JACOBIN-552 Adding unit test for cpUtils

src/classloader/cpUtils_test.go

@@ -11,6 +11,7 @@ import (
  "jacobin/globals"
  "jacobin/log"
  "jacobin/types"
+ "math"
  "os"
  "testing"
 )
@@ -108,7 +109,7 @@ func TestGetClassNameFromCPclassref(t *testing.T) {
  // Initialize classloaders and method area
  err := Init()
  if err != nil {
- t.Errorf("Failure to load classes in TestMeInfoFromMethRefValid")
+ t.Errorf("Failure to load classes in TestGetClassNameFromCPclassref")
  }
  LoadBaseClasses() // must follow classloader.Init()
 
@@ -140,6 +141,8 @@ func TestGetClassNameFromCPclassref(t *testing.T) {
 }
 
 func TestFetchCPentry(t *testing.T) {
+ globals.InitGlobals("test")
+
  cp := FetchCPentry(nil, 6)
  if cp.RetType != IS_ERROR {
  t.Errorf("Expect IS_ERROR, got %d", cp.RetType)
@@ -166,6 +169,12 @@ func TestFetchCPentry(t *testing.T) {
  CP.CpIndex[0] = CpEntry{Type: 0, Slot: 0} // mandatory dummy entry
  CP.CpIndex[1] = CpEntry{Type: IntConst, Slot: 0}
  CP.CpIndex[2] = CpEntry{Type: LongConst, Slot: 0}
+ CP.CpIndex[3] = CpEntry{Type: StringConst, Slot: 4}
+ CP.CpIndex[4] = CpEntry{Type: UTF8, Slot: 0}
+ CP.CpIndex[5] = CpEntry{Type: MethodType, Slot: 0}
+ CP.CpIndex[6] = CpEntry{Type: FloatConst, Slot: 0}
+ CP.CpIndex[7] = CpEntry{Type: DoubleConst, Slot: 0}
+ CP.CpIndex[8] = CpEntry{Type: ClassRef, Slot: 0}
 
  CP.IntConsts = []int32{25}
  cp = FetchCPentry(&CP, 1)
@@ -179,4 +188,39 @@ func TestFetchCPentry(t *testing.T) {
  t.Errorf("Expect IS_INT64 with value of 250, got %d with value of %d", cp.RetType, cp.IntVal)
  }
 
+ CP.Utf8Refs = []string{"Hello from Jacobin JVM!"}
+ cp = FetchCPentry(&CP, 3) // get the string const that points to the string in Utf8Refs[0]
+ if cp.RetType != IS_STRING_ADDR || *cp.StringVal != "Hello from Jacobin JVM!" {
+ t.Errorf("Expect IS_STRING_ADDR pointing to 'Hello from Jacobin JVM!', got %s", *cp.StringVal)
+ } // when this passes, we know that StringConst and UTF8 both work
+
+ CP.MethodTypes = []uint16{24}
+ cp = FetchCPentry(&CP, 5)
+ if cp.RetType != IS_INT64 || cp.IntVal != int64(24) {
+ t.Errorf("Expect IS_INT64 with value of 24, got %d with value of %d", cp.RetType, cp.IntVal)
+ }
+
+ CP.Floats = []float32{float32(24.100000)}
+ cp = FetchCPentry(&CP, 6)
+ if cp.RetType != IS_FLOAT64 || math.Abs(24.1-cp.FloatVal) > 0.001 {
+ t.Errorf("Expected IS_FLOAT64 with value of 24.1, got %d with value of %f", cp.RetType, cp.FloatVal)
+ }
+
+ CP.Doubles = []float64{24.20}
+ cp = FetchCPentry(&CP, 7)
+ if cp.RetType != IS_FLOAT64 || math.Abs(24.20-cp.FloatVal) > 0.001 {
+ t.Errorf("Expected IS_FLOAT64 with value of 24.2, got %d with value of %f", cp.RetType, cp.FloatVal)
+ }
+
+ err := Init()
+ if err != nil {
+ t.Errorf("Failure to load classes in TestFetchCPentry")
+ }
+ LoadBaseClasses() // must follow classloader.Init()
+ CP.ClassRefs = []uint32{types.StringPoolStringIndex}
+ cp = FetchCPentry(&CP, 8)
+ if cp.RetType != IS_STRING_ADDR || *cp.StringVal != "java/lang/String" {
+ t.Errorf("Expected IS_STRING_ADDR pointing to 'java/lang/String', got %d pointing to %s",
+ cp.RetType, *cp.StringVal)
+ }
 }