diff --git a/src/ui/buttons/styles/responsive.test.js b/src/ui/buttons/styles/responsive.test.js
new file mode 100644
index 000000000..a8becb48a
--- /dev/null
+++ b/src/ui/buttons/styles/responsive.test.js
@@ -0,0 +1,192 @@
+/* @flow */
+
+import { describe, expect, test } from "vitest";
+
+import { BUTTON_COLOR, BUTTON_SIZE } from "../../../constants/button";
+import { BUTTON_SIZE_STYLE } from "../config";
+
+import { getResponsiveStyleVariables } from "./responsive";
+
+// expected legacy responsive styles variables
+const expectedLegacyResponsiveStylesTiny = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.TINY],
+  buttonHeight: 25,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 14,
+  labelHeight: 14,
+  pillBorderRadius: 13,
+};
+
+const expectedLegacyResponsiveStylesSmall = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.SMALL],
+  buttonHeight: 25,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 14,
+  labelHeight: 14,
+  pillBorderRadius: 13,
+};
+
+const expectedLegacyResponsiveStylesMedium = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.MEDIUM],
+  buttonHeight: 35,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 18,
+  labelHeight: 18,
+  pillBorderRadius: 18,
+};
+
+const expectedLegacyResponsiveStylesLarge = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.LARGE],
+  buttonHeight: 45,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 22,
+  labelHeight: 22,
+  pillBorderRadius: 23,
+};
+
+const expectedLegacyResponsiveStylesHuge = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.HUGE],
+  buttonHeight: 55,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 24,
+  labelHeight: 24,
+  pillBorderRadius: 28,
+};
+
+// expected rebranded responsive style variables
+const expectedRebrandedResponsiveStylesTiny = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.TINY],
+  buttonHeight: 25,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 19,
+  labelHeight: 19,
+  pillBorderRadius: 13,
+};
+
+const expectedRebrandedResponsiveStylesSmall = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.SMALL],
+  buttonHeight: 25,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 19,
+  labelHeight: 19,
+  pillBorderRadius: 13,
+};
+
+const expectedRebrandedResponsiveStylesMedium = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.MEDIUM],
+  buttonHeight: 35,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 27,
+  labelHeight: 27,
+  pillBorderRadius: 18,
+};
+
+const expectedRebrandedResponsiveStylesLarge = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.LARGE],
+  buttonHeight: 45,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 34,
+  labelHeight: 34,
+  pillBorderRadius: 23,
+};
+
+const expectedRebrandedResponsiveStylesHuge = {
+  style: BUTTON_SIZE_STYLE[BUTTON_SIZE.HUGE],
+  buttonHeight: 55,
+  minDualWidth: 300,
+  textPercPercentage: 36,
+  smallerLabelHeight: 42,
+  labelHeight: 42,
+  pillBorderRadius: 28,
+};
+
+describe("test responsive style variables for legacy", () => {
+  const experiment = {
+    isPaypalRebrandEnabled: false,
+    defaultBlueButtonColor: BUTTON_COLOR.GOLD,
+  };
+  const fundingEligibility = {
+    paypal: {
+      eligible: true,
+      branded: false,
+    },
+  };
+
+  test.each([
+    { input: BUTTON_SIZE.TINY, expected: expectedLegacyResponsiveStylesTiny },
+    { input: BUTTON_SIZE.SMALL, expected: expectedLegacyResponsiveStylesSmall },
+    {
+      input: BUTTON_SIZE.MEDIUM,
+      expected: expectedLegacyResponsiveStylesMedium,
+    },
+    { input: BUTTON_SIZE.LARGE, expected: expectedLegacyResponsiveStylesLarge },
+    { input: BUTTON_SIZE.HUGE, expected: expectedLegacyResponsiveStylesHuge },
+  ])(
+    `should return legacy responsive styles for size $input`,
+    ({ input, expected }) => {
+      expect(
+        getResponsiveStyleVariables({
+          experiment,
+          fundingEligibility,
+          size: input,
+        })
+      ).toEqual(expected);
+    }
+  );
+});
+
+describe("test responsive style variables for rebrand light blue button", () => {
+  const experiment = {
+    isPaypalRebrandEnabled: true,
+    defaultBlueButtonColor: BUTTON_COLOR.DEFAULT_BLUE_LIGHT_BLUE,
+  };
+  const fundingEligibility = {
+    paypal: {
+      eligible: true,
+      branded: false,
+    },
+  };
+
+  test.each([
+    {
+      input: BUTTON_SIZE.TINY,
+      expected: expectedRebrandedResponsiveStylesTiny,
+    },
+    {
+      input: BUTTON_SIZE.SMALL,
+      expected: expectedRebrandedResponsiveStylesSmall,
+    },
+    {
+      input: BUTTON_SIZE.MEDIUM,
+      expected: expectedRebrandedResponsiveStylesMedium,
+    },
+    {
+      input: BUTTON_SIZE.LARGE,
+      expected: expectedRebrandedResponsiveStylesLarge,
+    },
+    {
+      input: BUTTON_SIZE.HUGE,
+      expected: expectedRebrandedResponsiveStylesHuge,
+    },
+  ])(
+    `should return rebrand responsive styles for size $input`,
+    ({ input, expected }) => {
+      expect(
+        getResponsiveStyleVariables({
+          experiment,
+          fundingEligibility,
+          size: input,
+        })
+      ).toEqual(expected);
+    }
+  );
+});