Fix b annotation

Author: thymikee

__tests__/__snapshots__/snapshotDiff.test.js.snap

@@ -1,8 +1,8 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`can colorize diff 1`] = `
-"[32m- Second value[39m
-[31m+ Received[39m
+"[32m- First value[39m
+[31m+ Second value[39m
 
   
       some
@@ -20,8 +20,8 @@ exports[`can colorize diff 1`] = `
 `;
 
 exports[`can expand diff 1`] = `
-"- Second value
-+ Received
+"- First value
++ Second value
 
   
       some
@@ -39,8 +39,8 @@ exports[`can expand diff 1`] = `
 `;
 
 exports[`collapses diffs and strips ansi by default 1`] = `
-"- Second value
-+ Received
+"- First value
++ Second value
 
 @@ -5,8 +5,9 @@
      some
@@ -89,3 +89,13 @@ exports[`detects React components 1`] = `
    <span />
    <span />"
 `;
+
+exports[`diffs short strings 1`] = `
+"- First value
++ Second value
+
+ 
+-  abcx
++  abcy
+   "
+`;

__tests__/snapshotDiff.test.js

@@ -128,6 +128,16 @@ test('can colorize diff', () => {
   expect(snapshotDiff(a, b, {colors: true})).toMatchSnapshot();
 });
 
+test('diffs short strings', () => {
+  const x = `
+  abcx
+  `;
+  const y = `
+  abcy
+  `;
+  expect(snapshotDiff(x, y)).toMatchSnapshot();
+});
+
 test('detects React components', () => {
   expect(
     snapshotDiff(<Component test="say" />, <Component test="my name" />)

src/index.js

@@ -20,7 +20,7 @@ const snapshotDiff = (
   valueA: any,
   valueB: any,
   options?: Options = defaultOptions
-) => {
+): string => {
   let difference;
 
   if (isReactComponent(valueA) && isReactComponent(valueB)) {
@@ -43,7 +43,7 @@ function diffStrings(valueA, valueB, options) {
   return diff(valueA, valueB, {
     expand: options.expand,
     aAnnotation: 'First value',
-    aAnnotation: 'Second value'
+    bAnnotation: 'Second value'
   });
 }