[webnn] Add tests for concat operation.

webnn/concat.https.any.js

@@ -0,0 +1,21 @@
+// META: title=test WebNN API concat operation
+// META: global=window,dedicatedworker
+// META: script=./resources/utils.js
+// META: timeout=long
+
+'use strict';
+
+// https://webmachinelearning.github.io/webnn/#api-mlgraphbuilder-concat
+
+const buildConcat = (builder, resources) => {
+  // MLOperand concat(sequence<MLOperand> inputs, long axis);
+  const namedOutputOperand = {};
+  const inputOperands = [];
+  for (let input of resources.inputs) {
+    inputOperands.push(builder.input(input.name, {type: input.type, dimensions: input.shape}));
+  }
+  namedOutputOperand[resources.expected.name] = builder.concat(inputOperands, resources.axis);
+  return namedOutputOperand;
+};
+
+testWebNNOperation('concat', '/webnn/resources/test_data/concat.json', buildConcat);