Recognize t.try() assertion

Fixes #272

Author: novemberborn

Diff for: rules/assertion-arguments.js

@@ -115,6 +115,14 @@ const create = context => {
 				return;
 			}
 
+			if (members[0] === 'try') {
+				if (gottenArgs < 1) {
+					report(node, 'Not enough arguments. Expected at least 1.');
+				}
+
+				return;
+			}
+
 			const nArgs = expectedNbArguments[members[0]];
 
 			if (!nArgs) {

Diff for: test/assertion-arguments.js

@@ -105,6 +105,9 @@ ruleTester.run('assertion-arguments', rule, {
 		testCase('always', 't.is.skip(\'same\', \'same\', \'message\');'),
 		testCase('always', 't.snapshot(value, \'message\');'),
 		testCase('always', 't.timeout(100);'),
+		testCase('always', 't.try(tt => tt.pass());'),
+		testCase('always', 't.try(tt => tt.pass(), 1, 2);'),
+		testCase('always', 't.try(\'title\', tt => tt.pass(), 1, 2);'),
 
 		// Shouldn't be triggered since it's not a test file
 		testCase('always', 't.true(true);', [], false),
@@ -134,6 +137,10 @@ ruleTester.run('assertion-arguments', rule, {
 		testCase('never', 't.is.skip(\'same\', \'same\');'),
 		testCase('never', 't.snapshot(value);'),
 		testCase('never', 't.timeout(100);'),
+		testCase('never', 't.try(tt => tt.pass());'),
+		testCase('never', 't.try(tt => tt.pass(), 1, 2);'),
+		testCase('never', 't.try(\'title\', tt => tt.pass(), 1, 2);'),
+
 		// Shouldn't be triggered since it's not a test file
 		testCase('never', 't.true(true, \'message\');', [], false),
 
@@ -181,6 +188,7 @@ ruleTester.run('assertion-arguments', rule, {
 		testCase(false, 't.is.skip(\'same\');', tooFewError(2)),
 		testCase(false, 't.snapshot();', tooFewError(1)),
 		testCase(false, 't.timeout();', tooFewError(1)),
+		testCase(false, 't.try();', tooFewError(1)),
 
 		// Too many arguments
 		testCase(false, 't.plan(1, \'extra argument\');', tooManyError(1)),

Diff for: test/use-t-well.js

@@ -65,6 +65,10 @@ ruleTester.run('use-t-well', rule, {
 		testCase('t.context.foo(a, a);'),
 		testCase('foo.t.bar(a, a);'),
 		testCase('t.timeout(100);'),
+		testCase('t.try(tt => tt.pass())'),
+		testCase('t.try(tt => tt.pass(), 1, 2)'),
+		testCase('t.try(\'title\', tt => tt.pass())'),
+		testCase('t.try(\'title\', tt => tt.pass(), 1, 2)'),
 		// Shouldn't be triggered since it's not a test file
 		testCase('t.foo(a, a);', false),
 		testCase('t.foo;', false)

Diff for: util.js

@@ -116,7 +116,8 @@ const assertionMethodsNumArguments = new Map([
 	['throws', 1],
 	['throwsAsync', 1],
 	['true', 1],
-	['truthy', 1]
+	['truthy', 1],
+	['try', 1]
 ]);
 
 const assertionMethodNames = [...assertionMethodsNumArguments.keys()];