diff --git a/test/example/example.spec.ts b/test/example/example.spec.ts
deleted file mode 100644
index 8e37228..0000000
--- a/test/example/example.spec.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-/* eslint-disable @typescript-eslint/no-var-requires */
-
-import { describe } from 'mocha'
-import * as path from 'path'
-import testFixtures from '../testFixtures'
-const example = require('../../src/example')
-
-describe(`example`, function() {
-  testFixtures({
-    glob: path.join(__dirname, 'fixtures', '*.ts'),
-    transform: example,
-  })
-})
diff --git a/test/example/fixtures/fixture.ts b/test/example/fixture.ts
similarity index 100%
rename from test/example/fixtures/fixture.ts
rename to test/example/fixture.ts
diff --git a/test/index.spec.ts b/test/index.spec.ts
new file mode 100644
index 0000000..ce1e60d
--- /dev/null
+++ b/test/index.spec.ts
@@ -0,0 +1,18 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+
+import { describe } from 'mocha'
+import * as fs from 'fs'
+import * as path from 'path'
+import testFixtures from './testFixtures'
+
+const dirs = fs.readdirSync(__dirname)
+for (const dir of dirs) {
+  if (fs.statSync(path.join(__dirname, dir)).isDirectory()) {
+    describe(dir, function() {
+      testFixtures({
+        glob: path.join(__dirname, dir, '*.ts'),
+        transform: require(`../src/${dir}`),
+      })
+    })
+  }
+}
diff --git a/test/testFixtures.ts b/test/testFixtures.ts
index de5699d..cf24366 100644
--- a/test/testFixtures.ts
+++ b/test/testFixtures.ts
@@ -52,20 +52,23 @@ export default function textFixtures({
     it(path.basename(fixturePath).replace(/\.js$/, ''), function() {
       let source = input
       const position = source.indexOf('// position')
+      let selectionStart
+      let selectionEnd
       if (position >= 0) {
+        selectionStart = selectionEnd = position
         source = source.replace(/^\s*\/\/ position[^\r\n]*(\r\n?|\n)/gm, '')
-      }
-      let selectionStart = source.indexOf('/* selectionStart */')
-      let selectionEnd
-      if (selectionStart >= 0) {
-        source = source.replace('/* selectionStart */', '')
-        selectionEnd = source.indexOf('/* selectionEnd */')
-        if (selectionEnd < 0) {
-          throw new Error(
-            '/* selectionEnd */ must be given if /* selectionStart */ is'
-          )
+      } else {
+        selectionStart = source.indexOf('/* selectionStart */')
+        if (selectionStart >= 0) {
+          source = source.replace('/* selectionStart */', '')
+          selectionEnd = source.indexOf('/* selectionEnd */')
+          if (selectionEnd < 0) {
+            throw new Error(
+              '/* selectionEnd */ must be given if /* selectionStart */ is'
+            )
+          }
+          source = source.replace('/* selectionEnd */', '')
         }
-        source = source.replace('/* selectionEnd */', '')
       }
       if (selectionStart < 0) selectionStart = position
       if (selectionEnd < 0) selectionEnd = position
@@ -78,23 +81,29 @@ export default function textFixtures({
       const report = []
       const parser = fixture.parser || defaultParser
       const j = parser ? jscodeshift.withParser(parser) : jscodeshift
-      const result = transform(
-        { path: file, source },
-        {
-          j,
-          jscodeshift: j,
-          stats: (name: string, quantity = 1): void => {
-            const total = stats[name]
-            stats[name] = total != null ? total + quantity : quantity
+      const doTransform = (): string | null | void | undefined =>
+        transform(
+          { path: file, source },
+          {
+            j,
+            jscodeshift: j,
+            stats: (name: string, quantity = 1): void => {
+              const total = stats[name]
+              stats[name] = total != null ? total + quantity : quantity
+            },
+            report: (msg: string) => report.push(msg),
           },
-          report: (msg: string) => report.push(msg),
-        },
-        options
-      )
-      if (!result) expect(result).to.equal(fixture.expected)
-      else expect(normalize(result)).to.equal(normalize(expected))
-      if (fixture.stats) expect(stats).to.deep.equal(fixture.stats)
-      if (fixture.report) expect(report).to.deep.equal(fixture.report)
+          options
+        )
+      if (fixture.expectedError) {
+        expect(doTransform).to.throw(fixture.expectedError)
+      } else {
+        const result = doTransform()
+        if (!result) expect(result).to.equal(fixture.expected)
+        else expect(normalize(result)).to.equal(normalize(expected))
+        if (fixture.stats) expect(stats).to.deep.equal(fixture.stats)
+        if (fixture.report) expect(report).to.deep.equal(fixture.report)
+      }
     })
   }
 }