simple: don't flag S1002 in tests

Closes gh-320

Author: dominikh

simple/lint.go

@@ -221,6 +221,9 @@ func (c *Checker) LintIfBoolCmp(j *lint.Job) {
 		if (l1-len(r))%2 == 1 {
 			r = "!" + r
 		}
+		if IsInTest(j, node) {
+			return true
+		}
 		j.Errorf(expr, "should omit comparison to bool constant, can be simplified to %s", r)
 		return true
 	}

simple/testdata/src/bool-cmp/bool-cmp_test.go

@@ -0,0 +1,8 @@
+package pkg
+
+import "testing"
+
+func TestFoo(t *testing.T) {
+	if fn1() == true {
+	}
+}