add unit test for create new state in state usecase and add create st…

src/main/kotlin/logic/repositories/StateRepository.kt

@@ -3,9 +3,9 @@ package com.berlin.logic.repositories
 import com.berlin.model.State
 
 interface StateRepository {
-    fun createState(state: State):Boolean
-    fun getStatesByProjectId(projectId:String):List<State>
-    fun deleteState(stateId:String):Boolean
-    fun updateState(state: State):Boolean
-    fun getStateByTaskId(taskId:String):State?
+    fun addState(state: State): Result<String>
+    fun getStatesByProjectId(projectId: String):List<State>
+    fun deleteState(stateId: String): Result<String>
+    fun updateState(state: State): Result<String>
+    fun getStateByTaskId(taskId: String): State?
 }

src/main/kotlin/logic/usecase/StateUseCase.kt

@@ -0,0 +1,14 @@
+package com.berlin.logic.usecase
+
+import com.berlin.logic.repositories.StateRepository
+import com.berlin.model.State
+
+class StateUseCase(
+    private val stateRepository: StateRepository
+) {
+    fun createNewState(state: State): Boolean {
+        return false
+    }
+
+
+}

src/main/kotlin/model/State.kt

@@ -1,7 +1,7 @@
 package com.berlin.model
 
 data class State(
-    val id:String,
-    val name:String,
-    val projectId:String,
+    val id: String,
+    val name: String,
+    val projectId: String,
 )

src/test/kotlin/helper/createStateHelper.kt

@@ -0,0 +1,11 @@
+package com.berlin.helper
+
+import com.berlin.model.State
+
+fun createStateHelper(
+    id: String = "1", name: String = "TODO", projectId: String = "1"
+): State {
+    return State(
+        id = id, name = name, projectId = projectId
+    )
+}

src/test/kotlin/logic/usecase/StateUseCaseTest.kt

@@ -0,0 +1,51 @@
+package com.berlin.logic.usecase
+
+import com.berlin.helper.createStateHelper
+import com.berlin.logic.repositories.StateRepository
+import com.google.common.truth.Truth.assertThat
+import io.mockk.every
+import io.mockk.mockk
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+class StateUseCaseTest {
+
+    private lateinit var stateUseCase: StateUseCase
+    private val stateRepository: StateRepository = mockk(relaxed = true)
+
+    @BeforeEach
+    fun setup(){
+        stateUseCase = StateUseCase(stateRepository)
+    }
+
+    @Test
+    fun `should return true when valid state input`(){
+        // Given
+        val validInput = createStateHelper( name = "TODO")
+        // When
+        val result = stateUseCase.createNewState(validInput)
+        // Then
+        assertThat(result).isTrue()
+    }
+
+    @Test
+    fun `should return true when state creation succeeds`(){
+        // Given
+        every { stateRepository.addState(any()) } returns Result.success(" ")
+        // When
+        val result = stateUseCase.createNewState(createStateHelper())
+        // Then
+        assertThat(result).isTrue()
+    }
+
+    @Test
+    fun `should return false when state creation fails`(){
+        // Given
+        every { stateRepository.addState(any()) } returns Result.failure(Exception())
+        // When
+        val result = stateUseCase.createNewState(createStateHelper())
+        // Then
+        assertThat(result).isFalse()
+    }
+
+}