diff --git a/GeminiRendererTests/GeminiHTMLRendererTests.swift b/GeminiRendererTests/GeminiHTMLRendererTests.swift
new file mode 100644
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--- /dev/null
+++ b/GeminiRendererTests/GeminiHTMLRendererTests.swift
@@ -0,0 +1,101 @@
+//
+//  GeminiHTMLRendererTests.swift
+//  GeminiRendererTests
+//
+//  Created by Shadowfacts on 10/1/21.
+//
+
+import XCTest
+import GeminiFormat
+@testable import GeminiRenderer
+
+class GeminiHTMLRendererTests: XCTestCase {
+    
+    private var doc: Document!
+
+    override func setUp() {
+        doc = Document(url: URL(string: "gemini://example.com/")!)
+    }
+    
+    func testEscapeToEntities() {
+        doc.lines = [.text("<b>hello</b>")]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<p>&#x3C;b&#x3E;hello&#x3C;/b&#x3E;</p>")
+    }
+
+    func testParagraph() {
+        doc.lines = [.text("Hello, world!")]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<p>Hello, world!</p>")
+    }
+    
+    func testLink() {
+        doc.lines = [.link(URL(string: "gemini://example.com/")!, text: "text")]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<p class=\"link\"><a href=\"gemini://example.com/\">text</a></p>")
+        
+        doc.lines = [.link(URL(string: "gemini://example.com/")!, text: nil)]
+        let noText = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(noText, "<p class=\"link\"><a href=\"gemini://example.com/\">gemini://example.com/</a></p>")
+    }
+    
+    func testDisableLinkClass() {
+        doc.lines = [.link(URL(string: "gemini://example.com/")!, text: "test")]
+        let renderer = GeminiHTMLRenderer()
+        renderer.addLinkClass = false
+        let html = renderer.renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<p><a href=\"gemini://example.com/\">test</a></p>")
+    }
+    
+    func testPreformatting() {
+        doc.lines = [
+            .preformattedToggle(alt: nil),
+            .preformattedText("foo"),
+            .preformattedText("* bar"),
+            .preformattedToggle(alt: nil),
+        ]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<pre>foo\n* bar\n</pre>")
+    }
+    
+    func testHeading() {
+        doc.lines = [
+            .heading("One", level: .h1),
+            .heading("Two", level: .h2),
+        ]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<h1 id=\"l0\">One</h1><h2 id=\"l1\">Two</h2>")
+    }
+    
+    func testDisableHeadingIDs() {
+        doc.lines = [
+            .heading("One", level: .h1),
+            .heading("Two", level: .h2),
+        ]
+        let renderer = GeminiHTMLRenderer()
+        renderer.addHeadingLineIDs = false
+        let html = renderer.renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<h1>One</h1><h2>Two</h2>")
+    }
+    
+    func testUnorderedList() {
+        doc.lines = [
+            .text("before"),
+            .unorderedListItem("a"),
+            .unorderedListItem("b"),
+            .unorderedListItem("c"),
+            .text("after"),
+        ]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<p>before</p><ul><li>a</li><li>b</li><li>c</li></ul><p>after</p>")
+    }
+    
+    func testQuote() {
+        doc.lines = [
+            .quote("quoted")
+        ]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<blockquote>quoted</blockquote>")
+    }
+
+}