Moved isIn function to a util file

pkg/field/utils_test.go

@@ -0,0 +1,41 @@
+package field
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsIn(t *testing.T) {
+	// Test cases
+	testCases := []struct {
+		name     string
+		input    string
+		inputX   int
+		inputY   int
+		expected bool
+	}{
+		{"minimal0,0", "test_data/minimal.b98", 0, 0, true},
+		{"minimal-1,0", "test_data/minimal.b98", -1, 0, false},
+		{"minimal1,0", "test_data/minimal.b98", 1, 0, false},
+		{"minimal0,-1", "test_data/minimal.b98", 0, -1, false},
+		{"minimal0,1", "test_data/minimal.b98", 0, 1, false},
+		{"hello3,0", "test_data/hello.b98", 3, 0, true},
+		{"hello3,1", "test_data/hello.b98", 3, 1, false},
+		{"factorial0,1", "test_data/factorial.b98", 0, 1, true},
+		{"factorial14,1", "test_data/factorial.b98", 14, 1, true},
+		{"factorial15,1", "test_data/factorial.b98", 15, 1, false},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			file, err := os.Open(tc.input)
+			require.NoError(t, err, "Failed to open file")
+			defer file.Close()
+			field, err := LoadFile(file)
+			valid := field.isIn(tc.inputX, tc.inputY)
+			require.NoError(t, err)
+			require.Equal(t, tc.expected, valid, "Invalid value")
+		})
+	}
+}