diff --git a/check/test.go b/check/test.go
index 2f7a288..b6bed04 100644
--- a/check/test.go
+++ b/check/test.go
@@ -23,6 +23,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/golang/glog"
 	yaml "gopkg.in/yaml.v2"
 	"k8s.io/client-go/util/jsonpath"
 )
@@ -123,8 +124,8 @@ func (t *testItem) execute(s string) *testOutput {
 						}
 					}
 				} else {
-					fmt.Fprintf(os.Stderr, "invalid flag in testitem definition")
-					os.Exit(1)
+					glog.V(1).Infof(fmt.Sprintf("invalid flag in testitem definition"))
+					return failTestItem("error invalid flag in testitem definition")
 				}
 			}
 
@@ -170,8 +171,8 @@ func compareOp(tCompareOp string, flagVal string, tCompareValue string) (string,
 	case "gt", "gte", "lt", "lte":
 		a, b, err := toNumeric(flagVal, tCompareValue)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "Not numeric value - flag: %q - compareValue: %q %v\n", flagVal, tCompareValue, err)
-			os.Exit(1)
+			glog.V(1).Infof(fmt.Sprintf("Not numeric value - flag: %q - compareValue: %q %v\n", flagVal, tCompareValue, err))
+			return "Invalid Number(s) used for comparison", false
 		}
 		switch tCompareOp {
 		case "gt":
@@ -213,10 +214,14 @@ func compareOp(tCompareOp string, flagVal string, tCompareValue string) (string,
 	case "bitmask":
 		expectedResultPattern = "bitmask '%s' AND '%s'"
 		requested, err := strconv.ParseInt(flagVal, 8, 64)
+		if err != nil {
+			glog.V(1).Infof(fmt.Sprintf("Not numeric value - flag: %q - compareValue: %q %v\n", flagVal, tCompareValue, err))
+			return fmt.Sprintf("Not numeric value - flag: %s", flagVal), false
+		}
 		max, err := strconv.ParseInt(tCompareValue, 8, 64)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "Not numeric value - flag: %q - compareValue: %q %v\n", flagVal, tCompareValue, err)
-			os.Exit(1)
+			glog.V(1).Infof(fmt.Sprintf("Not numeric value - flag: %q - compareValue: %q %v\n", flagVal, tCompareValue, err))
+			return fmt.Sprintf("Not numeric value - flag: %s", tCompareValue), false
 		}
 		testResult = (max & requested) == requested
 	}
@@ -330,8 +335,9 @@ func (ts *tests) execute(s string) *testOutput {
 	// If no binary operation is specified, default to AND
 	switch ts.BinOp {
 	default:
-		fmt.Fprintf(os.Stderr, "unknown binary operator for tests %s\n", ts.BinOp)
-		os.Exit(1)
+		glog.V(2).Info(fmt.Sprintf("unknown binary operator for tests %s\n", ts.BinOp))
+		finalOutput.actualResult = fmt.Sprintf("unknown binary operator for tests %s\n", ts.BinOp)
+		return finalOutput
 	case and, "":
 		result = true
 		for i := range res {
diff --git a/check/test_test.go b/check/test_test.go
index ccd596f..55c3e1e 100644
--- a/check/test_test.go
+++ b/check/test_test.go
@@ -531,11 +531,9 @@ func TestCompareOp(t *testing.T) {
 			testResult:            true},
 
