tests for getDevices

test/swm.tests.js

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+'use strict';
+
+const sinon = require('sinon');
+const assert = require('assert');
+const proxyquire = require('proxyquire');
+
+describe('swm', () => {
+    let sandbox;
+
+    beforeEach(() => {
+        sandbox = sinon.sandbox.create();
+    });
+
+    afterEach(function() {
+        sandbox.restore();
+    });
+
+    describe('getDevices', () => {
+        let execStub;
+        let xrandrParseStub;
+        let swm;
+
+        beforeEach(() => {
+            execStub = sandbox.stub();
+            xrandrParseStub = sandbox.stub();
+            swm = proxyquire('../swm.js', {
+                child_process: {
+                    exec: execStub
+                },
+                'xrandr-parse': xrandrParseStub
+            });
+        });
+
+        it('calls exec', () => {
+            swm.getDevices();
+
+            assert.equal(execStub.callCount, 1);
+            assert.equal(execStub.args[0][0], 'xrandr');
+        });
+
+        it('returns promise', () => {
+            const devices = swm.getDevices();
+            assert.equal(typeof devices.then, 'function');
+            assert.equal(typeof devices.catch, 'function');
+        });
+
+        it('rejects when exec passes error', (done) => {
+            const devices = swm.getDevices();
+            const cb = execStub.args[0][1];
+            cb('some error');
+
+            return devices.catch((err) => {
+                assert.equal(xrandrParseStub.callCount, 0);
+                assert.equal(err, 'some error');
+                done();
+            });
+
+        });
+
+        it('parses result', (done) => {
+            xrandrParseStub.returns('some result');
+            const devices = swm.getDevices();
+            const cb = execStub.args[0][1];
+            cb(null, 'stdout');
+
+            return devices.then((result) => {
+                assert.equal(xrandrParseStub.args[0][0], 'stdout');
+                assert.equal(xrandrParseStub.callCount, 1);
+                assert.equal(result, 'some result');
+                done();
+            });
+
+        });
+    });
+});
+