Created
August 12, 2024 09:31
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Test to demonstrate, that it's not possible to read a map which a generic value type as key.
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| package de.itscope.catalog.pricelist | |
| import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper | |
| import com.fasterxml.jackson.module.kotlin.readValue | |
| import com.fasterxml.jackson.module.kotlin.registerKotlinModule | |
| import org.junit.jupiter.api.Assertions.assertEquals | |
| import org.junit.jupiter.api.Test | |
| /** | |
| * Test to demonstrate, that it's not possible to read a map which a generic value type as key. | |
| */ | |
| class ParseValueClassTest { | |
| @JvmInline | |
| value class Index(val value: Int = 0) | |
| /** | |
| * Uses a value class ([Index]) as key. | |
| */ | |
| data class FooMapKey(val map: MutableMap<Index, Int> = mutableMapOf()) | |
| data class FooField(val index: Index) | |
| data class FooMapValue(val map: MutableMap<Int, Index> = mutableMapOf()) | |
| data class FooList(val list: MutableList<Index> = mutableListOf()) | |
| // This 2 tests will fail on Jackson-module-kotlin: `2.17.2` | |
| @Test | |
| fun parseFooMapTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooMapKey().apply { | |
| map[Index(1)] = 42 | |
| } | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooMapKey>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| @Test | |
| fun parseFooMapEmptyTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooMapKey() | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooMapKey>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| // This 4 other tests will pass: | |
| @Test | |
| fun parseIndexTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooField(Index(0)) | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooField>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| @Test | |
| fun parseFooListTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooList().apply { | |
| list.add(Index(42)) | |
| } | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooList>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| @Test | |
| fun parseFooListEmptyTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooList() | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooList>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| @Test | |
| fun parseFooMapValueTest() { | |
| val mapper = jacksonObjectMapper().registerKotlinModule() | |
| val foo = FooMapValue().apply { | |
| map[1] = Index(42) | |
| } | |
| val fooJson = mapper.writeValueAsString(foo) | |
| val readValue = mapper.readValue<FooMapValue>(fooJson) | |
| assertEquals(foo, readValue) | |
| } | |
| } |
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