 		// Test Op "gt"
-		// TODO: test for non-numeric values.
-		//        toNumeric function currently uses os.Exit, which stops tests.
-		// {label: "op=gt, both empty", op: "gt", flagVal: "",
-		// 	compareValue: "", expectedResultPattern: "'' is greater than ''",
-		// 	testResult: true},
+		{label: "op=gt, both empty", op: "gt", flagVal: "",
+			compareValue: "", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
 		{label: "op=gt, 0 > 0", op: "gt", flagVal: "0",
 			compareValue: "0", expectedResultPattern: "0 is greater than 0",
 			testResult: false},
@@ -548,109 +546,124 @@ func TestCompareOp(t *testing.T) {
 		{label: "op=gt, 5 > 5", op: "gt", flagVal: "5",
 			compareValue: "5", expectedResultPattern: "5 is greater than 5",
 			testResult: false},
-
+		{label: "op=gt, Pikachu > 5", op: "gt", flagVal: "Pikachu",
+			compareValue: "5", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=gt, 5 > Bulbasaur", op: "gt", flagVal: "5",
+			compareValue: "Bulbasaur", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
 		// Test Op "lt"
-		// TODO: test for non-numeric values.
-		//        toNumeric function currently uses os.Exit, which stops tests.
-		// {label: "op=lt, both empty", op: "lt", flagVal: "",
-		// 	compareValue: "", expectedResultPattern: "'' is lower than ''",
-		// 	testResult: true},
-		{label: "op=gt, 0 < 0", op: "lt", flagVal: "0",
+		{label: "op=lt, both empty", op: "lt", flagVal: "",
+			compareValue: "", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=lt, 0 < 0", op: "lt", flagVal: "0",
 			compareValue: "0", expectedResultPattern: "0 is lower than 0",
 			testResult: false},
-		{label: "op=gt, 4 < 5", op: "lt", flagVal: "4",
+		{label: "op=lt, 4 < 5", op: "lt", flagVal: "4",
 			compareValue: "5", expectedResultPattern: "4 is lower than 5",
 			testResult: true},
-		{label: "op=gt, 5 < 4", op: "lt", flagVal: "5",
+		{label: "op=lt, 5 < 4", op: "lt", flagVal: "5",
 			compareValue: "4", expectedResultPattern: "5 is lower than 4",
 			testResult: false},
-		{label: "op=gt, 5 < 5", op: "lt", flagVal: "5",
+		{label: "op=lt, 5 < 5", op: "lt", flagVal: "5",
 			compareValue: "5", expectedResultPattern: "5 is lower than 5",
 			testResult: false},
-
+		{label: "op=lt, Charmander < 5", op: "lt", flagVal: "Charmander",
+			compareValue: "5", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=lt, 5 < Charmeleon", op: "lt", flagVal: "5",
+			compareValue: "Charmeleon", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
 		// Test Op "gte"
-		// TODO: test for non-numeric values.
-		//        toNumeric function currently uses os.Exit, which stops tests.
-		// {label: "op=gt, both empty", op: "gte", flagVal: "",
-		// 	compareValue: "", expectedResultPattern: "'' is greater or equal to ''",
-		// 	testResult: true},
-		{label: "op=gt, 0 >= 0", op: "gte", flagVal: "0",
+		{label: "op=gte, both empty", op: "gte", flagVal: "",
+			compareValue: "", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=gte, 0 >= 0", op: "gte", flagVal: "0",
 			compareValue: "0", expectedResultPattern: "0 is greater or equal to 0",
 			testResult: true},
-		{label: "op=gt, 4 >= 5", op: "gte", flagVal: "4",
+		{label: "op=gte, 4 >= 5", op: "gte", flagVal: "4",
 			compareValue: "5", expectedResultPattern: "4 is greater or equal to 5",
 			testResult: false},
-		{label: "op=gt, 5 >= 4", op: "gte", flagVal: "5",
+		{label: "op=gte, 5 >= 4", op: "gte", flagVal: "5",
 			compareValue: "4", expectedResultPattern: "5 is greater or equal to 4",
 			testResult: true},
-		{label: "op=gt, 5 >= 5", op: "gte", flagVal: "5",
+		{label: "op=gte, 5 >= 5", op: "gte", flagVal: "5",
 			compareValue: "5", expectedResultPattern: "5 is greater or equal to 5",
 			testResult: true},
-
+		{label: "op=gte, Ekans >= 5", op: "gte", flagVal: "Ekans",
+			compareValue: "5", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=gte, 4 >= Zubat", op: "gte", flagVal: "4",
+			compareValue: "Zubat", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
 		// Test Op "lte"
-		// TODO: test for non-numeric values.
-		//        toNumeric function currently uses os.Exit, which stops tests.
-		// {label: "op=gt, both empty", op: "lte", flagVal: "",
-		// 	compareValue: "", expectedResultPattern: "'' is lower or equal to ''",
-		// 	testResult: true},
-		{label: "op=gt, 0 <= 0", op: "lte", flagVal: "0",
+		{label: "op=lte, both empty", op: "lte", flagVal: "",
+			compareValue: "", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=lte, 0 <= 0", op: "lte", flagVal: "0",
 			compareValue: "0", expectedResultPattern: "0 is lower or equal to 0",
 			testResult: true},
-		{label: "op=gt, 4 <= 5", op: "lte", flagVal: "4",
+		{label: "op=lte, 4 <= 5", op: "lte", flagVal: "4",
 			compareValue: "5", expectedResultPattern: "4 is lower or equal to 5",
 			testResult: true},
-		{label: "op=gt, 5 <= 4", op: "lte", flagVal: "5",
+		{label: "op=lte, 5 <= 4", op: "lte", flagVal: "5",
 			compareValue: "4", expectedResultPattern: "5 is lower or equal to 4",
 			testResult: false},
-		{label: "op=gt, 5 <= 5", op: "lte", flagVal: "5",
+		{label: "op=lte, 5 <= 5", op: "lte", flagVal: "5",
 			compareValue: "5", expectedResultPattern: "5 is lower or equal to 5",
 			testResult: true},
+		{label: "op=lte, Venomoth <= 4", op: "lte", flagVal: "Venomoth",
+			compareValue: "4", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
+		{label: "op=lte, 5 <= Meowth", op: "lte", flagVal: "5",
+			compareValue: "Meowth", expectedResultPattern: "Invalid Number(s) used for comparison",
+			testResult: false},
 
