add deleting of content

exposed/src/test/kotlin/com/insanusmokrassar/postssystem/core/exposed/ExposedContentAPICommonTests.kt

@@ -13,7 +13,7 @@ class ExposedContentAPICommonTests {
 
     @Test
     fun `Test that it is possible to use several different databases at one time`() {
-        val numberOfDatabases = 2
+        val numberOfDatabases = 8
 
         val databaseFiles = (0 until numberOfDatabases).map {
             "$tempFolder/ExposedContentAPICommonTestsDB$it.db"
@@ -40,6 +40,11 @@ class ExposedContentAPICommonTests {
                         api.getContentById(content.id) == (if (i != j) null else content)
                     }
                 )
+                assert(
+                    runBlocking {
+                        api.deleteContent(content.id) == (i == j)
+                    }
+                )
             }
         }