feat: add MySQL reader and writer

pkg/writers/mysql/writer_test.go

@@ -0,0 +1,37 @@
+package mysql
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+func TestWriterGeneratesMySQLDDL(t *testing.T) {
+	db := models.InitDatabase("app")
+	s := models.InitSchema("app")
+	table := models.InitTable("users", "app")
+	table.Columns["id"] = models.InitColumn("id", "users", "app")
+	table.Columns["id"].Type = "int"
+	table.Columns["id"].IsPrimaryKey = true
+	table.Columns["id"].NotNull = true
+	table.Columns["name"] = models.InitColumn("name", "users", "app")
+	table.Columns["name"].Type = "string"
+	table.Columns["name"].Length = 80
+	s.Tables = append(s.Tables, table)
+	db.Schemas = append(db.Schemas, s)
+	var out bytes.Buffer
+	w := NewWriter(&writers.WriterOptions{Metadata: map[string]interface{}{}})
+	w.writer = &out
+	if err := w.WriteDatabase(db); err != nil {
+		t.Fatal(err)
+	}
+	got := out.String()
+	for _, want := range []string{"CREATE TABLE IF NOT EXISTS `app`.`users`", "`id` INT NOT NULL", "`name` VARCHAR(80)", "PRIMARY KEY (`id`)"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("DDL missing %q:\n%s", want, got)
+		}
+	}
+}