Add test for old issues

test/old-issues.js

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+import { promises as fs } from "fs";
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+
+import yuml2svg from "../index.mjs";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const inputDir = join(__dirname, "old_issues");
+
+export default fs.readdir(inputDir).then(files =>
+  Promise.all(
+    files
+      .filter(filename => filename.endsWith(".yuml"))
+      .map(filename => join(inputDir, filename))
+      .map(path =>
+        Promise.all([
+          fs
+            .readFile(path)
+            .then(input => yuml2svg(input))
+            .then(Buffer.from),
+          fs.readFile(path + ".svg"),
+        ]).then(([actualOutput, expectedOutput]) => {
+          if (Buffer.compare(actualOutput, expectedOutput) === 0) {
+            return Promise.resolve("Success");
+          } else {
+            return Promise.reject("An old bug file as been modified");
+          }
+        })
+      )
+  )
+);

test/old_issues/chinese-text-bug.yuml

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+// {type:state}
+{start}[start]->(你好!)

test/old_issues/class-notes-bug.yuml

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+// {type:class}
+// {direction:topDown}
+[note: You can stick notes on diagrams too!{bg:cornsilk}]
+[Customer]<>1-orders 0..*>[Order]
+[Order]-[note:asdf]