Add tests

.gitignore

@@ -4,3 +4,5 @@ node_modules/
 .cache/
 
 .rts2_cache_*
+
+.vscode

.travis.yml

@@ -0,0 +1,8 @@
+sudo: required
+
+services:
+  - docker
+
+script:
+  - docker build -t comlink .
+  - docker run --rm -v `pwd`:/usr/src comlink

Dockerfile

@@ -0,0 +1,19 @@
+FROM selenium/node-chrome:latest@sha256:31be7ba7ebe6db9f9b266c10fc5f6fce7568791a6ade91b6b6d20a29a988ef5b
+
+USER root
+
+RUN apt-get update -qqy \
+  && rm -rf /var/lib/apt/lists/* /var/cache/apt/* \
+  && rm /bin/sh && ln -s /bin/bash /bin/sh \
+  && chown seluser /usr/local
+
+ENV NVM_DIR /usr/local/nvm
+RUN wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash \
+  && source $NVM_DIR/nvm.sh \
+  && nvm install v11
+
+ENV CHROME_BIN /opt/google/chrome/chrome
+ENV INSIDE_DOCKER=1
+
+WORKDIR /usr/src
+ENTRYPOINT source $NVM_DIR/nvm.sh && npm i && npm run test

karma.conf.js

@@ -0,0 +1,72 @@
+module.exports = function (config) {
+  config.set({
+    frameworks: ["mocha", "chai", "detectBrowsers"],
+    files: [{ pattern: "test/*.test.js" }],
+    preprocessors: {
+      "test/*.test.js": ["webpack"], //preprocess with webpack
+    },
+    reporters: ["dots"], //report results in this format
+    webpack: {
+      devtool: "inline-source-map", //just do inline source maps instead of the default
+      module: {
+        rules: [
+          {
+            test: /test\.js$/,
+            use: {
+              loader: "babel-loader",
+              options: {
+                presets: [
+                  [
+                    "@babel/preset-env",
+                    {
+                      targets: {
+                        esmodules: true,
+                      },
+                    },
+                  ],
+                ],
+                plugins: [
+                  "@babel/plugin-transform-react-jsx",
+                  "@babel/plugin-proposal-optional-chaining",
+                ],
+              },
+            },
+          },
+        ],
+      },
+    },
+    reporters: ["progress"],
+    singleRun: true,
+    port: 9876, // Karma web server port
+    colors: true,
+    logLevel: config.LOG_INFO,
+    detectBrowsers: {
+      enabled: true,
+      usePhantomJS: false,
+      preferHeadless: true,
+      postDetection: (availableBrowsers) => {
+        if (process.env.INSIDE_DOCKER) {
+          return ["DockerChrome"];
+        } else if (process.env.CHROME_ONLY) {
+          return ["ChromeHeadless"];
+        } else {
+          // Filtering SafariTechPreview because I am having
+          // local issues and I have no idea how to fix them.
+          // I know that’s not a good reason to disable tests,
+          // but Safari TP is relatively unimportant.
+          return availableBrowsers.filter(
+            (browser) => browser !== "SafariTechPreview"
+          );
+        }
+      },
+    },
+    customLaunchers: {
+      DockerChrome: {
+        base: "ChromeHeadless",
+        flags: ["--no-sandbox"],
+      },
+    },
+    autoWatch: false,
+    concurrency: Infinity,
+  });
+};