facts: move relevant tests into facts package

facts/facts_test.go

@@ -0,0 +1,15 @@
+package facts
+
+import (
+	"testing"
+
+	"golang.org/x/tools/go/analysis/analysistest"
+)
+
+func TestDeprecated(t *testing.T) {
+	analysistest.Run(t, analysistest.TestData(), Deprecated, "Deprecated")
+}
+
+func TestPurity(t *testing.T) {
+	analysistest.Run(t, analysistest.TestData(), Purity, "Purity")
+}

facts/testdata/src/Deprecated/Deprecated.go

@@ -0,0 +1,5 @@
+package pkg
+
+// Deprecated: Don't use this.
+func fn2() { // want fn2:`Deprecated: Don't use this\.`
+}

facts/testdata/src/Purity/CheckPureFunctions.go

@@ -0,0 +1,17 @@
+package pkg
+
+func foo(a, b int) int { return a + b } // want foo:"is pure"
+func bar(a, b int) int {
+	println(a + b)
+	return a + b
+}
+
+func empty()            {}
+func stubPointer() *int { return nil }
+func stubInt() int      { return 0 }
+
+func fn3() {
+	empty()
+	stubPointer()
+	stubInt()
+}

staticcheck/testdata/src/CheckDeprecated_go14/CheckDeprecated.go

@@ -28,7 +28,7 @@ func fn1(err error) {
 }
 
 // Deprecated: Don't use this.
-func fn2() { // want fn2:`Deprecated: Don't use this\.`
+func fn2() {
 	_ = syscall.StringByteSlice("")
 
 	anon := func(x int) {

staticcheck/testdata/src/CheckDeprecated_go18/CheckDeprecated.go

@@ -28,7 +28,7 @@ func fn1(err error) {
 }
 
 // Deprecated: Don't use this.
-func fn2() { // want fn2:`Deprecated: Don't use this\.`
+func fn2() {
 	_ = syscall.StringByteSlice("")
 
 	anon := func(x int) {

staticcheck/testdata/src/CheckPureFunctions/CheckPureFunctions.go

@@ -17,7 +17,7 @@ func fn2() {
 	r.WithContext(context.Background()) // want `is a pure function but its return value is ignored`
 }
 
-func foo(a, b int) int { return a + b } // want foo:"IsPure"
+func foo(a, b int) int { return a + b }
 func bar(a, b int) int {
 	println(a + b)
 	return a + b