test: use assert.strictEqual()

Fixes: #775
PR-URL: #777
Reviewed-By: Nicola Del Gobbo <nicoladelgobbo@gmail.com>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

test/threadsafe_function/threadsafe_function_existing_tsfn.js

@@ -10,8 +10,8 @@ module.exports = test(require(`../build/${buildType}/binding.node`))
 async function test(binding) {
   const testCall = binding.threadsafe_function_existing_tsfn.testCall;
 
-  assert(typeof await testCall({ blocking: true,  data: true  }) === "number");
-  assert(typeof await testCall({ blocking: true,  data: false }) === "undefined");
-  assert(typeof await testCall({ blocking: false, data: true  }) === "number");
-  assert(typeof await testCall({ blocking: false, data: false }) === "undefined");
+  assert.strictEqual(typeof await testCall({ blocking: true,  data: true  }), "number");
+  assert.strictEqual(typeof await testCall({ blocking: true,  data: false }), "undefined");
+  assert.strictEqual(typeof await testCall({ blocking: false, data: true  }), "number");
+  assert.strictEqual(typeof await testCall({ blocking: false, data: false }), "undefined");
 }