diff --git a/profile_test.go b/profile_test.go
new file mode 100644
index 0000000..83ddcf8
--- /dev/null
+++ b/profile_test.go
@@ -0,0 +1,56 @@
+package colorprofile
+
+import (
+	"github.com/charmbracelet/x/ansi"
+	"github.com/lucasb-eyer/go-colorful"
+	"testing"
+)
+
+func TestHexTo256(t *testing.T) {
+	testCases := map[string]struct {
+		input          colorful.Color
+		expectedOutput ansi.ExtendedColor
+	}{
+		"white": {
+			input:          colorful.Color{1, 1, 1},
+			expectedOutput: 231,
+		},
+		"offwhite": {
+			input:          colorful.Color{0.9333, 0.9333, 0.933},
+			expectedOutput: 255,
+		},
+		"slightly brighter than offwhite": {
+			input:          colorful.Color{0.95, 0.95, 0.95},
+			expectedOutput: 255,
+		},
+		"red": {
+			input:          colorful.Color{1, 0, 0},
+			expectedOutput: 196,
+		},
+		"silver foil": {
+			input:          colorful.Color{0.6863, 0.6863, 0.6863},
+			expectedOutput: 145,
+		},
+		"silver chalice": {
+			input:          colorful.Color{0.698, 0.698, 0.698},
+			expectedOutput: 249,
+		},
+		"slightly closer to silver foil": {
+			input:          colorful.Color{0.692, 0.692, 0.692},
+			expectedOutput: 145,
+		},
+		"slightly closer to silver chalice": {
+			input:          colorful.Color{0.694, 0.694, 0.694},
+			expectedOutput: 249,
+		},
+	}
+
+	for testName, testCase := range testCases {
+		t.Run(testName, func(t *testing.T) {
+			output := hexToANSI256Color(testCase.input)
+			if output != testCase.expectedOutput {
+				t.Errorf("Expected truecolor %+v to map to 256 color %d, but instead received %d", testCase.input, testCase.expectedOutput, output)
+			}
+		})
+	}
+}