Starting Zig code generator with one test

internal/zig/zig_test.go

@@ -0,0 +1,55 @@
+package zig_test
+
+import (
+	"cmp"
+	"fmt"
+	"strings"
+	"testing"
+
+	"git.frop.prof/luke/go-zig-compiler/internal/zig"
+)
+
+func Expect[T cmp.Ordered](expected, actual T) error {
+	if expected != actual {
+		return fmt.Errorf("\nExpected: %v\nActual:   %v", expected, actual)
+	}
+	return nil
+}
+
+func TestHelloWorld(t *testing.T) {
+	expected := `//! Hello, world!
+
+fn main() void {
+return;
+}
+`
+
+	root := &zig.Root{
+		ContainerDocComment: "Hello, world!",
+		ContainerMembers: []*zig.ContainerMember{
+			{
+				Decls: []zig.Decl{
+					&zig.FnDecl{
+						Name:       "main",
+						ReturnType: "void",
+						Body: &zig.Block{
+							Stmts: []zig.Stmt{
+								&zig.ReturnStmt{},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	sb := new(strings.Builder)
+	err := zig.Write(sb, root)
+	if err != nil {
+		t.FailNow()
+	}
+	actual := sb.String()
+
+	if err = Expect(expected, actual); err != nil {
+		t.Error(err)
+	}
+}