custom matchers allows substrings if argument is not Error object

Author: teogeb

packages/sdk/test/test-utils/customMatchers.ts

@@ -65,8 +65,13 @@ const createAssertionErrors = (
         if (actualError.code !== expectedError.code) {
             assertionErrors.push(formErrorMessage('code', expectedError.code, actualError.code))
         }
-        if ((expectedError.message !== undefined) && (actualError.message !== expectedError.message)) {
-            assertionErrors.push(formErrorMessage('message', expectedError.message, actualError.message))
+        if (expectedError.message !== undefined) {
+            const isMatch = (expectedError instanceof Error)
+                ? (actualError.message === expectedError.message)
+                : actualError.message.includes(expectedError.message)
+            if (!isMatch) {
+                assertionErrors.push(formErrorMessage('message', expectedError.message, actualError.message))
+            }
         }
     }
     return assertionErrors