How to use a user defined config variable as module name in @testable import in a swift test?

Question

I have a user defined variable "MODULE_NAME_WITH_SUFFIX" that is different in every schema.

Now I need to import this module name in my tests, but don't know how.

Before I had a simple import:

@testable import MyApp

Now I want to use something like:

@testable import $(MODULE_NAME_WITH_SUFFIX)

Is this possible in Swift somehow?

Probably not, but is it maybe possible to import the module later programatically?

Answer 1

So far only this worked:

In the Build settings of your project go to Active Compilation Conditions and add these fields to the schemes.

Create one unique variable in each schema config:

# in debug scheme 1
DEBUG ABC_SCHEMA_ACTIVE

# in debug scheme 2
DEBUG XYZ_SCHEMA_ACTIVE

# in debug scheme 3
DEBUG

# in release scheme 1
ABC_SCHEMA_ACTIVE

# in release scheme 2
XYZ_SCHEMA_ACTIVE

# in release scheme 3
< nothing >

No need to set a value for it, with #if you cannot compare the value.

In the Build settings of the Test-Target you can use the MODULE_NAME_WITH_SUFFIX like this:

# before
TEST_HOST = "$(BUILT_PRODUCTS_DIR)/MyApp.app/MyApp";

# after
TEST_HOST = "$(BUILT_PRODUCTS_DIR)/$(MODULE_NAME_WITH_SUFFIX).app/$(MODULE_NAME_WITH_SUFFIX)";

Then in every class derived from XCTestCase, instead of the normal import you add this monster:

#if ABC_SCHEMA_ACTIVE
    @testable import MyAppABCSuffix
#elseif XYZ_SCHEMA_ACTIVE
    @testable import MyAppXYZSuffix
#else
    @testable import MyApp
#endif

Happy testing!