1 files changed, 67 insertions, 0 deletions
diff --git a/platform/darwin/test/MGLStyleLayerTests.m b/platform/darwin/test/MGLStyleLayerTests.m
index 74c6b2f906..590d6eda7f 100644
--- a/platform/darwin/test/MGLStyleLayerTests.m
+++ b/platform/darwin/test/MGLStyleLayerTests.m
@@ -1,7 +1,13 @@
 #import "MGLStyleLayerTests.h"
 
+#import "NSString+MGLAdditions.h"
+
+#define TEST_STRICT_NAMING_CONVENTIONS 0
+
 @implementation MGLStyleLayerTests
 
+@dynamic layerType;
+
 - (void)setUp {
     [super setUp];
 #if TARGET_OS_IPHONE
@@ -19,4 +25,65 @@
 #endif
 }
 
+- (void)testPropertyName:(NSString *)name isBoolean:(BOOL)isBoolean {
+    NS_MUTABLE_ARRAY_OF(NSString *) *components = [name componentsSeparatedByString:@"-"].mutableCopy;
+    if (isBoolean) {
+        if ([components.firstObject isEqualToString:@"is"]) {
+            [components removeObjectAtIndex:0];
+            if (![components.lastObject.lexicalClasses containsObject:NSLinguisticTagAdjective]) {
+                XCTAssertTrue([components.lastObject.lexicalClasses containsObject:NSLinguisticTagVerb],
+                              @"Boolean getter %@ that starts with “is” should contain an adjective, past participle, or verb.", name);
+                XCTAssertNotEqualObjects(components.lastObject.lemma, components.lastObject,
+                                         @"Boolean getter %@ should not have infinitive, imperative, or present tense verb.", name);
+            }
+        } else {
+            if ([components.firstObject isEqualToString:[self class].layerType]
+                || [components.firstObject isEqualToString:@"icon"] || [components.firstObject isEqualToString:@"text"]) {
+                [components removeObjectAtIndex:0];
+            }
+#if TEST_STRICT_NAMING_CONVENTIONS
+            XCTAssertTrue([components.firstObject.lexicalClasses containsObject:NSLinguisticTagVerb],
+                          @"Boolean getter %@ that doesn’t start with “is” should contain a verb.", name);
+            XCTAssertNotEqualObjects(components.firstObject.lemma, components.lastObject);
+#endif
+        }
+    } else {
+        XCTAssertFalse([components.firstObject isEqualToString:@"is"]);
+#if TEST_STRICT_NAMING_CONVENTIONS
+        XCTAssertTrue([components.lastObject.lexicalClasses containsObject:NSLinguisticTagNoun],
+                      @"Non-Boolean getter %@ should contain a noun.", name);
+#endif
+    }
+}
+
+@end
+
+@implementation NSString (MGLStyleLayerTestAdditions)
+
+- (NS_ARRAY_OF(NSString *) *)lexicalClasses {
+    NSOrthography *orthography = [NSOrthography orthographyWithDominantScript:@"Latn"
+                                                                  languageMap:@{@"Latn": @[@"en"]}];
+    NSLinguisticTaggerOptions options = (NSLinguisticTaggerOmitPunctuation
+                                         | NSLinguisticTaggerOmitWhitespace
+                                         | NSLinguisticTaggerOmitOther);
+    return [self linguisticTagsInRange:self.mgl_wholeRange
+                                scheme:NSLinguisticTagSchemeLexicalClass
+                               options:options
+                           orthography:orthography
+                           tokenRanges:NULL];
+}
+
+- (NSString *)lemma {
+    NSOrthography *orthography = [NSOrthography orthographyWithDominantScript:@"Latn"
+                                                                  languageMap:@{@"Latn": @[@"en"]}];
+    NSLinguisticTaggerOptions options = (NSLinguisticTaggerOmitPunctuation
+                                         | NSLinguisticTaggerOmitWhitespace
+                                         | NSLinguisticTaggerOmitOther);
+    return [self linguisticTagsInRange:self.mgl_wholeRange
+                                scheme:NSLinguisticTagSchemeLemma
+                               options:options
+                           orthography:orthography
+                           tokenRanges:NULL].firstObject;
+}
+
 @end