Add unit test for FormatSectionOverride expression

test/unit/symbol/format_section_override.test.js

@@ -0,0 +1,66 @@
+import { test } from 'mapbox-gl-js-test';
+import { createExpression, ZoomConstantExpression } from '../../../src/style-spec/expression';
+import EvaluationContext from '../../../src/style-spec/expression/evaluation_context';
+import properties from '../../../src/style/style_layer/symbol_style_layer_properties';
+import {PossiblyEvaluatedPropertyValue} from '../../../src/style/properties';
+import FormatSectionOverride from '../../../src/style-spec/expression/definitions/format_section_override';
+
+test('evaluate', (t) => {
+
+    t.test('override constant', (t) => {
+        const defaultColor = { "r": 0, "g": 1, "b": 0, "a": 1 };
+        const overridenColor = { "r": 1, "g": 0, "b": 0, "a": 1 };
+        const overriden = new PossiblyEvaluatedPropertyValue(
+            properties.paint.properties['text-color'],
+            { kind: 'constant', value: defaultColor },
+            {zoom: 0, zoomHistory: {}}
+        );
+
+        const override = new FormatSectionOverride(overriden);
+        const ctx = new EvaluationContext();
+        ctx.feature = {};
+        ctx.featureState = {};
+        t.deepEqual(override.evaluate(ctx), defaultColor);
+
+        ctx.formattedSection = {textColor: overridenColor};
+        t.deepEqual(override.evaluate(ctx), overridenColor);
+
+        t.end();
+    });
+
+    t.test('override expression', (t) => {
+        const warn = console.warn;
+        console.warn = (_) => {};
+        const defaultColor = { "r": 0, "g": 0, "b": 0, "a": 1 };
+        const propertyColor = { "r": 1, "g": 0, "b": 0, "a": 1 };
+        const overridenColor = { "r": 0, "g": 0, "b": 1, "a": 1 };
+        const styleExpr = createExpression(
+            ["get", "color"],
+            properties.paint.properties['text-color'].specification);
+
+        const sourceExpr = new ZoomConstantExpression('source', styleExpr.value);
+        const overriden = new PossiblyEvaluatedPropertyValue(
+            properties.paint.properties['text-color'],
+            sourceExpr,
+            {zoom: 0, zoomHistory: {}}
+        );
+
+        const override = new FormatSectionOverride(overriden);
+        const ctx = new EvaluationContext();
+        ctx.feature = { properties: {}};
+        ctx.featureState = {};
+
+        t.deepEqual(override.evaluate(ctx), defaultColor);
+
+        ctx.feature.properties.color = "red";
+        t.deepEqual(override.evaluate(ctx), propertyColor);
+
+        ctx.formattedSection = {textColor: overridenColor};
+        t.deepEqual(override.evaluate(ctx), overridenColor);
+
+        console.warn = warn;
+        t.end();
+    });
+
+    t.end();
+});