Added iOS test for different themes in text embedder

mediapipe/tasks/ios/test/text/text_embedder/MPPTextEmbedderTests.m

@@ -139,4 +139,31 @@ static const float kDoubleDiffTolerance = 1e-4;
   XCTAssertEqualWithAccuracy(cosineSimilarity.doubleValue, 0.999937f, kDoubleDiffTolerance);
 }
 
+- (void)testEmbedWithBertAndDifferentThemesSucceeds {
+  MPPTextEmbedder *textEmbedder =
+      [self textEmbedderFromModelFileWithName:kBertTextEmbedderModelName];
+
+  MPPEmbedding *embedding1 =
+      [self assertFloatEmbeddingResultsOfEmbedText:
+                @"When you go to this restaurant, they hold the pancake upside-down before they "
+                @"hand it to you. It's a great gimmick."
+                                 usingTextEmbedder:textEmbedder
+                                          hasCount:512
+                                        firstValue:42.0832];
+
+  MPPEmbedding *embedding2 =
+      [self assertFloatEmbeddingResultsOfEmbedText:
+                @"Let's make a plan to steal the declaration of independence."
+                                 usingTextEmbedder:textEmbedder
+                                          hasCount:512
+                                        firstValue:50.8856];
+
+  NSNumber *cosineSimilarity = [MPPTextEmbedder cosineSimilarityBetweenEmbedding1:embedding1
+                                                                    andEmbedding2:embedding2
+                                                                            error:nil];
+
+  // TODO: The similarity should likely be lower
+  XCTAssertEqualWithAccuracy(cosineSimilarity.doubleValue, 0.963203f, kDoubleDiffTolerance);
+}
+
 @end