crud tests for subjects, assignments and tasks

app/subject/createSubject.tsx

@@ -103,6 +103,7 @@ export default function CreateSubject() {
               <View className="mb-5">
                 <Text className={labelClassName}>Title</Text>
                 <TextInput
+                  testID="subject-title-input"
                   className={inputClassName}
                   placeholder="Enter subject title"
                   value={title}
@@ -157,6 +158,7 @@ export default function CreateSubject() {
               </Pressable>
 
               <Pressable
+                testID="create-subject-button"
                 className={`h-14 items-center justify-center rounded-2xl ${
                   isSaving ? 'bg-accent-disabled' : 'bg-accent'
                 }`}

app/subject/editSubject.tsx

@@ -88,6 +88,7 @@ export default function EditSubject() {
             <TouchableWithoutFeedback onPress={Keyboard.dismiss}>
               <View style={defaultStyles.container}>
                 <TextInput
+                  testID="subject-title-input"
                   style={defaultStyles.inputText}
                   placeholder="Title"
                   value={subject.title}
@@ -109,7 +110,7 @@ export default function EditSubject() {
                   <Text style={defaultStyles.checkboxLabel}>{subject.isActive ? 'Active' : 'inactive'}</Text>
                 </Pressable>
 
-                <Button title={isSaving ? "Saving..." : "Save"} onPress={EditSubject} disabled={isSaving} />
+                <Button testID="edit-subject-button" title={isSaving ? "Saving..." : "Save"} onPress={EditSubject} disabled={isSaving} />
                 {isSaving && (
                   <ActivityIndicator size="large" />
                 )}

app/subject/viewDetailsSubject.tsx

@@ -186,7 +186,7 @@ export default function ViewDetailsSubject() {
             </View>
 
             <Button title="Edit" onPress={() => router.push({pathname: "/subject/editSubject", params: { sId: subject.sId }})} />
-            <Button title="Delete" onPress={() => DeleteSubject(subject.sId)} />
+            <Button testID = "delete-subject-button" title="Delete" onPress={() => DeleteSubject(subject.sId)} />
 
             <View style={defaultStyles.buttonContainer}>
               <Button title="Create Assignment" onPress={() => router.push({pathname: "/assignment/createAssignment", params: { sId: subject.sId }})} />