Revert "remove tested exports (included in aqua testset)"

This reverts commit e7053a8.

Author: lkdvos

test/test_exports.jl

@@ -0,0 +1,20 @@
+using SparseArraysBase: SparseArraysBase
+using Test: @test, @testset
+@testset "Test exports" begin
+  exports = [
+    :SparseArraysBase,
+    :SparseArrayDOK,
+    :SparseMatrixDOK,
+    :SparseVectorDOK,
+    :OneElementArray,
+    :OneElementMatrix,
+    :OneElementVector,
+    :eachstoredindex,
+    :isstored,
+    :oneelementarray,
+    :storedlength,
+    :storedpairs,
+    :storedvalues,
+  ]
+  @test issetequal(names(SparseArraysBase), exports)
+end