diff --git a/test/__snapshots__/validate-options.test.js.snap b/test/__snapshots__/validate-options.test.js.snap
new file mode 100644
index 0000000..0577472
--- /dev/null
+++ b/test/__snapshots__/validate-options.test.js.snap
@@ -0,0 +1,49 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`validate options should throw an error on the "unknown" option with "/test/" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "[]" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "{"foo":"bar"}" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "{}" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "1" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "false" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "test" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
+
+exports[`validate options should throw an error on the "unknown" option with "true" value 1`] = `
+"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object {}"
+`;
diff --git a/test/validate-options.test.js b/test/validate-options.test.js
new file mode 100644
index 0000000..1a307e6
--- /dev/null
+++ b/test/validate-options.test.js
@@ -0,0 +1,56 @@
+import { getCompiler, compile } from './helpers';
+
+describe('validate options', () => {
+  const tests = {
+    unknown: {
+      success: [],
+      failure: [1, true, false, 'test', /test/, [], {}, { foo: 'bar' }],
+    },
+  };
+
+  function stringifyValue(value) {
+    if (
+      Array.isArray(value) ||
+      (value && typeof value === 'object' && value.constructor === Object)
+    ) {
+      return JSON.stringify(value);
+    }
+
+    return value;
+  }
+
+  async function createTestCase(key, value, type) {
+    it(`should ${
+      type === 'success' ? 'successfully validate' : 'throw an error on'
+    } the "${key}" option with "${stringifyValue(value)}" value`, async () => {
+      const compiler = getCompiler('normal-file.js', { [key]: value });
+
+      let stats;
+
+      try {
+        stats = await compile(compiler);
+      } finally {
+        if (type === 'success') {
+          expect(stats.hasErrors()).toBe(false);
+        } else if (type === 'failure') {
+          const {
+            compilation: { errors },
+          } = stats;
+
+          expect(errors).toHaveLength(1);
+          expect(() => {
+            throw new Error(errors[0].error.message);
+          }).toThrowErrorMatchingSnapshot();
+        }
+      }
+    });
+  }
+
+  for (const [key, values] of Object.entries(tests)) {
+    for (const type of Object.keys(values)) {
+      for (const value of values[type]) {
+        createTestCase(key, value, type);
+      }
+    }
+  }
+});