Add unit tests

test/unit/@node-red/runtime/lib/telemetry/index_spec.js

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+const should = require("should");
+const NR_TEST_UTILS = require("nr-test-utils");
+
+const telemetryApi = NR_TEST_UTILS.require("@node-red/runtime/lib/telemetry/index");
+
+describe("telemetry", function() {
+
+    afterEach(function () {
+        telemetryApi.stop()
+        messages = []
+    })
+
+    let messages = []
+
+    function getMockRuntime(settings) {
+        return {
+            settings: {
+                get: key => { return settings[key] },
+                set: (key, value) => { settings[key] = value },
+                available: () => true,
+            },
+            log: {
+                debug: (msg) => { messages.push(msg)}
+            }
+        }
+    }
+
+    // Principles to test:
+    // - No settings at all; disable telemetry
+    // - Runtime settings only; do what it says
+    // - User settings take precedence over runtime settings
+
+    it('Disables telemetry with no settings present', function () {
+        telemetryApi.init(getMockRuntime({}))
+        messages.should.have.length(0)
+        // Returns undefined as we don't know either way
+        ;(telemetryApi.isEnabled() === undefined).should.be.true()
+    })
+    it('Runtime settings - enable', function () {
+        // Enabled in runtime settings
+        telemetryApi.init(getMockRuntime({
+            telemetry: { enabled: true }
+        }))
+        telemetryApi.isEnabled().should.be.true()
+        messages.should.have.length(1)
+        ;/Telemetry enabled/.test(messages[0]).should.be.true()
+    })
+    it('Runtime settings - disable', function () {
+        telemetryApi.init(getMockRuntime({
+            telemetry: { enabled: false },
+        }))
+        // Returns false, not undefined
+        telemetryApi.isEnabled().should.be.false()
+        messages.should.have.length(0)
+    })
+
+    it('User settings - enable overrides runtime settings', function () {
+        telemetryApi.init(getMockRuntime({
+            telemetry: { enabled: false },
+            telemetryEnabled: true
+        }))
+        telemetryApi.isEnabled().should.be.true()
+        messages.should.have.length(1)
+        ;/Telemetry enabled/.test(messages[0]).should.be.true()
+    })
+
+    it('User settings - disable overrides runtime settings', function () {
+        telemetryApi.init(getMockRuntime({
+            telemetry: { enabled: true },
+            telemetryEnabled: false
+        }))
+        telemetryApi.isEnabled().should.be.false()
+        messages.should.have.length(0)
+    })
+    
+    it('Can enable/disable telemetry', function () {
+        const settings = {}
+        telemetryApi.init(getMockRuntime(settings))
+        ;(telemetryApi.isEnabled() === undefined).should.be.true()
+
+        telemetryApi.enable()
+
+        telemetryApi.isEnabled().should.be.true()
+        messages.should.have.length(1)
+        ;/Telemetry enabled/.test(messages[0]).should.be.true()
+        settings.should.have.property('telemetryEnabled', true)
+
+        telemetryApi.disable()
+
+        telemetryApi.isEnabled().should.be.false()
+        messages.should.have.length(2)
+        ;/Telemetry disabled/.test(messages[1]).should.be.true()
+        settings.should.have.property('telemetryEnabled', false)
+
+    })
+})

test/unit/@node-red/runtime/lib/telemetry/metrics/01-core_spec.js

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+const should = require("should");
+const NR_TEST_UTILS = require("nr-test-utils");
+
+const api = NR_TEST_UTILS.require("@node-red/runtime/lib/telemetry/metrics/01-core");
+
+describe("telemetry metrics/01-core", function() {
+
+    it('reports core metrics', function () {
+        const result = api({
+            settings: {
+                get: key => { return {instanceId: "1234"}[key]}
+            }
+        })
+        result.should.have.property("instanceId", "1234")
+    })
+})

test/unit/@node-red/runtime/lib/telemetry/metrics/02-os_spec.js

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+const should = require("should");
+const NR_TEST_UTILS = require("nr-test-utils");
+
+const api = NR_TEST_UTILS.require("@node-red/runtime/lib/telemetry/metrics/02-os");
+
+describe("telemetry metrics/02-os", function() {
+
+    it('reports os metrics', function () {
+        const result = api()
+        result.should.have.property("os.type")
+        result.should.have.property("os.release")
+        result.should.have.property("os.arch")
+    })
+})

test/unit/@node-red/runtime/lib/telemetry/metrics/03-env_spec.js

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+const should = require("should");
+const NR_TEST_UTILS = require("nr-test-utils");
+
+const api = NR_TEST_UTILS.require("@node-red/runtime/lib/telemetry/metrics/03-env");
+
+describe("telemetry metrics/03-env", function() {
+
+    it('reports env metrics', function () {
+        const result = api({
+            settings: {
+                version: '1.2.3'
+            }
+        })
+        result.should.have.property("env.nodejs", process.version.replace(/^v/, ''))
+        result.should.have.property("env.node-red", '1.2.3')
+    })
+})