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src/ol/AssertionError.js

@@ -72,7 +72,7 @@ class AssertionError extends Error {
    * @param {number} code Error code.
    */
   constructor(code) {
-    const message = `Assertion failed. ${messages[code]}.`;
+    const message = messages[code];
 
     super(message);
 

test/node/ol/AssertionError.test.js

@@ -9,9 +9,7 @@ describe('ol/AssertionError.js', function () {
 
   it('generates a message with a versioned url', function () {
     const error = new AssertionError(42);
-    expect(error.message).to.be(
-      'Assertion failed. Question unknown, the answer is 42.'
-    );
+    expect(error.message).to.be('Question unknown, the answer is 42');
   });
 
   it('has an error code', function () {