Export RunBp2BuildTestCaseSimple() in testing.go

This is to support the migration of conversion tests to be next
to the files they're testing

Bug: 242070498
Test: m bp2build
Change-Id: I66243d420743273e7ebad70886cfe690740182c4
diff --git a/bp2build/python_binary_conversion_test.go b/bp2build/python_binary_conversion_test.go
index 59055aa..e8b9bc4 100644
--- a/bp2build/python_binary_conversion_test.go
+++ b/bp2build/python_binary_conversion_test.go
@@ -62,7 +62,7 @@
 }
 
 func TestPythonBinaryHostPy2(t *testing.T) {
-	runBp2BuildTestCaseSimple(t, Bp2buildTestCase{
+	RunBp2BuildTestCaseSimple(t, Bp2buildTestCase{
 		Description:                "py2 python_binary_host",
 		ModuleTypeUnderTest:        "python_binary_host",
 		ModuleTypeUnderTestFactory: python.PythonBinaryHostFactory,
@@ -96,7 +96,7 @@
 }
 
 func TestPythonBinaryHostPy3(t *testing.T) {
-	runBp2BuildTestCaseSimple(t, Bp2buildTestCase{
+	RunBp2BuildTestCaseSimple(t, Bp2buildTestCase{
 		Description:                "py3 python_binary_host",
 		ModuleTypeUnderTest:        "python_binary_host",
 		ModuleTypeUnderTestFactory: python.PythonBinaryHostFactory,
@@ -130,7 +130,7 @@
 }
 
 func TestPythonBinaryHostArchVariance(t *testing.T) {
-	runBp2BuildTestCaseSimple(t, Bp2buildTestCase{
+	RunBp2BuildTestCaseSimple(t, Bp2buildTestCase{
 		Description:                "test arch variants",
 		ModuleTypeUnderTest:        "python_binary_host",
 		ModuleTypeUnderTestFactory: python.PythonBinaryHostFactory,