[ios, macos] Rewrote style layer tests

Replaced the style layer integration tests with unit tests. Test conversion of style values to property values and vice versa, not just round-tripping. Test the initial state and null-resetting of each null-resettable property. Test NSValue additions for style attribute enumerations. Test properties common to all style layer classes. Test MGLStyle’s source and layer collections.

Eviscerated implementations of unavailable style layer properties corresponding to style specification properties that were renamed. Implemented corresponding getters to prevent ivars from being autosynthesized for these unavailable properties.

Added a missing bridging header to the iOS test project.

1 files changed, 12 insertions, 6 deletions

diff --git a/platform/darwin/src/MGLLineStyleLayer.mm b/platform/darwin/src/MGLLineStyleLayer.mm
index f3b9f22df9..f6884fad15 100644
--- a/platform/darwin/src/MGLLineStyleLayer.mm
+++ b/platform/darwin/src/MGLLineStyleLayer.mm
@@ -238,9 +238,11 @@ namespace mbgl {
     return MGLStyleValueTransformer<std::vector<float>, NSArray<NSNumber *> *, float>().toStyleValue(propertyValue);
 }
 
-
 - (void)setLineDasharray:(MGLStyleValue<NSArray<NSNumber *> *> *)lineDasharray {
-    NSAssert(NO, @"Use -setLineDashPattern: instead.");
+}
+
+- (MGLStyleValue<NSArray<NSNumber *> *> *)lineDasharray {
+    return self.lineDashPattern;
 }
 
 - (void)setLineGapWidth:(MGLStyleValue<NSNumber *> *)lineGapWidth {
@@ -313,9 +315,11 @@ namespace mbgl {
     return MGLStyleValueTransformer<std::array<float, 2>, NSValue *>().toStyleValue(propertyValue);
 }
 
-
 - (void)setLineTranslate:(MGLStyleValue<NSValue *> *)lineTranslate {
-    NSAssert(NO, @"Use -setLineTranslation: instead.");
+}
+
+- (MGLStyleValue<NSValue *> *)lineTranslate {
+    return self.lineTranslation;
 }
 
 - (void)setLineTranslationAnchor:(MGLStyleValue<NSValue *> *)lineTranslationAnchor {
@@ -332,9 +336,11 @@ namespace mbgl {
     return MGLStyleValueTransformer<mbgl::style::TranslateAnchorType, NSValue *, mbgl::style::TranslateAnchorType, MGLLineTranslationAnchor>().toEnumStyleValue(propertyValue);
 }
 
-
 - (void)setLineTranslateAnchor:(MGLStyleValue<NSValue *> *)lineTranslateAnchor {
-    NSAssert(NO, @"Use -setLineTranslationAnchor: instead.");
+}
+
+- (MGLStyleValue<NSValue *> *)lineTranslateAnchor {
+    return self.lineTranslationAnchor;
 }
 
 - (void)setLineWidth:(MGLStyleValue<NSNumber *> *)lineWidth {