Update error messages for dataset file validation

- Standardized terminology: replaced "Part File" with "Multipart file" and clarified references to "sourceName" of dataset parts.
- Adjusted integration tests and validation logic to reflect the updated error messages.

Author: jreynard-code

dataset/src/integrationTest/kotlin/com/cosmotech/dataset/service/DatasetServiceIntegrationTest.kt

@@ -409,7 +409,7 @@ class DatasetServiceIntegrationTest() : CsmTestBase() {
   }
 
   @Test
-  fun `test createDataset with two dataset part with same name`() {
+  fun `test createDataset with two dataset parts and same multipart file name`() {
 
     val customerPartName = "Customers list"
     val customerPartDescription = "List of customers"
@@ -464,8 +464,8 @@ class DatasetServiceIntegrationTest() : CsmTestBase() {
         }
     assertEquals(
         "Part File names should be unique during dataset creation. " +
-            "Files: [$CUSTOMER_SOURCE_FILE_NAME, $CUSTOMER_SOURCE_FILE_NAME]. " +
-            "Dataset Parts: [$CUSTOMER_SOURCE_FILE_NAME, anotherFile.txt].",
+            "Multipart file names: [$CUSTOMER_SOURCE_FILE_NAME, $CUSTOMER_SOURCE_FILE_NAME]. " +
+            "Dataset parts source names: [$CUSTOMER_SOURCE_FILE_NAME, anotherFile.txt].",
         exception.message)
   }
 
@@ -588,9 +588,9 @@ class DatasetServiceIntegrationTest() : CsmTestBase() {
               arrayOf(mockMultipartFile))
         }
     assertEquals(
-        "All files must have the same name as their corresponding Dataset Part. " +
-            "Files: [customers.csv]. " +
-            "Dataset Parts: [wrongname.csv].",
+        "All files must have the same name as corresponding sourceName in a Dataset Part. " +
+            "Multipart file names: [customers.csv]. " +
+            "Dataset parts source names: [wrongname.csv].",
         exception.message)
   }
 
@@ -1627,7 +1627,7 @@ class DatasetServiceIntegrationTest() : CsmTestBase() {
   }
 
   @Test
-  fun `test updateDataset with two dataset part with same name`() {
+  fun `test updateDataset with two dataset parts and same multipart file name`() {
 
     val initialDataset =
         datasetApiService.createDataset(
@@ -1689,9 +1689,9 @@ class DatasetServiceIntegrationTest() : CsmTestBase() {
               arrayOf(customerMockMultipartFile, customerMockMultipartFile2))
         }
     assertEquals(
-        "Part File names should be unique during dataset update. " +
-            "Files: [$CUSTOMER_SOURCE_FILE_NAME, $CUSTOMER_SOURCE_FILE_NAME]. " +
-            "Dataset Parts: [$CUSTOMER_SOURCE_FILE_NAME, anotherFile.txt].",
+        "Multipart file names should be unique during dataset update. " +
+            "Multipart file names: [$CUSTOMER_SOURCE_FILE_NAME, $CUSTOMER_SOURCE_FILE_NAME]. " +
+            "Dataset parts source names: [$CUSTOMER_SOURCE_FILE_NAME, anotherFile.txt].",
         exception.message)
   }
 

dataset/src/main/kotlin/com/cosmotech/dataset/service/DatasetServiceImpl.kt

@@ -685,15 +685,15 @@ class DatasetServiceImpl(
     require(
         files.groupingBy { it.originalFilename }.eachCount().filter { it.value > 1 }.isEmpty()) {
           "Part File names should be unique during dataset creation. " +
-              "Files: ${files.map { it.originalFilename }}. " +
-              "Dataset Parts: ${datasetCreateRequest.parts?.map { it.sourceName }}."
+              "Multipart file names: ${files.map { it.originalFilename }}. " +
+              "Dataset parts source names: ${datasetCreateRequest.parts?.map { it.sourceName }}."
         }
     require(
         files.mapNotNull { it.originalFilename }.toSortedSet(naturalOrder()) ==
             datasetCreateRequest.parts?.map { it.sourceName }?.toSortedSet(naturalOrder())) {
-          "All files must have the same name as their corresponding Dataset Part. " +
-              "Files: ${files.map { it.originalFilename }}. " +
-              "Dataset Parts: ${datasetCreateRequest.parts?.map { it.sourceName }}."
+          "All files must have the same name as corresponding sourceName in a Dataset Part. " +
+              "Multipart file names: ${files.map { it.originalFilename }}. " +
+              "Dataset parts source names: ${datasetCreateRequest.parts?.map { it.sourceName }}."
         }
     files.forEach { file ->
       require(
@@ -720,17 +720,17 @@ class DatasetServiceImpl(
     }
     require(
         files.groupingBy { it.originalFilename }.eachCount().filter { it.value > 1 }.isEmpty()) {
-          "Part File names should be unique during dataset update. " +
-              "Files: ${files.map { it.originalFilename }}. " +
-              "Dataset Parts: ${datasetUpdateRequest.parts?.map { it.sourceName }}."
+          "Multipart file names should be unique during dataset update. " +
+              "Multipart file names: ${files.map { it.originalFilename }}. " +
+              "Dataset parts source names: ${datasetUpdateRequest.parts?.map { it.sourceName }}."
         }
     require(
         files.mapNotNull { it.originalFilename }.toSortedSet(naturalOrder()) ==
             (datasetUpdateRequest.parts?.map { it.sourceName }?.toSortedSet(naturalOrder())
                 ?: emptySet<String>())) {
-          "All files must have the same name as their corresponding Dataset Part. " +
-              "Files: ${files.map { it.originalFilename }}. " +
-              "Dataset Parts: ${datasetUpdateRequest.parts?.map { it.sourceName } ?: emptyList()}."
+          "All files must have the same name as corresponding sourceName in a Dataset Part. " +
+              "Multipart file names: ${files.map { it.originalFilename }}. " +
+              "Dataset parts source names: ${datasetUpdateRequest.parts?.map { it.sourceName } ?: emptyList()}."
         }
 
     files.forEach { file ->