1 files changed, 373 insertions, 0 deletions
diff --git a/std/encoding/csv_stringify_test.ts b/std/encoding/csv_stringify_test.ts
new file mode 100644
index 000000000..7cad190fc
--- /dev/null
+++ b/std/encoding/csv_stringify_test.ts
@@ -0,0 +1,373 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { assertEquals, assertThrowsAsync } from "../testing/asserts.ts";
+
+import {
+  Column,
+  DataItem,
+  NEWLINE,
+  stringify,
+  StringifyError,
+  StringifyOptions,
+} from "./csv_stringify.ts";
+
+type StringifyTestCaseBase = {
+  columns: Column[];
+  data: DataItem[];
+  name: string;
+  options?: StringifyOptions;
+};
+
+type StringifyTestCaseError = StringifyTestCaseBase & {
+  errorMessage?: string;
+  // deno-lint-ignore no-explicit-any
+  throwsError: new (...args: any[]) => Error;
+};
+
+type StringifyTestCase = StringifyTestCaseBase & { expected: string };
+
+const stringifyTestCases: (StringifyTestCase | StringifyTestCaseError)[] = [
+  {
+    columns: ["a"],
+    data: [["foo"], ["bar"]],
+    errorMessage: 'Property accessor is not of type "number"',
+    name: "[CSV_stringify] Access array index using string",
+    throwsError: StringifyError,
+  },
+  {
+    columns: [0],
+    data: [["foo"], ["bar"]],
+    errorMessage: [
+      "Separator cannot include the following strings:",
+      '  - U+0022: Quotation mark (")',
+      "  - U+000D U+000A: Carriage Return + Line Feed (\\r\\n)",
+    ].join("\n"),
+    name: "[CSV_stringify] Double quote in separator",
+    options: { separator: '"' },
+    throwsError: StringifyError,
+  },
+  {
+    columns: [0],
+    data: [["foo"], ["bar"]],
+    errorMessage: [
+      "Separator cannot include the following strings:",
+      '  - U+0022: Quotation mark (")',
+      "  - U+000D U+000A: Carriage Return + Line Feed (\\r\\n)",
+    ].join("\n"),
+    name: "[CSV_stringify] CRLF in separator",
+    options: { separator: "\r\n" },
+    throwsError: StringifyError,
+  },
+  {
+    columns: [
+      {
+        fn: (obj) => obj.toUpperCase(),
+        prop: "msg",
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    name: "[CSV_stringify] Transform function",
+    throwsError: TypeError,
+  },
+  {
+    columns: [],
+    data: [],
+    expected: NEWLINE,
+    name: "[CSV_stringify] No data, no columns",
+  },
+  {
+    columns: [],
+    data: [],
+    expected: ``,
+    name: "[CSV_stringify] No data, no columns, no headers",
+    options: { headers: false },
+  },
+  {
+    columns: ["a"],
+    data: [],
+    expected: `a${NEWLINE}`,
+    name: "[CSV_stringify] No data, columns",
+  },
+  {
+    columns: ["a"],
+    data: [],
+    expected: ``,
+    name: "[CSV_stringify] No data, columns, no headers",
+    options: { headers: false },
+  },
+  {
+    columns: [],
+    data: [{ a: 1 }, { a: 2 }],
+    expected: `${NEWLINE}${NEWLINE}${NEWLINE}`,
+    name: "[CSV_stringify] Data, no columns",
+  },
+  {
+    columns: [0, 1],
+    data: [["foo", "bar"], ["baz", "qux"]],
+    expected: `0\r1${NEWLINE}foo\rbar${NEWLINE}baz\rqux${NEWLINE}`,
+    name: "[CSV_stringify] Separator: CR",
+    options: { separator: "\r" },
+  },
+  {
+    columns: [0, 1],
+    data: [["foo", "bar"], ["baz", "qux"]],
+    expected: `0\n1${NEWLINE}foo\nbar${NEWLINE}baz\nqux${NEWLINE}`,
+    name: "[CSV_stringify] Separator: LF",
+    options: { separator: "\n" },
+  },
+  {
+    columns: [1],
+    data: [{ 1: 1 }, { 1: 2 }],
+    expected: `1${NEWLINE}1${NEWLINE}2${NEWLINE}`,
+    name: "[CSV_stringify] Column: number accessor, Data: object",
