Improve MaxCtrl test coverage

Added tests that cover areas that weren't tested before.

maxctrl/test/api.js

@@ -0,0 +1,51 @@
+require('../test_utils.js')()
+
+describe("API", function() {
+    before(startMaxScale)
+
+    it('gets resource', function() {
+        return doCommand('api get servers')
+            .should.be.fulfilled
+    })
+
+    it('gets resource with path', function() {
+        return doCommand('api get servers data[0].id')
+            .then((res) => {
+                js = JSON.parse(res)
+                js.should.equal("server1")
+            })
+    })
+
+    it('sums integer values', function() {
+        return doCommand('api get servers data[].attributes.statistics.connections --sum')
+            .then((res) => {
+                js = JSON.parse(res)
+                js.should.equal(0)
+            })
+    })
+
+    it('does not sum string values', function() {
+        return doCommand('api get servers data[].id --sum')
+            .then((res) => {
+                js = JSON.parse(res)
+                js.should.deep.equal(["server1", "server2", "server3", "server4"])
+            })
+    })
+
+    it('does not sum objects', function() {
+        return doCommand('api get servers --sum')
+            .should.be.fulfilled
+    })
+
+    it('does not sum undefined objects', function() {
+        return doCommand('api get servers asdf --sum')
+            .should.be.fulfilled
+    })
+
+    it('ignores unknown command', function() {
+        return doCommand('api upgrade')
+            .should.be.rejected
+    })
+
+    after(stopMaxScale)
+});