add tests for libs

test_app/app/contracts/test2.sol

@@ -0,0 +1,16 @@
+pragma solidity ^0.4.17;
+
+import "./zlib2.sol";
+
+contract Test2 {
+  address public addr;
+
+  function testAdd() public pure returns (uint _result) {
+    return ZAMyLib2.add(1, 2);
+  }
+
+  function changeAddress(address _addr) public {
+    addr = _addr;
+  }
+
+}

test_app/app/contracts/zlib2.sol

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+pragma solidity ^0.4.17;
+
+library ZAMyLib2 {
+
+  function add(uint _a, uint _b) public pure returns (uint _c) {
+    return _a + _b;
+  }
+
+}

test_app/test/lib_test_spec.js

@@ -0,0 +1,22 @@
+describe("Test", function() {
+  before(function(done) {
+    this.timeout(0);
+    var contractsConfig = {
+      "Test": {
+        "gas": 2000000
+      },
+      "ZAMyLib2": {
+        "deploy": true
+      }
+    };
+    EmbarkSpec.deployAll(contractsConfig, () => { done() });
+  });
+
+  it("should call library correctly", function(done) {
+    Test2.testAdd(function(err, result) {
+      assert.equal(result.toNumber(), 3);
+      done();
+    });
+  });
+
+});