diff --git a/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/AddRelationshipTest.kt b/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/AddRelationshipTest.kt
new file mode 100644
index 00000000000..dc78c6c3013
--- /dev/null
+++ b/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/AddRelationshipTest.kt
@@ -0,0 +1,82 @@
+package org.dhis2.tracker.relationships.domain
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.test.runTest
+import org.dhis2.commons.viewmodel.DispatcherProvider
+import org.dhis2.tracker.relationships.data.RelationshipsRepository
+import org.dhis2.tracker.relationships.model.RelationshipDirection
+import org.hisp.dhis.android.core.relationship.Relationship
+import org.junit.Before
+import org.junit.Test
+import org.mockito.kotlin.doReturn
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.whenever
+
+class AddRelationshipTest {
+
+    private lateinit var addRelationship: AddRelationship
+
+    private val dispatcherProvider: DispatcherProvider = mock {
+        on { io() } doReturn Dispatchers.Unconfined
+    }
+    private val repository: RelationshipsRepository = mock()
+
+    @Before
+    fun setup() {
+        addRelationship = AddRelationship(
+            dispatcher = dispatcherProvider,
+            repository = repository
+        )
+    }
+
+    @Test
+    fun shouldAddRelationship() = runTest {
+        // Given user tries to add a relationship
+        val selectedTeiUid = "selectedTeiUid"
+        val relationshipTypeUid = "relationshipTypeUid"
+        val direction = RelationshipDirection.TO
+
+        val relationship = Relationship.builder()
+            .uid("relationshipUid")
+            .build()
+
+        // When
+        whenever(
+            repository.createRelationship(selectedTeiUid, relationshipTypeUid, direction)
+        ) doReturn relationship
+        whenever(
+            repository.addRelationship(relationship)
+        ) doReturn Result.success("relationshipUid")
+
+        val result = addRelationship(selectedTeiUid, relationshipTypeUid, direction)
+
+        // Then
+        assert(result.isSuccess)
+    }
+
+    @Test
+    fun shouldFailWhenAddRelationship() = runTest {
+        // Given user tries to add a relationship
+        val selectedTeiUid = "selectedTeiUid"
+        val relationshipTypeUid = "relationshipTypeUid"
+        val direction = RelationshipDirection.TO
+
+        val relationship = Relationship.builder()
+            .uid("relationshipUid")
+            .build()
+
+        // When
+        whenever(
+            repository.createRelationship(selectedTeiUid, relationshipTypeUid, direction)
+        ) doReturn relationship
+        whenever(
+            repository.addRelationship(relationship)
+        ) doReturn Result.failure(Exception("Failed to add relationship"))
+
+        val result = addRelationship(selectedTeiUid, relationshipTypeUid, direction)
+
+        // Then there is an error when adding relationship
+        assert(result.isFailure)
+        assert(result.exceptionOrNull()?.message == "Failed to add relationship")
+    }
+}
\ No newline at end of file
diff --git a/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/GetRelationshipsByTypeTest.kt b/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/GetRelationshipsByTypeTest.kt
index 57e14b07725..7510fe1584e 100644
--- a/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/GetRelationshipsByTypeTest.kt
+++ b/tracker/src/test/kotlin/org/dhis2/tracker/relationships/domain/GetRelationshipsByTypeTest.kt
@@ -28,7 +28,7 @@ import java.util.Date
 
 class GetRelationshipsByTypeTest {
 
-    lateinit var getRelationshipsByType: GetRelationshipsByType
+    private lateinit var getRelationshipsByType: GetRelationshipsByType
 
     private val relationshipsRepository: RelationshipsRepository = mock()
     private val dateLabelProvider: DateLabelProvider = mock()