diff --git a/par/md.test.ts b/par/md.test.ts
index 436708b..57af2b9 100644
--- a/par/md.test.ts
+++ b/par/md.test.ts
@@ -21,3 +21,26 @@ Deno.test({
     assertEquals(ren.render(res), "<h1>hello</h1>");
   },
 });
+
+Deno.test({
+  name: "should parse header with specific level",
+  fn: () => {
+    const par = new MarkdownParser();
+    assertEquals(ren.render(par.parse("# hello")), "<h1>hello</h1>");
+    assertEquals(ren.render(par.parse("## hello")), "<h2>hello</h2>");
+    assertEquals(ren.render(par.parse("### hello")), "<h3>hello</h3>");
+    assertEquals(ren.render(par.parse("#### hello")), "<h4>hello</h4>");
+    assertEquals(ren.render(par.parse("##### hello")), "<h5>hello</h5>");
+    assertEquals(ren.render(par.parse("###### hello")), "<h6>hello</h6>");
+  },
+});
+
+Deno.test({
+  name: "should parse header if line contains additional spaces",
+  fn: () => {
+    const par = new MarkdownParser();
+    assertEquals(ren.render(par.parse(" # hello")), "<h1>hello</h1>");
+    assertEquals(ren.render(par.parse("  # hello")), "<h1>hello</h1>");
+    assertEquals(ren.render(par.parse("   # hello")), "<h1>hello</h1>");
+  },
+});