// Should wrap in IIFE
	if !strings.Contains(code, "func()") {
		t.Errorf("Expected IIFE wrapper 'func()', got: %s", code)
	}

	// Should have immediate invocation
	if !strings.Contains(code, "}()") {
		t.Errorf("Expected IIFE invocation '}()', got: %s", code)
	}

	// Should have return statements
	if !strings.Contains(code, "return") {
		t.Errorf("Expected return statements in IIFE, got: %s", code)
	}
}

// TestMatchCodeGen_EmptyMatch tests handling of empty match expression.
func TestMatchCodeGen_EmptyMatch(t *testing.T) {