suite: fix deadlock in suite.Require()/Assert()

suite/suite.go

@@ -58,7 +58,7 @@ func (suite *Suite) Require() *require.Assertions {
 	suite.mu.Lock()
 	defer suite.mu.Unlock()
 	if suite.require == nil {
-		suite.require = require.New(suite.T())
+		panic("'Require' must not be called before 'Run' or 'SetT'")
 	}
 	return suite.require
 }
@@ -72,7 +72,7 @@ func (suite *Suite) Assert() *assert.Assertions {
 	suite.mu.Lock()
 	defer suite.mu.Unlock()
 	if suite.Assertions == nil {
-		suite.Assertions = assert.New(suite.T())
+		panic("'Assert' must not be called before 'Run' or 'SetT'")
 	}
 	return suite.Assertions
 }

suite/suite_test.go

@@ -692,3 +692,27 @@ func TestSubtestPanic(t *testing.T) {
 	assert.True(t, suite.inTearDownTest)
 	assert.True(t, suite.inTearDownSuite)
 }
+
+type unInitialisedSuite struct {
+	Suite
+}
+
+// TestUnInitialisedSuites asserts the behaviour of the suite methods when the
+// suite is not initialised
+func TestUnInitialisedSuites(t *testing.T) {
+	t.Run("should panic on Require", func(t *testing.T) {
+		suite := new(unInitialisedSuite)
+
+		assert.Panics(t, func() {
+			suite.Require().True(true)
+		})
+	})
+
+	t.Run("should panic on Assert", func(t *testing.T) {
+		suite := new(unInitialisedSuite)
+
+		assert.Panics(t, func() {
+			suite.Assert().True(true)
+		})
+	})
+}