diff --git a/src/backend/tests/api.rs b/src/backend/tests/api.rs
index e638b04..4cd86c0 100644
--- a/src/backend/tests/api.rs
+++ b/src/backend/tests/api.rs
@@ -2,8 +2,8 @@ use super::utils::{
     test_audiounit_get_buffer_frame_size, test_audiounit_scope_is_enabled, test_create_audiounit,
     test_device_channels_in_scope, test_device_in_scope, test_get_all_devices,
     test_get_default_audiounit, test_get_default_device, test_get_default_raw_stream,
-    test_get_devices_in_scope, test_get_raw_context, test_get_source_name, ComponentSubType,
-    DeviceFilter, PropertyScope, Scope,
+    test_get_devices_in_scope, test_get_raw_context, ComponentSubType, DeviceFilter, PropertyScope,
+    Scope,
 };
 use super::*;
 
diff --git a/src/backend/tests/utils.rs b/src/backend/tests/utils.rs
index 6ea1ebf..ef07aee 100644
--- a/src/backend/tests/utils.rs
+++ b/src/backend/tests/utils.rs
@@ -211,51 +211,6 @@ fn test_enable_audiounit_in_scope(
     }
 }
 
-pub fn test_get_source_name(device: AudioObjectID, scope: Scope) -> Option<String> {
-    test_get_source_data(device, scope).map(u32_to_string)
-}
-
-pub fn test_get_source_data(device: AudioObjectID, scope: Scope) -> Option<u32> {
-    let address = AudioObjectPropertyAddress {
-        mSelector: kAudioDevicePropertyDataSource,
-        mScope: match scope {
-            Scope::Input => kAudioDevicePropertyScopeInput,
-            Scope::Output => kAudioDevicePropertyScopeOutput,
-        },
-        mElement: kAudioObjectPropertyElementMaster,
-    };
-    let mut size = mem::size_of::<u32>();
-    let mut data: u32 = 0;
-
-    let status = unsafe {
-        AudioObjectGetPropertyData(
-            device,
-            &address,
-            0,
-            ptr::null(),
-            &mut size as *mut usize as *mut u32,
-            &mut data as *mut u32 as *mut c_void,
-        )
-    };
-
-    // TODO: Can data be 0 when no error returns ?
-    if status == NO_ERR && data > 0 {
-        Some(data)
-    } else {
-        None
-    }
-}
-
-fn u32_to_string(data: u32) -> String {
-    // Reverse 0xWXYZ into 0xZYXW.
-    let mut buffer = [b'\x00'; 4]; // 4 bytes for u32.
-    buffer[0] = (data >> 24) as u8;
-    buffer[1] = (data >> 16) as u8;
-    buffer[2] = (data >> 8) as u8;
-    buffer[3] = (data) as u8;
-    String::from_utf8_lossy(&buffer).to_string()
-}
-
 pub enum DeviceFilter {
     ExcludeCubebAggregateAndVPIO,
     IncludeAll,