Generate HTMLKit's Tree Construction tests dynamically for better failure reporting

TODO: refactor dynamic tests generation into helper class/method

HTMLKitTests/HTMLKitTreeConstructionTests.m

@@ -7,6 +7,7 @@
 //
 
 #import <XCTest/XCTest.h>
+#import <objc/runtime.h>
 
 #import "HTMLKitTestObserver.h"
 #import "HTML5LibTreeConstructionTest.h"
@@ -50,37 +51,40 @@
 
 + (void)addTestCaseForTestFile:(NSString *)testFile withTests:(NSArray *)tests toTestSuite:(XCTestSuite *)suite
 {
-	NSArray *allInvocations = [self testInvocations];
-	for (NSInvocation *invocation in allInvocations) {
-		XCTestCase *testCase = [[self alloc] initWithInvocation:invocation
-													   testName:testFile
-														  tests:tests];
-		[suite addTest:testCase];
-	}
+	IMP implementation = imp_implementationWithBlock(^ (HTMLKitTreeConstructionTests *instance){
+		[instance runTests];
+	});
+	const char *types = [[NSString stringWithFormat:@"%s%s%s", @encode(id), @encode(id), @encode(SEL)] UTF8String];
+
+	NSString *testName = [testFile.stringByDeletingPathExtension stringByReplacingOccurrencesOfString:@"-" withString:@"_"];
+	NSString *selectorName = [NSString stringWithFormat:@"testPareser__%@", testName];
+	SEL selector = NSSelectorFromString(selectorName);
+	class_addMethod(self, selector, implementation, types);
+
+	NSMethodSignature *signature = [self instanceMethodSignatureForSelector:selector];
+	NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
+	invocation.selector = selector;
+
+	XCTestCase *testCase = [[self alloc] initWithInvocation:invocation tests:tests];
+	[suite addTest:testCase];
 }
 
 #pragma mark - Instance
 
-- (instancetype)initWithInvocation:(NSInvocation *)invocation
-						  testName:(NSString *)testName
-							 tests:(NSArray *)tests
+- (instancetype)initWithInvocation:(NSInvocation *)invocation tests:(NSArray *)tests
 {
 	self = [super initWithInvocation:invocation];
 	if (self) {
-		_testName = testName;
 		_testsList = tests;
 	}
 	return self;
 }
 
-- (NSString *)name
+- (NSString *)description
 {
-	NSInvocation *invocation = [self invocation];
-	NSString *title = self.testName.stringByDeletingPathExtension;
-	return [NSString stringWithFormat:@"-[%@ %@_%@]", self.class, NSStringFromSelector(invocation.selector), title];
+	return self.name;
 }
 
-- (NSString *)description
 #pragma mark - Setup
 
 - (void)setUp
@@ -102,13 +106,15 @@
 
 #pragma mark - Tests
 
-- (void)testParser
+- (void)runTests
 {
 	for (HTML5LibTreeConstructionTest *test in self.testsList) {
+		NSString *testInput = test.data;
+
+		[_observer addCaseForHTML5LibTestWithInput:testInput];
+
+		HTMLParser *parser = [[HTMLParser alloc] initWithString:testInput];
 		HTMLElement *contextElement = test.documentFragment;
-
-		HTMLParser *parser = [[HTMLParser alloc] initWithString:test.data];
-
 		NSArray *actual = nil;
 		if (contextElement == nil) {
 			actual = [parser parseDocument].childNodes.array;