Get rid of redundant type.js tests and inclide them in each method testfile

test/b64.decode.js

@@ -2,6 +2,10 @@ import test from 'ava';
 import b64 from '../';
 import values from './fixtures/values';
 
+test('b64.decode is a function', t => {
+	t.is(typeof b64.decode, 'function');
+});
+
 test('b64.decode returns a Promise', t => {
 	const returnValue = b64.decode(values.string);
 	t.true(returnValue instanceof Promise);

test/b64.encode.js

@@ -2,6 +2,10 @@ import test from 'ava';
 import b64 from '../';
 import values from './fixtures/values';
 
+test('b64.encode is a function', t => {
+	t.is(typeof b64.encode, 'function');
+});
+
 test('b64.encode returns a Promise', t => {
 	const returnValue = b64.encode(values.buffer);
 	t.true(returnValue instanceof Promise);

test/b64.js

@@ -2,6 +2,10 @@ import test from 'ava';
 import b64 from '../';
 import values from './fixtures/values';
 
+test('b64 is a function', t => {
+	t.is(typeof b64, 'function');
+});
+
 test('b64 calls b64[opts.method]', async t => {
 	const encodeResult = await b64(values.buffer, { method: 'encode' });
 	const decodeResult = await b64(values.base64, { method: 'decode' });

test/types.js

@@ -1,10 +0,0 @@
-import test from 'ava';
-import b64 from '../';
-
-test('b64 is a function', t => {
-	t.is(typeof b64, 'function');
-});
-
-test('b64.encode is a function', t => {
-	t.is(typeof b64.encode, 'function');
-});