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tests/utils.test.js

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+const smpp = require("smpp");
+const { splitToParts, verifyExists, getCharacterSizeForEncoding } = require("../utils");
+
+describe("splitToParts", () => {
+	// A pdu is expected to be one part if it has less than 160 characters and is encoded using GSM7 (data_coding = null or 0)
+	// Given a pdu with short_message length less than 160 chars, it should return an array with a single pdu.
+	it("should return an array with a single pdu when short_message length is less than or equal to maxMessageSizeBits", () => {
+		const pdu = new smpp.PDU("deliver_sm", {
+			short_message: "test message",
+		});
+		const result = splitToParts(pdu);
+		expect(result.length).toBe(1);
+	});
+
+	// Given a pdu with short_message length greater than 160 chars, it should return an array with 2 pdus.
+	it("should return an array with two pdus when short_message length is greater than maxMessageSizeBits and less than or equal to maxMessageSizeBits * 2", () => {
+		const pdu = new smpp.PDU("deliver_sm", {
+			short_message: "c".repeat(200),
+		});
+		const result = splitToParts(pdu);
+		expect(result.length).toBe(2);
+	});
+
+	// Given a pdu with short_message length greater than 320 chars, it should return an array with 2 pdus.
+	it("should return an array with three pdus when short_message length is greater than maxMessageSizeBits * 2 and less than or equal to maxMessageSizeBits * 3", () => {
+		const pdu = new smpp.PDU("deliver_sm", {
+			short_message: "c".repeat(400),
+		});
+		const result = splitToParts(pdu);
+		expect(result.length).toBe(3);
+	});
+
+	// Given a pdu with short_message length equal to 0, it should return an empty array.
+	it("should return an empty array when short_message length is equal to 0", () => {
+		const pdu = new smpp.PDU("deliver_sm", {
+			short_message: "",
+		});
+		const result = splitToParts(pdu);
+		expect(result.length).toBe(0);
+	});
+
+	// Given a pdu with short_message length equal to 320, it should return an array with two pdus.
+	it("should return an array with two pdus when short_message length is equal to maxMessageSizeBits", () => {
+		const pdu = new smpp.PDU("deliver_sm", {
+			short_message: "c".repeat(320),
+		});
+		const result = splitToParts(pdu);
+		expect(result.length).toBe(2);
+	});
+});
+
+describe("getCharacterSizeForEncoding", () => {
+	// Returns 7 when data_coding is 0
+	it("should return 7 when data_coding is 0", () => {
+		const pdu = { data_coding: 0 };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(7);
+	});
+
+	// Returns 8 when data_coding is 1
+	it("should return 8 when data_coding is 1", () => {
+		const pdu = { data_coding: 1 };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(8);
+	});
+
+	// Returns 16 when data_coding is 8
+	it("should return 16 when data_coding is 8", () => {
+		const pdu = { data_coding: 8 };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(16);
+	});
+
+	// Returns 7 when data_coding is null
+	it("should return 0 when data_coding is null", () => {
+		const pdu = { data_coding: null };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(7);
+	});
+
+	// Returns 0 when data_coding is not a number
+	it("should return 0 when data_coding is not a number", () => {
+		const pdu = { data_coding: "abc" };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(0);
+	});
+
+	// Returns 0 when data_coding is negative
+	it("should return 0 when data_coding is negative", () => {
+		const pdu = { data_coding: -1 };
+		const result = getCharacterSizeForEncoding(pdu);
+		expect(result).toBe(0);
+	});
+});