 		// Test Op "has"
-		{label: "op=gt, both empty", op: "has", flagVal: "",
+		{label: "op=has, both empty", op: "has", flagVal: "",
 			compareValue: "", expectedResultPattern: "'' has ''",
 			testResult: true},
-		{label: "op=gt, flagVal=empty", op: "has", flagVal: "",
+		{label: "op=has, flagVal=empty", op: "has", flagVal: "",
 			compareValue: "blah", expectedResultPattern: "'' has 'blah'",
 			testResult: false},
-		{label: "op=gt, compareValue=empty", op: "has", flagVal: "blah",
+		{label: "op=has, compareValue=empty", op: "has", flagVal: "blah",
 			compareValue: "", expectedResultPattern: "'blah' has ''",
 			testResult: true},
-		{label: "op=gt, 'blah' has 'la'", op: "has", flagVal: "blah",
+		{label: "op=has, 'blah' has 'la'", op: "has", flagVal: "blah",
 			compareValue: "la", expectedResultPattern: "'blah' has 'la'",
 			testResult: true},
-		{label: "op=gt, 'blah' has 'LA'", op: "has", flagVal: "blah",
+		{label: "op=has, 'blah' has 'LA'", op: "has", flagVal: "blah",
 			compareValue: "LA", expectedResultPattern: "'blah' has 'LA'",
 			testResult: false},
-		{label: "op=gt, 'blah' has 'lo'", op: "has", flagVal: "blah",
+		{label: "op=has, 'blah' has 'lo'", op: "has", flagVal: "blah",
 			compareValue: "lo", expectedResultPattern: "'blah' has 'lo'",
 			testResult: false},
 
 		// Test Op "nothave"
-		{label: "op=gt, both empty", op: "nothave", flagVal: "",
+		{label: "op=nothave, both empty", op: "nothave", flagVal: "",
 			compareValue: "", expectedResultPattern: " '' not have ''",
 			testResult: false},
-		{label: "op=gt, flagVal=empty", op: "nothave", flagVal: "",
+		{label: "op=nothave, flagVal=empty", op: "nothave", flagVal: "",
 			compareValue: "blah", expectedResultPattern: " '' not have 'blah'",
 			testResult: true},
-		{label: "op=gt, compareValue=empty", op: "nothave", flagVal: "blah",
+		{label: "op=nothave, compareValue=empty", op: "nothave", flagVal: "blah",
 			compareValue: "", expectedResultPattern: " 'blah' not have ''",
 			testResult: false},
-		{label: "op=gt, 'blah' not have 'la'", op: "nothave", flagVal: "blah",
+		{label: "op=nothave, 'blah' not have 'la'", op: "nothave", flagVal: "blah",
 			compareValue: "la", expectedResultPattern: " 'blah' not have 'la'",
 			testResult: false},
-		{label: "op=gt, 'blah' not have 'LA'", op: "nothave", flagVal: "blah",
+		{label: "op=nothave, 'blah' not have 'LA'", op: "nothave", flagVal: "blah",
 			compareValue: "LA", expectedResultPattern: " 'blah' not have 'LA'",
 			testResult: true},
-		{label: "op=gt, 'blah' not have 'lo'", op: "nothave", flagVal: "blah",
+		{label: "op=nothave, 'blah' not have 'lo'", op: "nothave", flagVal: "blah",
 			compareValue: "lo", expectedResultPattern: " 'blah' not have 'lo'",
 			testResult: true},
 
 		// Test Op "regex"
-		{label: "op=gt, both empty", op: "regex", flagVal: "",
+		{label: "op=regex, both empty", op: "regex", flagVal: "",
 			compareValue: "", expectedResultPattern: " '' matched by ''",
 			testResult: true},
-		{label: "op=gt, flagVal=empty", op: "regex", flagVal: "",
+		{label: "op=regex, flagVal=empty", op: "regex", flagVal: "",
 			compareValue: "blah", expectedResultPattern: " '' matched by 'blah'",
 			testResult: false},
 
@@ -679,6 +692,12 @@ func TestCompareOp(t *testing.T) {
 		{label: "op=bitmask, 644 AND 211", op: "bitmask", flagVal: "211",
 			compareValue: "644", expectedResultPattern: "bitmask '211' AND '644'",
 			testResult: false},
+		{label: "op=bitmask, Harry AND 211", op: "bitmask", flagVal: "Harry",
+			compareValue: "644", expectedResultPattern: "Not numeric value - flag: Harry",
+			testResult: false},
+		{label: "op=bitmask, 644 AND Potter", op: "bitmask", flagVal: "211",
+			compareValue: "Potter", expectedResultPattern: "Not numeric value - flag: Potter",
+			testResult: false},
 	}
 
 	for _, c := range cases {