[test] handling null or invalid market detail response #254

This commit introduces a new test suite `MarketDetailDtoMapperKtTest` to specifically address scenarios where the market detail response might contain null or invalid data.

**Key changes:**

*   Added test cases to handle `null` values for `id`, `name`, and `marketCapRank` in the `MarketDetailResponse`.
*   Added test cases to handle `null` `marketData` within `MarketDetailResponse`.
*   Added test cases to handle `null` fields within `marketData` like `high24h`, `low24h`, `marketCap`, and `marketCapRank`.
*   Added test cases for handling negative and zero values in market data.
*   Refactored test assertions to compare against expected default values when `null` is present.
*   Implemented custom `shouldBeEqual` functions for more readable assertions.
*   These test cases ensure the robustness of the mapping logic, especially when dealing with incomplete or faulty external data.
*   The new test cases verify that default values are assigned properly when data is null.
*   The new test cases verify that zero values and negative values are handled properly.
* The test cases ensures the response will be associated with the request.

data/market-repository/src/test/java/ir/composenews/data/mapper/MarketDetailDtoMapperKtTest.kt

@@ -0,0 +1,110 @@
+package ir.composenews.data.mapper
+
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+import ir.composenews.domain.model.MarketDetail
+import ir.composenews.remotedatasource.dto.MarketDetailResponse
+
+class MarketDetailDtoMapperKtTest : StringSpec({
+    "Given valid market detail response, When converting to market detail, Then returns correct market detail" {
+        val marketDetailResponse = MarketDetailResponse(
+            id = "bitcoin",
+            name = "Bitcoin",
+            marketCapRank = 1,
+            marketData = MarketDetailResponse.MarketData(
+                high24h = MarketDetailResponse.MarketData.High24h(60000.0),
+                low24h = MarketDetailResponse.MarketData.Low24h(55000.0),
+                marketCap = MarketDetailResponse.MarketData.MarketCap(1000000000L),
+                marketCapRank = 1,
+            ),
+        )
+
+        val marketDetail = marketDetailResponse.toMarketDetail()
+
+        marketDetail shouldBeEqual marketDetailResponse
+    }
+
+    "Given market detail response with null values, When converting to market detail, Then returns default values" {
+        val marketDetailResponse = MarketDetailResponse(
+            id = null,
+            name = null,
+            marketCapRank = null,
+            marketData = null,
+        )
+
+        val marketDetail = marketDetailResponse.toMarketDetail()
+
+        marketDetail shouldBeEqual marketDetailResponse
+    }
+
+    "Given market detail response with null market data, When converting to market detail, Then returns null market data" {
+        val marketDetailResponse = MarketDetailResponse(
+            id = "ethereum",
+            name = "Ethereum",
+            marketCapRank = 2,
+            marketData = null,
+        )
+
+        val marketDetail = marketDetailResponse.toMarketDetail()
+
+        marketDetail shouldBeEqual marketDetailResponse
+    }
+
+    "Given market data with null fields, When converting to market detail, Then assigns default values" {
+        val marketData = MarketDetailResponse.MarketData(
+            high24h = null,
+            low24h = null,
+            marketCap = null,
+            marketCapRank = null,
+        )
+
+        val convertedMarketData = marketData.toMarketData()
+
+        convertedMarketData shouldBeEqual marketData
+    }
+
+    "Given market data with negative values, When converting to market detail, Then preserves values" {
+        val marketData = MarketDetailResponse.MarketData(
+            high24h = MarketDetailResponse.MarketData.High24h(-60000.0),
+            low24h = MarketDetailResponse.MarketData.Low24h(-55000.0),
+            marketCap = MarketDetailResponse.MarketData.MarketCap(-1000000000L),
+            marketCapRank = -1,
+        )
+
+        val convertedMarketData = marketData.toMarketData()
+
+        convertedMarketData shouldBeEqual marketData
+    }
+
+    "Given market detail response with zero values, When converting to market detail, Then assigns zero values" {
+        val marketDetailResponse = MarketDetailResponse(
+            id = "dogecoin",
+            name = "Dogecoin",
+            marketCapRank = 0,
+            marketData = MarketDetailResponse.MarketData(
+                high24h = MarketDetailResponse.MarketData.High24h(0.0),
+                low24h = MarketDetailResponse.MarketData.Low24h(0.0),
+                marketCap = MarketDetailResponse.MarketData.MarketCap(0L),
+                marketCapRank = 0,
+            ),
+        )
+
+        val marketDetail = marketDetailResponse.toMarketDetail()
+
+        marketDetail shouldBeEqual marketDetailResponse
+    }
+})
+
+private infix fun MarketDetail.shouldBeEqual(expected: MarketDetailResponse) {
+    id shouldBe (expected.id ?: "")
+    name shouldBe (expected.name ?: "")
+    marketCapRank shouldBe (expected.marketCapRank ?: 0)
+    marketData?.shouldBeEqual(expected.marketData)
+}
+
+private infix fun MarketDetail.MarketData.shouldBeEqual(expected: MarketDetailResponse.MarketData?) {
+    high24hUSD shouldBe (expected?.high24h?.usd ?: 0.0)
+    low24hUSD shouldBe (expected?.low24h?.usd ?: 0.0)
+    marketCapUSD shouldBe (expected?.marketCap?.usd ?: 0L)
+    marketCapRank shouldBe (expected?.marketCapRank ?: 0)
+}