+  },
+  {
+    columns: [{ header: "Value", prop: "value" }],
+    data: [{ value: "foo" }, { value: "bar" }],
+    expected: `foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Explicit header value, no headers",
+    options: { headers: false },
+  },
+  {
+    columns: [1],
+    data: [["key", "foo"], ["key", "bar"]],
+    expected: `1${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: number accessor, Data: array",
+  },
+  {
+    columns: [[1]],
+    data: [{ 1: 1 }, { 1: 2 }],
+    expected: `1${NEWLINE}1${NEWLINE}2${NEWLINE}`,
+    name: "[CSV_stringify] Column: array number accessor, Data: object",
+  },
+  {
+    columns: [[1]],
+    data: [["key", "foo"], ["key", "bar"]],
+    expected: `1${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: array number accessor, Data: array",
+  },
+  {
+    columns: [[1, 1]],
+    data: [["key", ["key", "foo"]], ["key", ["key", "bar"]]],
+    expected: `1${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: array number accessor, Data: array",
+  },
+  {
+    columns: ["value"],
+    data: [{ value: "foo" }, { value: "bar" }],
+    expected: `value${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: string accessor, Data: object",
+  },
+  {
+    columns: [["value"]],
+    data: [{ value: "foo" }, { value: "bar" }],
+    expected: `value${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: array string accessor, Data: object",
+  },
+  {
+    columns: [["msg", "value"]],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `value${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Column: array string accessor, Data: object",
+  },
+  {
+    columns: [
+      {
+        header: "Value",
+        prop: ["msg", "value"],
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `Value${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Explicit header",
+  },
+  {
+    columns: [
+      {
+        fn: (str: string) => str.toUpperCase(),
+        prop: ["msg", "value"],
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `value${NEWLINE}FOO${NEWLINE}BAR${NEWLINE}`,
+    name: "[CSV_stringify] Transform function 1",
+  },
+  {
+    columns: [
+      {
+        fn: (str: string) => Promise.resolve(str.toUpperCase()),
+        prop: ["msg", "value"],
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `value${NEWLINE}FOO${NEWLINE}BAR${NEWLINE}`,
+    name: "[CSV_stringify] Transform function 1 async",
+  },
+  {
+    columns: [
+      {
+        fn: (obj: { value: string }) => obj.value,
+        prop: "msg",
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `msg${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Transform function 2",
+  },
+  {
+    columns: [
+      {
+        fn: (obj: { value: string }) => obj.value,
+        header: "Value",
+        prop: "msg",
+      },
+    ],
+    data: [{ msg: { value: "foo" } }, { msg: { value: "bar" } }],
+    expected: `Value${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Transform function 2, explicit header",
+  },
+  {
+    columns: [0],
+    data: [[{ value: "foo" }], [{ value: "bar" }]],
+    expected:
+      `0${NEWLINE}"{""value"":""foo""}"${NEWLINE}"{""value"":""bar""}"${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: object",
+  },
+  {
+    columns: [0],
+    data: [
+      [[{ value: "foo" }, { value: "bar" }]],
+      [[{ value: "baz" }, { value: "qux" }]],
+    ],
+    expected:
+      `0${NEWLINE}"[{""value"":""foo""},{""value"":""bar""}]"${NEWLINE}"[{""value"":""baz""},{""value"":""qux""}]"${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: arary of objects",
