Improve code coverage

Signed-off-by: Artur Ciocanu <ciocanu@adobe.com>

sdk-workflows/src/test/java/io/dapr/workflows/runtime/DefaultWorkflowActivityContextTest.java

@@ -1,7 +1,6 @@
 package io.dapr.workflows.runtime;
 
 import io.dapr.durabletask.TaskActivityContext;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -11,36 +10,39 @@ import static org.mockito.Mockito.when;
 
 class DefaultWorkflowActivityContextTest {
 
-  private DefaultWorkflowActivityContext context;
-
-  @BeforeEach
-  void setUp() {
+  @Test
+  void testDefaultWorkflowActivityContext() {
     TaskActivityContext mockInnerContext = mock(TaskActivityContext.class);
-    context = new DefaultWorkflowActivityContext(mockInnerContext);
+    DefaultWorkflowActivityContext context = new DefaultWorkflowActivityContext(mockInnerContext);
 
     when(mockInnerContext.getName()).thenReturn("TestActivity");
     when(mockInnerContext.getInput(any())).thenReturn("TestInput");
     when(mockInnerContext.getTaskExecutionId()).thenReturn("TestExecutionId");
-  }
 
-  @Test
-  void getLogger() {
     assertNotNull(context.getLogger());
-  }
-
-  @Test
-  void getName() {
     assertEquals("TestActivity", context.getName());
-  }
 
-  @Test
-  void getInput() {
     String input = context.getInput(String.class);
-    assertEquals("TestInput", input);
-  }
 
-  @Test
-  void getTaskExecutionId() {
+    assertEquals("TestInput", input);
     assertEquals("TestExecutionId", context.getTaskExecutionId());
   }
+
+  @Test
+  void testDefaultWorkflowActivityContextWithNullContext() {
+    IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {
+      new DefaultWorkflowActivityContext(null);
+    });
+    assertEquals("Context cannot be null", exception.getMessage());
+  }
+
+  @Test
+  void testDefaultWorkflowActivityContextWithNullLogger() {
+    TaskActivityContext mockInnerContext = mock(TaskActivityContext.class);
+
+    IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> {
+      new DefaultWorkflowActivityContext(mockInnerContext, null);
+    });
+    assertEquals("Logger cannot be null", exception.getMessage());
+  }
 }