JavaScript/TypeScriptObject Type Check By User Defined Type Guard with Record Type
I wrote the following article before. When we want to access a property of an object, we must somehow tell the...
JavaScript/TypeScript
JavaScript/TypeScript
JavaScript/TypeScriptTypeScript input validation by Method Decorators
While I read a book on API Design Patterns, I found decorators were used in the examples. It looks like this. @ge...
JavaScript/TypeScriptTop-Level function cannot be stubbed if it is exported by an asterisk
A top-level function is not a part of an object. If we need to stub it, we need to have an object that has the target f...
JavaScript/TypeScriptTS2322 error when trying to add a property to an anonymous object
TS2322 error happens when trying to add a property to an anonymous object. Haven't you faced this case where you need t...
JavaScript/TypeScriptWhat is the difference between Stub and Mock
In a unit test, we need to replace a real behavior with a test object but the variable name is sometimes xxxxStub for m...
JavaScript/TypeScriptReduce the number of if-else and switch-case conditional clauses
Have you found a function is not readable because of lots of conditional clauses such as if-else or switch-case? It's t...
JavaScript/TypeScriptTypeScript Stub Date and timer friends functions with sinon
When Date class, timer friends functions like setTimeout, and setInterval are used in a function, we need to control th...
JavaScript/TypeScriptHow to determine test values for unit testing
Are you a beginner at unit testing? Are you not confident enough to choose the test cases? You are not alone. Let's lea...
JavaScript/TypeScriptTypeScript Stub Top Level function by Sinon
Functions called in a different function are not always class members. They are often top-level functions which are not...
JavaScript/TypeScriptHow to mock fs.readdir and fs.readFile for unit testing
Reading a directory to get a file list and then, loading the file one by one. You might have seen such a function. If i...