+  },
+  {
+    columns: [0],
+    data: [[["foo", "bar"]], [["baz", "qux"]]],
+    expected:
+      `0${NEWLINE}"[""foo"",""bar""]"${NEWLINE}"[""baz"",""qux""]"${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: array",
+  },
+  {
+    columns: [0],
+    data: [[["foo", "bar"]], [["baz", "qux"]]],
+    expected:
+      `0${NEWLINE}"[""foo"",""bar""]"${NEWLINE}"[""baz"",""qux""]"${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: array, separator: tab",
+    options: { separator: "\t" },
+  },
+  {
+    columns: [0],
+    data: [[], []],
+    expected: `0${NEWLINE}${NEWLINE}${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: undefined",
+  },
+  {
+    columns: [0],
+    data: [[null], [null]],
+    expected: `0${NEWLINE}${NEWLINE}${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: null",
+  },
+  {
+    columns: [0],
+    data: [[0xa], [0xb]],
+    expected: `0${NEWLINE}10${NEWLINE}11${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: hex number",
+  },
+  {
+    columns: [0],
+    data: [[BigInt("1")], [BigInt("2")]],
+    expected: `0${NEWLINE}1${NEWLINE}2${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: BigInt",
+  },
+  {
+    columns: [0],
+    data: [[true], [false]],
+    expected: `0${NEWLINE}true${NEWLINE}false${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: boolean",
+  },
+  {
+    columns: [0],
+    data: [["foo"], ["bar"]],
+    expected: `0${NEWLINE}foo${NEWLINE}bar${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: string",
+  },
+  {
+    columns: [0],
+    data: [[Symbol("foo")], [Symbol("bar")]],
+    expected: `0${NEWLINE}Symbol(foo)${NEWLINE}Symbol(bar)${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: symbol",
+  },
+  {
+    columns: [0],
+    data: [[(n: number) => n]],
+    expected: `0${NEWLINE}(n) => n${NEWLINE}`,
+    name: "[CSV_stringify] Targeted value: function",
+  },
+  {
+    columns: [0],
+    data: [['foo"']],
+    expected: `0${NEWLINE}"foo"""${NEWLINE}`,
+    name: "[CSV_stringify] Value with double quote",
+  },
+  {
+    columns: [0],
+    data: [["foo\r\n"]],
+    expected: `0${NEWLINE}"foo\r\n"${NEWLINE}`,
+    name: "[CSV_stringify] Value with CRLF",
+  },
+  {
+    columns: [0],
+    data: [["foo\r"]],
+    expected: `0${NEWLINE}foo\r${NEWLINE}`,
+    name: "[CSV_stringify] Value with CR",
+  },
+  {
+    columns: [0],
+    data: [["foo\n"]],
+    expected: `0${NEWLINE}foo\n${NEWLINE}`,
+    name: "[CSV_stringify] Value with LF",
+  },
+  {
+    columns: [0],
+    data: [["foo,"]],
+    expected: `0${NEWLINE}"foo,"${NEWLINE}`,
+    name: "[CSV_stringify] Value with comma",
+  },
+  {
+    columns: [0],
+    data: [["foo,"]],
+    expected: `0${NEWLINE}foo,${NEWLINE}`,
+    name: "[CSV_stringify] Value with comma, tab separator",
+    options: { separator: "\t" },
+  },
+];
+
+for (const tc of stringifyTestCases) {
+  if ((tc as StringifyTestCaseError).throwsError) {
+    const t = tc as StringifyTestCaseError;
+    Deno.test({
+      async fn() {
+        await assertThrowsAsync(
+          async () => {
+            await stringify(t.data, t.columns, t.options);
+          },
+          t.throwsError,
+          t.errorMessage,
+        );
+      },
+      name: t.name,
+    });
+  } else {
+    const t = tc as StringifyTestCase;
+    Deno.test({
+      async fn() {
+        const actual = await stringify(t.data, t.columns, t.options);
+        assertEquals(actual, t.expected);
+      },
+      name: t.name,
+    });
+  }
+}