add tests and error message tweaks

Signed-off-by: HenryL27 <hmlindeman@yahoo.com>

common/src/main/java/org/opensearch/ml/common/dataset/TextSimilarityInputDataSet.java

@@ -46,7 +46,7 @@ public TextSimilarityInputDataSet(String queryText, List<String> textDocs) {
         Objects.requireNonNull(textDocs);
         Objects.requireNonNull(queryText);
         if(textDocs.isEmpty()) {
-            throw new IllegalArgumentException("pairs must be nonempty");
+            throw new IllegalArgumentException("No text documents provided");
         }
         this.textDocs = textDocs;
         this.queryText = queryText;

common/src/main/java/org/opensearch/ml/common/input/nlp/TextSimilarityMLInput.java

@@ -105,10 +105,10 @@ public TextSimilarityMLInput(XContentParser parser, FunctionName functionName) t
             }
         }        
         if(docs.isEmpty()) {
-            throw new IllegalArgumentException("no text docs");
+            throw new IllegalArgumentException("No text documents were provided");
         }
         if(queryText == null) {
-            throw new IllegalArgumentException("no query text");
+            throw new IllegalArgumentException("No query text was provided");
         }
         inputDataset = new TextSimilarityInputDataSet(queryText, docs);
     }

common/src/test/java/org/opensearch/ml/common/dataset/TextSimilarityInputDatasetTest.java

@@ -52,6 +52,14 @@ public void noPairs_ThenFail() {
         String queryText = "today is sunny";
         IllegalArgumentException e = assertThrows(IllegalArgumentException.class, 
             () -> TextSimilarityInputDataSet.builder().textDocs(docs).queryText(queryText).build());
-        assert (e.getMessage().equals("pairs must be nonempty"));
+        assert (e.getMessage().equals("No text documents provided"));
+    }
+
+    @Test
+    public void noQuery_ThenFail() {
+        List<String> docs = List.of("That is a happy dog", "it's summer");
+        String queryText = null;
+        assertThrows(NullPointerException.class,
+            () -> TextSimilarityInputDataSet.builder().textDocs(docs).queryText(queryText).build());
     }
 }

common/src/test/java/org/opensearch/ml/common/input/nlp/TextSimilarityMLInputTest.java

@@ -116,7 +116,7 @@ public void testParseJson_NoPairs_ThenFail() throws IOException {
 
         IllegalArgumentException e = assertThrows(IllegalArgumentException.class,
             () -> MLInput.parse(parser, input.getFunctionName().name()));
-        assert (e.getMessage().equals("no text docs"));
+        assert (e.getMessage().equals("No text documents were provided"));
     }
 
     @Test

ml-algorithms/src/test/java/org/opensearch/ml/engine/algorithms/text_similarity/TextSimilarityCrossEncoderModelTest.java

@@ -189,6 +189,34 @@ public void initModel_predict_TorchScript_CrossEncoder() throws URISyntaxExcepti
         textSimilarityCrossEncoderModel.close();
     }
 
+    @Test
+    public void initModel_predict_ONNX_CrossEncoder() throws URISyntaxException {
+        model = MLModel
+            .builder()
+            .modelFormat(MLModelFormat.ONNX)
+            .name("test_model_name")
+            .modelId("test_model_id")
+            .algorithm(FunctionName.TEXT_SIMILARITY)
+            .version("1.0.0")
+            .modelState(MLModelState.TRAINED)
+            .build();
+        modelZipFile = new File(getClass().getResource("TinyBERT-CE-onnx.zip").toURI());
+        params.put(MODEL_ZIP_FILE, modelZipFile);
+
+        textSimilarityCrossEncoderModel.initModel(model, params, encryptor);
+        MLInput mlInput = MLInput.builder().algorithm(FunctionName.TEXT_SIMILARITY).inputDataset(inputDataSet).build();
+        ModelTensorOutput output = (ModelTensorOutput) textSimilarityCrossEncoderModel.predict(mlInput);
+        List<ModelTensors> mlModelOutputs = output.getMlModelOutputs();
+        assertEquals(2, mlModelOutputs.size());
+        for (int i = 0; i < mlModelOutputs.size(); i++) {
+            ModelTensors tensors = mlModelOutputs.get(i);
+            List<ModelTensor> mlModelTensors = tensors.getMlModelTensors();
+            assertEquals(1, mlModelTensors.size());
+            assertEquals(1, mlModelTensors.get(0).getData().length);
+        }
+        textSimilarityCrossEncoderModel.close();
+    }
+
     @Test
     public void initModel_NullModelHelper() throws URISyntaxException {
         Map<String, Object> params = new HashMap<>();