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src/functions/join/join.spec.ts

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+import { Readable } from "stream";
+import test from "ava";
+import { expect } from "chai";
+import { join } from ".";
+
+test.cb("join() joins chunks using the specified separator", t => {
+    t.plan(9);
+    const source = new Readable({ objectMode: true });
+    const expectedParts = ["ab|", "|", "c|d", "|", "|", "|", "e", "|", "|f|"];
+    let i = 0;
+    source
+        .pipe(join("|"))
+        .on("data", part => {
+            expect(part).to.equal(expectedParts[i]);
+            t.pass();
+            i++;
+        })
+        .on("error", t.end)
+        .on("end", t.end);
+
+    source.push("ab|");
+    source.push("c|d");
+    source.push("|");
+    source.push("e");
+    source.push("|f|");
+    source.push(null);
+});
+
+test.cb(
+    "join() joins chunks using the specified separator without breaking up multi-byte characters " +
+        "spanning multiple chunks",
+    t => {
+        t.plan(5);
+        const source = new Readable({ objectMode: true });
+        const expectedParts = ["ø", "|", "ö", "|", "一"];
+        let i = 0;
+        source
+            .pipe(join("|"))
+            .on("data", part => {
+                expect(part).to.equal(expectedParts[i]);
+                t.pass();
+                i++;
+            })
+            .on("error", t.end)
+            .on("end", t.end);
+
+        source.push(Buffer.from("ø").slice(0, 1)); // 2-byte character spanning two chunks
+        source.push(Buffer.from("ø").slice(1, 2));
+        source.push(Buffer.from("ö").slice(0, 1)); // 2-byte character spanning two chunks
+        source.push(Buffer.from("ö").slice(1, 2));
+        source.push(Buffer.from("一").slice(0, 1)); // 3-byte character spanning three chunks
+        source.push(Buffer.from("一").slice(1, 2));
+        source.push(Buffer.from("一").slice(2, 3));
+        source.push(null);
+    },
+);