thats the normal single assert: ```
fun <T : Co...
# striktc
christophsturm
11/28/2018, 2:24 PMthats the normal single assert:
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fun <T : Collection<E>, E> Builder<T>.single(): Builder<E> {
assertThat("has only one element") { it.size == 1 }
return get("single element %s") { single() }
}