add standalone mss rendering tests for desired empty style dropping behavior - refs #219

test/rendering-mss.test.js

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+var path = require('path'),
+    assert = require('assert'),
+    fs = require('fs');
+
+var existsSync = require('fs').existsSync || require('path').existsSync;
+var carto = require('../lib/carto');
+var tree = require('../lib/carto/tree');
+var helper = require('./support/helper');
+
+describe('Rendering mss', function() {
+helper.files('rendering-mss', 'mss', function(file) {
+    it('should render mss ' + path.basename(file) + ' correctly', function(done) {
+        var completed = false;
+        var renderResult;
+        var mss = helper.mss(file);
+        new carto.Renderer({
+            paths: [ path.dirname(file) ],
+            data_dir: path.join(__dirname, '../data'),
+            local_data_dir: path.join(__dirname, 'rendering'),
+            filename: file
+        }).renderMSS(mss, function (err, output) {
+            if (err) {
+                if (Array.isArray(err)){
+                    err.forEach(carto.writeError);
+                    done();
+                } else {
+                    throw err;
+                    done();
+                }
+            } else {
+                var expected =  file.replace(path.extname(file),'')+'.xml';
+                if (!existsSync(expected)) {
+                  fs.writeFileSync(expected,output);
+                }
+                var expected_data = fs.readFileSync(expected).toString();
+                assert.equal(output,expected_data);
+                done();
+                /*
+                helper.compareToXMLFile(result, output, function(err) {
+                    completed = true;
+                    if (err) {
+                        console.warn(
+                            helper.stylize("Failure", 'red') + ': ' +
+                            helper.stylize(file, 'underline') +
+                            ' differs from expected result.');
+                        helper.showDifferences(err);
+                        throw '';
+                        done();
+                    } else { done(); }
+                });
+                */
+            }
+        });
+
+        // beforeExit(function() {
+        //     if (!completed && renderResult) {
+        //         console.warn(helper.stylize('renderer produced:', 'bold'));
+        //         console.warn(renderResult);
+        //     }
+        //     assert.ok(completed, 'Rendering finished.');
+        // });
+    });
+});
+});

test/rendering-mss/should-discard-empty-style-and-attach.mss

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+#landcover {
+  ::foo {
+  }
+}

test/rendering-mss/should-discard-empty-style.mss

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+#landcover {
+}

test/rendering-mss/style-level-prop-only.mss

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+#landcover {
+  opacity:.5;
+}

test/rendering-mss/style-level-prop-only.xml

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+<Style name="style" filter-mode="first"  opacity="0.5" >
+</Style>

test/rendering-mss/style-level-prop-only2.mss

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+#landcover {
+  comp-op:color-burn;
+}

test/rendering-mss/style-level-prop-only2.xml

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+<Style name="style" filter-mode="first"  comp-op="color-burn" >
+</Style>

test/rendering-mss/style-level-prop-only3.mss

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+#landcover {
+  image-filters:invert();
+}

test/rendering-mss/style-level-prop-only3.xml

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+<Style name="style" filter-mode="first"  image-filters="invert" >
+</Style>