feat(test): bind text assertions to targets

hemx-test/src/lib.rs

@@ -462,17 +462,41 @@ impl EffectInspector {
         self.has_resource(target.__hemx_resource_id())
     }
 
-    /// Assert that a generated target receives a text update, without matching raw effects.
+    /// Check that a generated target receives a text update, without matching raw effects.
     /// req: test/001 req: dx/006
     pub fn updates_text(&self, target: impl GeneratedTarget) -> bool {
+        self.has_text_update_containing(target.__hemx_resource_id(), "")
+    }
+
+    /// Check that a generated target receives a text update containing a fragment.
+    ///
+    /// This associates the payload condition with the intended target, unlike a separate global
+    /// [`Self::payload_contains`] check that can accidentally match another operation.
+    /// req: test/001 req: test/018 req: dx/006
+    pub fn updates_text_containing(&self, target: impl GeneratedTarget, needle: &str) -> bool {
+        self.has_text_update_containing(target.__hemx_resource_id(), needle)
+    }
+
+    /// Assert that a generated target receives a text update containing a fragment.
+    /// req: test/001 req: test/018 req: dx/006
+    #[track_caller]
+    pub fn assert_updates_text_containing(&self, target: impl GeneratedTarget, needle: &str) {
         let resource = target.__hemx_resource_id();
+        assert!(
+            self.has_text_update_containing(resource, needle),
+            "expected a text update for {resource:?} containing {needle:?}; actual effects: {:#?}",
+            self.batch.ops
+        );
+    }
+
+    fn has_text_update_containing(&self, resource: ResourceId, needle: &str) -> bool {
         self.batch.ops.iter().any(|op| {
             matches!(
                 op,
                 Effect::Put {
                     target,
-                    payload: Payload::Text(_),
-                } if target.resource == resource
+                    payload: Payload::Text(text),
+                } if target.resource == resource && text.contains(needle)
             )
         })
     }