Merge pull request #885 from Quick/tonever-for-objc

[ObjC] Add `toNever` expectation

Author: ikesyo

Sources/Nimble/Adapters/NMBExpectation.swift

@@ -116,6 +116,34 @@ public class NMBExpectation: NSObject {
         return toEventuallyNotWithDescription
     }
 
+    @objc public var toNever: (NMBPredicate) -> Void {
+        return { predicate in
+            self.expectValue.toNever(
+                from(objcPredicate: predicate),
+                until: self._timeout,
+                description: nil
+            )
+        }
+    }
+
+    @objc public var toNeverWithDescription: (NMBPredicate, String) -> Void {
+        return { predicate, description in
+            self.expectValue.toNever(
+                from(objcPredicate: predicate),
+                until: self._timeout,
+                description: description
+            )
+        }
+    }
+
+    @objc public var neverTo: (NMBPredicate) -> Void {
+        return toNever
+    }
+
+    @objc public var neverToWithDescription: (NMBPredicate, String) -> Void {
+        return toNeverWithDescription
+    }
+
     @objc public class func failWithMessage(_ message: String, file: FileString, line: UInt) {
         fail(message, location: SourceLocation(file: file, line: line))
     }

Tests/NimbleTests/objc/ObjCAsyncTest.m

@@ -57,4 +57,39 @@ - (void)testAsyncCallback {
     });
 }
 
+- (void)testToNeverPositiveMatches {
+    __block id value = @0;
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        value = @1;
+    });
+    expect(value).toNever(beGreaterThan(1));
+
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        value = @0;
+    });
+    expect(value).neverTo(beGreaterThan(1));
+}
+
+- (void)testToNeverNegativeMatches {
+    __block id value = @0;
+    expectFailureMessage(@"expected to never equal <0>, got <0>", ^{
+        expect(value).toNever(equal(0));
+    });
+    expectFailureMessage(@"expected to never equal <0>, got <0>", ^{
+        expect(value).neverTo(equal(0));
+    });
+    expectFailureMessage(@"expected to never equal <1>, got <1>", ^{
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+            value = @1;
+        });
+        expect(value).toNever(equal(1));
+    });
+    expectFailureMessage(@"expected to never equal <1>, got <1>", ^{
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+            value = @1;
+        });
+        expect(value).neverTo(equal(1));
+    });
+}
+
 @end