Implement should().notBeConstantValueOf(x)

This CL adds the new assertion to audit; it checks if an array has
values other than the expected value. This is useful when checking
the non-zero array.

BUG=678695
TEST=
LayoutTests/webaudio/unit-tests/audit.html
LayoutTests/webaudio/unit-tests/audit-failures.html

Review-Url: https://codereview.chromium.org/2618053002
Cr-Commit-Position: refs/heads/master@{#442095}

third_party/WebKit/LayoutTests/webaudio/resources/audit.js

@@ -540,6 +540,47 @@ window.Audit = (function () {
       return this._assert(passed, passDetail, failDetail);
     }
 
+    /**
+     * Check if |actual| array is not filled with a constant |expected| value.
+     *
+     * @example
+     *   should([1, 0, 1]).notBeConstantValueOf(1);
+     *   should([0, 0, 0]).notBeConstantValueOf(0);
+     *
+     * @result
+     *   "PASS   [1,0,1] is not constantly 1 (contains 1 different value)."
+     *   "FAIL X [0,0,0] should have contain at least one value different
+     *     from 0."
+     */
+    notBeConstantValueOf () {
+      this._processArguments(arguments);
+      this._printActualForFailure = false;
+
+      let passed = true;
+      let passDetail;
+      let failDetail;
+      let differences = {};
+
+      for (let index in this._actual) {
+        if (this._actual[index] !== this._expected)
+          differences[index] = this._actual[index];
+      }
+
+      let numberOfDifferences = Object.keys(differences).length;
+      passed = numberOfDifferences > 0;
+
+      if (passed) {
+        let valueString = numberOfDifferences > 1 ? 'values' : 'value';
+        passDetail = '${actual} is not constantly ${expected} (contains ' +
+            numberOfDifferences + ' different ' + valueString + ').';
+      } else {
+        failDetail = '${actual} should have contain at least one value ' +
+            'different from ${expected}.';
+      }
+
+      return this._assert(passed, passDetail, failDetail);
+    }
+
     /**
      * Check if |actual| array is identical to |expected| array element-wise.
      *

third_party/WebKit/LayoutTests/webaudio/unit-tests/audit-expected.txt

@@ -4,10 +4,12 @@ PASS # AUDIT TASK RUNNER STARTED.
 PASS > [numerical] Numerical assertion unit test. 
 PASS   2.3 is 2 within an error of 0.3. 
 PASS   [1,1,1] contains only the constant 1. 
+PASS   [1,0,1] is not constantly 1 (contains 1 different value). 
+PASS   [1,0,0,1] is not constantly 1 (contains 2 different values). 
 PASS   [1,1,1] is identical to the array [1,1,1]. 
 PASS   [1,1,1,1,2,2,3,3,3] contains all the expected values in the correct order: one, two, three. 
 PASS   [0.5,0.5,0.55,0.5,0.45,0.5] has no glitch above the threshold of 0.06. 
-PASS < [numerical] All assertions passed. (total 5 assertions) 
+PASS < [numerical] All assertions passed. (total 7 assertions) 
 PASS > [basic] Simple unit tests for basic assertions. 
 PASS   OfflineAudioContext does exist. 
 PASS   Setting foo1 to 0 did not throw an exception. 

third_party/WebKit/LayoutTests/webaudio/unit-tests/audit-failures-expected.txt

@@ -26,6 +26,7 @@ FAIL X Expected 5 for all values but found 7 unexpected values:
 	[2]	11
 	[3]	18
 	...and 3 more errors. assert_true: expected true got false
+FAIL X [0,0,0] should have contain at least one value different from 0. assert_true: expected true got false
 FAIL X [1,8,11,18,6,5,5,5,123,49] expected to be equal to the array [1,8,10,18,6,5,6,5,123,48] but differs in 3 places:
 	Index	Actual			Expected
 	[2]	1.1000000000000000e+1	1.0000000000000000e+1
@@ -60,7 +61,7 @@ FAIL X [0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.9] does not equal [0.7,0.6,0.5,0.4,0.3,0.2
 	[5]	5.9999999999999998e-1	2.0000000000000001e-1	3.9999999999999997e-1	1.9999999999999998e+0	2.0000000000000004e-2
 	Max AbsError of 5.9999999999999998e-1 at index of 0.
 	Max RelError of 5.9999999999999991e+0 at index of 6. assert_true: expected true got false
-FAIL < [numerical-failures] 9 out of 9 assertions were failed. assert_true: expected true got false
+FAIL < [numerical-failures] 10 out of 10 assertions were failed. assert_true: expected true got false
 FAIL # AUDIT TASK RUNNER FINISHED: 2 out of 2 tasks were failed. assert_true: expected true got false
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/webaudio/unit-tests/audit-failures.html

@@ -51,6 +51,7 @@
       should(0).beCloseTo(0.1, { threshold: 0 });
       should(59, 'The measured decibel').beCloseTo(62, { threshold: 0.01 });
       should([1, 8, 11, 18, 6, 5, 5, 5, 123, 49]).beConstantValueOf(5);
+      should([0, 0, 0]).notBeConstantValueOf(0);
       should([1, 8, 11, 18, 6, 5, 5, 5, 123, 49])
         .beEqualToArray([1, 8, 10, 18, 6, 5, 6, 5, 123, 48]);
       should([1, 1, 1, 1, 2, 2, 3, 3, 3]).containValues([1, 3, 2]);

third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html

@@ -46,6 +46,8 @@
 
       should(2.3).beCloseTo(2, { threshold: 0.3 });
       should([1, 1, 1]).beConstantValueOf(1);
+      should([1, 0, 1]).notBeConstantValueOf(1);
+      should([1, 0, 0, 1]).notBeConstantValueOf(1);
       should([1, 1, 1]).beEqualToArray([1, 1, 1]);
       should([1, 1, 1, 1, 2, 2, 3, 3, 3])
         .containValues([1, 2, 3], 'one, two, three');