1 files changed, 244 insertions, 0 deletions
diff --git a/std/fs/write_json_test.ts b/std/fs/write_json_test.ts
new file mode 100644
index 000000000..a282d399f
--- /dev/null
+++ b/std/fs/write_json_test.ts
@@ -0,0 +1,244 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { test } from "../testing/mod.ts";
+import {
+  assertEquals,
+  assertThrowsAsync,
+  assertThrows
+} from "../testing/asserts.ts";
+import { writeJson, writeJsonSync } from "./write_json.ts";
+import * as path from "./path/mod.ts";
+
+const testdataDir = path.resolve("fs", "testdata");
+
+test(async function writeJsonIfNotExists(): Promise<void> {
+  const notExistsJsonFile = path.join(testdataDir, "file_not_exists.json");
+
+  await assertThrowsAsync(
+    async (): Promise<void> => {
+      await writeJson(notExistsJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = await Deno.readFile(notExistsJsonFile);
+
+  await Deno.remove(notExistsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(async function writeJsonIfExists(): Promise<void> {
+  const existsJsonFile = path.join(testdataDir, "file_write_exists.json");
+
+  await Deno.writeFile(existsJsonFile, new Uint8Array());
+
+  await assertThrowsAsync(
+    async (): Promise<void> => {
+      await writeJson(existsJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = await Deno.readFile(existsJsonFile);
+
+  await Deno.remove(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(async function writeJsonIfExistsAnInvalidJson(): Promise<void> {
+  const existsInvalidJsonFile = path.join(
+    testdataDir,
+    "file_write_invalid.json"
+  );
+
+  const invalidJsonContent = new TextEncoder().encode("[123}");
+  await Deno.writeFile(existsInvalidJsonFile, invalidJsonContent);
+
+  await assertThrowsAsync(
+    async (): Promise<void> => {
+      await writeJson(existsInvalidJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = await Deno.readFile(existsInvalidJsonFile);
+
+  await Deno.remove(existsInvalidJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(async function writeJsonWithSpaces(): Promise<void> {
+  const existsJsonFile = path.join(testdataDir, "file_write_spaces.json");
+
+  const invalidJsonContent = new TextEncoder().encode();
+  await Deno.writeFile(existsJsonFile, invalidJsonContent);
+
+  await assertThrowsAsync(
+    async (): Promise<void> => {
+      await writeJson(existsJsonFile, { a: "1" }, { spaces: 2 });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = await Deno.readFile(existsJsonFile);
+
+  await Deno.remove(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{\n  "a": "1"\n}`);
+});
+
+test(async function writeJsonWithReplacer(): Promise<void> {
+  const existsJsonFile = path.join(testdataDir, "file_write_replacer.json");
+
+  const invalidJsonContent = new TextEncoder().encode();
+  await Deno.writeFile(existsJsonFile, invalidJsonContent);
+
+  await assertThrowsAsync(
+    async (): Promise<void> => {
+      await writeJson(
+        existsJsonFile,
+        { a: "1", b: "2", c: "3" },
+        {
+          replacer: ["a"]
+        }
+      );
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = await Deno.readFile(existsJsonFile);
+
+  await Deno.remove(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(function writeJsonSyncIfNotExists(): void {
+  const notExistsJsonFile = path.join(testdataDir, "file_not_exists_sync.json");
+
+  assertThrows(
+    (): void => {
+      writeJsonSync(notExistsJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = Deno.readFileSync(notExistsJsonFile);
+
+  Deno.removeSync(notExistsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(function writeJsonSyncIfExists(): void {
+  const existsJsonFile = path.join(testdataDir, "file_write_exists_sync.json");
+
+  Deno.writeFileSync(existsJsonFile, new Uint8Array());
+
+  assertThrows(
+    (): void => {
+      writeJsonSync(existsJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = Deno.readFileSync(existsJsonFile);
+
+  Deno.removeSync(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(function writeJsonSyncIfExistsAnInvalidJson(): void {
+  const existsInvalidJsonFile = path.join(
+    testdataDir,
+    "file_write_invalid_sync.json"
+  );
+
+  const invalidJsonContent = new TextEncoder().encode("[123}");
+  Deno.writeFileSync(existsInvalidJsonFile, invalidJsonContent);
+
+  assertThrows(
+    (): void => {
+      writeJsonSync(existsInvalidJsonFile, { a: "1" });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = Deno.readFileSync(existsInvalidJsonFile);
+
+  Deno.removeSync(existsInvalidJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});
+
+test(function writeJsonWithSpaces(): void {
+  const existsJsonFile = path.join(testdataDir, "file_write_spaces_sync.json");
+
+  const invalidJsonContent = new TextEncoder().encode();
+  Deno.writeFileSync(existsJsonFile, invalidJsonContent);
+
+  assertThrows(
+    (): void => {
+      writeJsonSync(existsJsonFile, { a: "1" }, { spaces: 2 });
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = Deno.readFileSync(existsJsonFile);
+
+  Deno.removeSync(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{\n  "a": "1"\n}`);
+});
+
+test(function writeJsonWithReplacer(): void {
+  const existsJsonFile = path.join(
+    testdataDir,
+    "file_write_replacer_sync.json"
+  );
+
+  const invalidJsonContent = new TextEncoder().encode();
+  Deno.writeFileSync(existsJsonFile, invalidJsonContent);
+
+  assertThrows(
+    (): void => {
+      writeJsonSync(
+        existsJsonFile,
+        { a: "1", b: "2", c: "3" },
+        {
+          replacer: ["a"]
+        }
+      );
+      throw new Error("should write success");
+    },
+    Error,
+    "should write success"
+  );
+
+  const content = Deno.readFileSync(existsJsonFile);
+
+  Deno.removeSync(existsJsonFile);
+
+  assertEquals(new TextDecoder().decode(content), `{"a":"1"}`);
+});