diff --git a/src/config/type/Include.ts b/src/config/type/Include.ts
index d21df55..daa11ba 100644
--- a/src/config/type/Include.ts
+++ b/src/config/type/Include.ts
@@ -13,10 +13,15 @@ export const includeSchema = {
 export const includeType = new YamlType('!include', {
   kind: 'scalar',
   resolve(path: string) {
-    const canonical = resolvePath(path);
-    if (existsSync(canonical)) {
-      return true;
-    } else {
+    try {
+      const canonical = resolvePath(path);
+      // throws in node 11+
+      if (existsSync(canonical)) {
+        return true;
+      } else {
+        throw new NotFoundError('included file does not exist');
+      }
+    } catch (err) {
       throw new NotFoundError('included file does not exist');
     }
   },
diff --git a/test/config/TestConfig.ts b/test/config/TestConfig.ts
new file mode 100644
index 0000000..217747e
--- /dev/null
+++ b/test/config/TestConfig.ts
@@ -0,0 +1,17 @@
+import { expect } from 'chai';
+import { join } from 'path';
+
+import { loadConfig } from '../../src/config';
+import { NotFoundError } from '../../src/error/NotFoundError';
+import { describeLeaks, itLeaks } from '../helpers/async';
+
+describeLeaks('load config helper', async () => {
+  itLeaks('should load an existing config', async () => {
+    const config = await loadConfig('config-stderr.yml', join(__dirname, '..', 'docs'));
+    expect(config.data.logger.name).to.equal('salty-dog');
+  });
+
+  itLeaks('should throw when config is missing', async () => {
+    return expect(loadConfig('missing.yml', join(__dirname, '..', 'docs'))).to.eventually.be.rejectedWith(NotFoundError);
+  });
+});
diff --git a/test/config/type/TestEnv.ts b/test/config/type/TestEnv.ts
new file mode 100644
index 0000000..4c0bd8b
--- /dev/null
+++ b/test/config/type/TestEnv.ts
@@ -0,0 +1,22 @@
+import { expect } from 'chai';
+
+import { envType } from '../../../src/config/type/Env';
+import { NotFoundError } from '../../../src/error/NotFoundError';
+import { VERSION_INFO } from '../../../src/version';
+import { describeLeaks, itLeaks } from '../../helpers/async';
+
+describeLeaks('env config type', async () => {
+  itLeaks('should throw on missing variables', async () => {
+    expect(() => {
+      envType.resolve('DOES_NOT_EXIST_');
+    }).to.throw(NotFoundError);
+  });
+
+  itLeaks('should resolve existing variables', async () => {
+    expect(envType.resolve('CI_COMMIT_SHA')).to.equal(true);
+  });
+
+  itLeaks('should construct a value from variables', async () => {
+    expect(envType.construct('CI_COMMIT_SHA')).to.equal(VERSION_INFO.git.commit);
+  });
+});
diff --git a/test/config/type/TestInclude.ts b/test/config/type/TestInclude.ts
new file mode 100644
index 0000000..3025098
--- /dev/null
+++ b/test/config/type/TestInclude.ts
@@ -0,0 +1,31 @@
+import { expect } from 'chai';
+import { BaseError } from 'noicejs';
+import { join } from 'path';
+
+import { includeType } from '../../../src/config/type/Include';
+import { NotFoundError } from '../../../src/error/NotFoundError';
+import { describeLeaks, itLeaks } from '../../helpers/async';
+
+const TEST_ROOT = '../test/config/type';
+
+describeLeaks('include config type', async () => {
+  itLeaks('should resolve existing files', async () => {
+    expect(includeType.resolve(join(TEST_ROOT, 'include.yml'))).to.equal(true);
+  });
+
+  itLeaks('should throw when resolving missing files', async () => {
+    expect(() => {
+      includeType.resolve(join(TEST_ROOT, 'missing.yml'));
+    }).to.throw(NotFoundError);
+  });
+
+  itLeaks('should construct data from file', async () => {
+    expect(includeType.construct(join(TEST_ROOT, 'include.yml'))).to.equal('test');
+  });
+
+  itLeaks('should throw when constructing missing files', async () => {
+    expect(() => {
+      includeType.construct(join(TEST_ROOT, 'missing.yml'));
+    }).to.throw(BaseError);
+  });
+});
diff --git a/test/config/type/TestRegexp.ts b/test/config/type/TestRegexp.ts
new file mode 100644
index 0000000..9720197
--- /dev/null
+++ b/test/config/type/TestRegexp.ts
@@ -0,0 +1,19 @@
+import { expect } from 'chai';
+
+import { regexpType } from '../../../src/config/type/Regexp';
+import { describeLeaks, itLeaks } from '../../helpers/async';
+
+describeLeaks('regexp config type', async () => {
+  itLeaks('match slashed strings', async () => {
+    expect(regexpType.resolve('/foo/')).to.equal(true);
+  });
+
+  itLeaks('should match flags', async () => {
+    const regexp: RegExp = regexpType.construct('/foo/g');
+    expect(regexp.flags).to.equal('g');
+  });
+
+  itLeaks('should not match bare strings', async () => {
+    expect(regexpType.resolve('foo')).to.equal(false);
+  });
+});
diff --git a/test/config/type/include.yml b/test/config/type/include.yml
new file mode 100644
index 0000000..30d74d2
--- /dev/null
+++ b/test/config/type/include.yml
@@ -0,0 +1 @@
+test
\ No newline at end of file