js: Error handling for browser errors

--

* Connection.js
  - Add some meaningful nativeMessaging feedback for failing
    communication due to misconfiguration or other browser-originated
    fails
  - add an "isDisconnected" property
  - "isNativeHostUnknown" tries to match browser's feedback string if
    the browser does not find gpgme-json
* init.js
  - initialization will now reject with a more meaningful error if the
    configuration is not set up or other browser-based errors
    (chrome.runtime.lastError) are present. This should speed up
    the normal initialization (not having to waiting for a timeout
    any more in case of improper setup)
* errors.js
  - CONN_NATIVEMESSAGE: New error that passes the browser's
    nativeMessaging error
  - CONN_NO_CONFIG: native messaging error indicating that the
    nativeMessaging host was not set up properly
* unittests.js:
  - added the "isDisconnected" property to the startup tests
  - added tests for proper behavior of connection checks

1 files changed, 32 insertions, 0 deletions

diff --git a/lang/js/unittests.js b/lang/js/unittests.js
index 414d18d1..45e2b93c 100644
--- a/lang/js/unittests.js
+++ b/lang/js/unittests.js
@@ -49,11 +49,42 @@ function unittests (){
                     expect(answer.info).to.be.an('Array');
                     expect(conn0.disconnect).to.be.a('function');
                     expect(conn0.post).to.be.a('function');
+                    expect(conn0.isDisconnected).to.be.false;
                     done();
                 });
 
         });
 
+        it('Simple connection check', function (done) {
+            let conn0 = new Connection;
+            conn0.checkConnection(false, connectionTimeout).then(
+                function (answer) {
+                    expect(answer).to.be.true;
+                    expect(conn0.isDisconnected).to.be.false;
+                    done();
+                });
+        });
+
+        it('Connection check with backend information', function (done) {
+            let conn0 = new Connection;
+            conn0.checkConnection(true, connectionTimeout).then(
+                function (answer) {
+                    expect(answer).to.be.an('Object');
+                    expect(answer.gpgme).to.be.a('String');
+                    expect(answer.info).to.be.an('Array');
+                    expect(answer.info.length).to.be.above(0);
+                    for (const item of answer.info) {
+                        expect(item).to.have.property('protocol');
+                        expect(item).to.have.property('fname');
+                        expect(item).to.have.property('version');
+                        expect(item).to.have.property('req_version');
+                        expect(item).to.have.property('homedir');
+                    }
+                    expect(conn0.isDisconnected).to.be.false;
+                    done();
+                });
+        });
+
         it('Disconnecting', function (done) {
             let conn0 = new Connection;
             conn0.checkConnection(false, connectionTimeout).then(
@@ -63,6 +94,7 @@ function unittests (){
                     conn0.checkConnection(false, connectionTimeout).then(
                         function (result) {
                             expect(result).to.be.false;
+                            expect(conn0.isDisconnected).to.be.true;
                             done();
                         });
                 });