When you write a Swift type, you should prefer to write its tests in Swift, too. In a mixed-language code base, you will run into the situation where your Objective-C tests need to reference Swift types to initialize and pass to the object under test. That’s a different story. But you cannot import the generated -Swift.h out-of-the-box:

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Two years ago, I wrote about how I implemented a toolbar with NSSegmentedControl, much like Apple’s own apps have them since macOS 10.11 Yosemite. Last week I discovered my implementation was buggy: it did not work at all when you customize the toolbar to show “Icon Only”, i.e. hide the label text.

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