Only include diff when objects are not equal

modules/Expectation.js

@@ -15,18 +15,6 @@ import {
   stringContains
 } from './TestUtils'
 
-const addErrorInfo = (actual, expected, callback) => {
-  try {
-    callback()
-  } catch (error) {
-    // These attributes are consumed by Mocha to produce a diff output.
-    error.actual = actual
-    error.expected = expected
-    error.showDiff = true
-    throw error
-  }
-}
-
 /**
  * An Expectation is a wrapper around an assertion that allows it to be written
  * in a more natural style, without the need to remember the order of arguments.
@@ -85,27 +73,31 @@ class Expectation {
   }
 
   toEqual(value, message) {
-    addErrorInfo(this.actual, value, () => {
+    try {
       assert(
         isEqual(this.actual, value),
         (message || 'Expected %s to equal %s'),
         this.actual,
         value
       )
-    })
+    } catch (error) {
+      // These attributes are consumed by Mocha to produce a diff output.
+      error.actual = this.actual
+      error.expected = value
+      error.showDiff = true
+      throw error
+    }
 
     return this
   }
 
   toNotEqual(value, message) {
-    addErrorInfo(this.actual, value, () => {
-      assert(
-        !isEqual(this.actual, value),
-        (message || 'Expected %s to not equal %s'),
-        this.actual,
-        value
-      )
-    })
+    assert(
+      !isEqual(this.actual, value),
+      (message || 'Expected %s to not equal %s'),
+      this.actual,
+      value
+    )
 
     return this
   }