diff --git a/lib/__snapshots__/vocabulary-builder.test.ts.snap b/lib/__snapshots__/vocabulary-builder.test.ts.snap
new file mode 100644
index 0000000..3ccddd8
--- /dev/null
+++ b/lib/__snapshots__/vocabulary-builder.test.ts.snap
@@ -0,0 +1,33 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`convertSvgMarkupToSymbolData() works with SVGs that just have a path and no specs 1`] = `
+Object {
+  "bbox": Object {
+    "x": Object {
+      "max": 692.249,
+      "min": 27.751,
+    },
+    "y": Object {
+      "max": 692.249,
+      "min": 27.751,
+    },
+  },
+  "layers": Array [
+    Object {
+      "children": Array [],
+      "props": Object {
+        "d": "M 360.000 29.751 C 542.791 29.751 690.249 177.209 690.249 360.000 C 690.249 542.791 542.791 690.249 360.000 690.249 C 177.209 690.249 29.751 542.791 29.751 360.000 C 29.751 177.209 177.209 29.751 360.000 29.751 Z",
+        "fill": "#ffffff",
+        "fillRule": "evenodd",
+        "stroke": "#000000",
+        "strokeLinecap": "round",
+        "strokeLinejoin": "round",
+        "strokeWidth": "4",
+      },
+      "tagName": "path",
+    },
+  ],
+  "name": "blarg",
+  "specs": undefined,
+}
+`;
diff --git a/lib/vocabulary-builder.test.ts b/lib/vocabulary-builder.test.ts
new file mode 100644
index 0000000..f1d36e4
--- /dev/null
+++ b/lib/vocabulary-builder.test.ts
@@ -0,0 +1,11 @@
+import { convertSvgMarkupToSymbolData } from "./vocabulary-builder";
+
+const CIRCLE = `<path fill="#ffffff" fill-rule="evenodd" stroke="#000000" stroke-width="4" stroke-linecap="round" stroke-linejoin="round" d="M 360.000 29.751 C 542.791 29.751 690.249 177.209 690.249 360.000 C 690.249 542.791 542.791 690.249 360.000 690.249 C 177.209 690.249 29.751 542.791 29.751 360.000 C 29.751 177.209 177.209 29.751 360.000 29.751 Z"/>`;
+
+describe("convertSvgMarkupToSymbolData()", () => {
+  it("works with SVGs that just have a path and no specs", () => {
+    expect(
+      convertSvgMarkupToSymbolData("blarg.svg", `<svg>${CIRCLE}</svg>`)
+    ).toMatchSnapshot();
+  });
+});
diff --git a/lib/vocabulary-builder.ts b/lib/vocabulary-builder.ts
index bb2f753..8ae5e23 100644
--- a/lib/vocabulary-builder.ts
+++ b/lib/vocabulary-builder.ts
@@ -82,6 +82,28 @@ function serializeSvgSymbolElement(
   throw new Error(`Unsupported SVG element: <${tagName}>`);
 }
 
+export function convertSvgMarkupToSymbolData(
+  filename: string,
+  svgMarkup: string
+): SvgSymbolData {
+  const name = path.basename(filename, SVG_EXT).toLowerCase();
+  const $ = cheerio.load(svgMarkup);
+  const svgEl = $("svg");
+  const rawLayers = onlyTags(svgEl.children()).map((ch) =>
+    serializeSvgSymbolElement($, ch)
+  );
+  const [specs, layers] = extractSpecs(rawLayers);
+  const bbox = getSvgBoundingBox(layers);
+
+  const symbol: SvgSymbolData = {
+    name,
+    bbox,
+    layers,
+    specs,
+  };
+  return symbol;
+}
+
 export function build() {
   const filenames = fs.readdirSync(SVG_DIR);
   const vocab: SvgSymbolData[] = [];
@@ -91,21 +113,7 @@ export function build() {
       const svgMarkup = fs.readFileSync(path.join(SVG_DIR, filename), {
         encoding: "utf-8",
       });
-      const $ = cheerio.load(svgMarkup);
-      const svgEl = $("svg");
-      const name = path.basename(filename, SVG_EXT).toLowerCase();
-      const rawLayers = onlyTags(svgEl.children()).map((ch) =>
-        serializeSvgSymbolElement($, ch)
-      );
-      const [specs, layers] = extractSpecs(rawLayers);
-      const bbox = getSvgBoundingBox(layers);
-
-      const symbol: SvgSymbolData = {
-        name,
-        bbox,
-        layers,
-        specs,
-      };
+      const symbol = convertSvgMarkupToSymbolData(filename, svgMarkup);
       vocab.push(symbol);
     }
   }