fix code coverage issues in tests

Author: vkarpov15

test/docs/validation.test.js

@@ -381,8 +381,9 @@ describe('validation docs', function() {
     err.errors['numWheels'].message;
     // acquit:ignore:start
     assert.equal(err.errors['numWheels'].name, 'CastError');
-    assert.equal(err.errors['numWheels'].message,
-      'Cast to Number failed for value "not a number" (type string) at path "numWheels"');
+    assert.ok(err.errors['numWheels'].message.startsWith(
+      'Cast to Number failed for value "not a number"')
+    );
     // acquit:ignore:end
   });
 

test/double.test.js

@@ -281,9 +281,10 @@ describe('Double', function() {
         assert.ok(err);
         assert.ok(err.errors['myDouble']);
         assert.equal(err.errors['myDouble'].name, 'CastError');
-        assert.equal(
-          err.errors['myDouble'].message,
-          'Cast to Double failed for value "helloworld" (type string) at path "myDouble"'
+        assert.ok(
+          err.errors['myDouble'].message.startsWith(
+            'Cast to Double failed for value "helloworld" (type string) at path "myDouble"'
+          )
         );
       });
     });

test/int32.test.js

@@ -301,9 +301,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "-42.4" (type number) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "-42.4" (type number) at path "myInt"'
+          )
         );
       });
     });
@@ -319,9 +320,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "helloworld" (type string) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "helloworld" (type string) at path "myInt"'
+          )
         );
       });
     });
@@ -337,9 +339,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "1.2" (type string) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "1.2" (type string) at path "myInt"'
+          )
         );
       });
     });
@@ -355,9 +358,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "NaN" (type number) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "NaN" (type number) at path "myInt"'
+          )
         );
       });
     });
@@ -373,9 +377,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "2147483648" (type number) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "2147483648" (type number) at path "myInt"'
+          )
         );
       });
     });
@@ -391,9 +396,10 @@ describe('Int32', function() {
         assert.ok(err);
         assert.ok(err.errors['myInt']);
         assert.equal(err.errors['myInt'].name, 'CastError');
-        assert.equal(
-          err.errors['myInt'].message,
-          'Cast to Int32 failed for value "-2147483649" (type number) at path "myInt"'
+        assert.ok(
+          err.errors['myInt'].message.startsWith(
+            'Cast to Int32 failed for value "-2147483649" (type number) at path "myInt"'
+          )
         );
       });
     });

test/model.findOneAndUpdate.test.js

@@ -1354,8 +1354,9 @@ describe('model: findOneAndUpdate:', function() {
       const update = { $push: { addresses: { street: 'not a num' } } };
       const error = await Person.findOneAndUpdate({}, update).then(() => null, err => err);
       assert.ok(error.message.indexOf('street') !== -1);
-      assert.equal(error.reason.message,
-        'Cast to Number failed for value "not a num" (type string) at path "street"');
+      assert.ok(error.reason.message.startsWith(
+        'Cast to Number failed for value "not a num" (type string) at path "street"')
+      );
     });
 
     it('projection option as alias for fields (gh-4315)', async function() {