diff --git a/index.js b/index.js
index 25452ce78..394952a5e 100644
--- a/index.js
+++ b/index.js
@@ -11,6 +11,7 @@ const parser = require("./src/parser");
 const printDocToDebug = require("./src/doc-debug").printDocToDebug;
 const config = require("./src/resolve-config");
 const docblock = require("jest-docblock");
+const getStream = require("get-stream");
 
 function guessLineEnding(text) {
   const index = text.indexOf("\n");
@@ -353,6 +354,7 @@ module.exports = {
 
   /* istanbul ignore next */
   __debug: {
+    getStream,
     parse: function(text, opts) {
       return parser.parse(text, opts);
     },
diff --git a/jest.config.js b/jest.config.js
index 506ae3af3..bcfffd316 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -13,5 +13,6 @@ module.exports = {
     "<rootDir>/src/doc-debug.js",
     "<rootDir>/src/clean-ast.js",
     "<rootDir>/src/deprecated.js"
-  ]
+  ],
+  transform: {}
 };
diff --git a/src/cli-util.js b/src/cli-util.js
index a93eea37c..2fd62ba76 100644
--- a/src/cli-util.js
+++ b/src/cli-util.js
@@ -4,7 +4,6 @@ const path = require("path");
 const camelCase = require("camelcase");
 const dashify = require("dashify");
 const minimist = require("minimist");
-const getStream = require("get-stream");
 const fs = require("fs");
 const globby = require("globby");
 const ignore = require("ignore");
@@ -208,7 +207,7 @@ function applyConfigPrecedence(argv, options) {
 }
 
 function formatStdin(argv) {
-  getStream(process.stdin).then(input => {
+  prettier.__debug.getStream(process.stdin).then(input => {
     const filepath = argv["stdin-filepath"]
       ? path.resolve(process.cwd(), argv["stdin-filepath"])
       : process.cwd();
diff --git a/tests/cursor/jsfmt.spec.js b/tests/cursor/jsfmt.spec.js
index e92b0d4e4..6af7a5d1b 100644
--- a/tests/cursor/jsfmt.spec.js
+++ b/tests/cursor/jsfmt.spec.js
@@ -1,4 +1,4 @@
-const prettier = require("../..");
+const prettier = require("../../tests_config/require_prettier");
 
 test("translates cursor correctly in basic case", () => {
   expect(prettier.formatWithCursor(" 1", { cursorOffset: 2 })).toEqual({
diff --git a/tests_config/require_prettier.js b/tests_config/require_prettier.js
new file mode 100644
index 000000000..87a7b1b2d
--- /dev/null
+++ b/tests_config/require_prettier.js
@@ -0,0 +1,6 @@
+"use strict";
+
+const isProduction = process.env.NODE_ENV === "production";
+const prettier = require(isProduction ? "../dist/" : "../");
+
+module.exports = prettier;
diff --git a/tests_config/run_spec.js b/tests_config/run_spec.js
index 5f8532bc0..5c28a505e 100644
--- a/tests_config/run_spec.js
+++ b/tests_config/run_spec.js
@@ -1,9 +1,8 @@
 "use strict";
 
-const isProduction = process.env.NODE_ENV === "production";
 const fs = require("fs");
 const extname = require("path").extname;
-const prettier = require(isProduction ? "../dist/" : "../");
+const prettier = require("./require_prettier");
 const parser = require("../src/parser");
 const massageAST = require("../src/clean-ast.js").massageAST;
 
diff --git a/tests_integration/__tests__/config-resolution.js b/tests_integration/__tests__/config-resolution.js
index fff56fbe5..ef6a8a780 100644
--- a/tests_integration/__tests__/config-resolution.js
+++ b/tests_integration/__tests__/config-resolution.js
@@ -3,7 +3,7 @@
 const path = require("path");
 
 const runPrettier = require("../runPrettier");
-const prettier = require("../../");
+const prettier = require("../../tests_config/require_prettier");
 
 expect.addSnapshotSerializer(require("../path-serializer"));
 
diff --git a/tests_integration/__tests__/early-exit.js b/tests_integration/__tests__/early-exit.js
index d5b073443..19f73beae 100644
--- a/tests_integration/__tests__/early-exit.js
+++ b/tests_integration/__tests__/early-exit.js
@@ -1,6 +1,6 @@
 "use strict";
 
-const prettier = require("../..");
+const prettier = require("../../tests_config/require_prettier");
 const runPrettier = require("../runPrettier");
 const constant = require("../../src/cli-constant");
 
diff --git a/tests_integration/__tests__/parser-api.js b/tests_integration/__tests__/parser-api.js
index c63cee06f..19bdea7d5 100644
--- a/tests_integration/__tests__/parser-api.js
+++ b/tests_integration/__tests__/parser-api.js
@@ -1,6 +1,6 @@
 "use strict";
 
-const prettier = require("../..");
+const prettier = require("../../tests_config/require_prettier");
 const runPrettier = require("../runPrettier");
 
 test("allows custom parser provided as object", () => {
diff --git a/tests_integration/runPrettier.js b/tests_integration/runPrettier.js
index fd43b8df9..1d2e4da0b 100644
--- a/tests_integration/runPrettier.js
+++ b/tests_integration/runPrettier.js
@@ -3,6 +3,10 @@
 const fs = require("fs");
 const path = require("path");
 
+const isProduction = process.env.NODE_ENV === "production";
+const prettierApi = isProduction ? "../dist/index" : "../index";
+const prettierCli = isProduction ? "../dist/bin/prettier" : "../bin/prettier";
+
 function runPrettier(dir, args, options) {
   args = args || [];
   options = options || {};
@@ -11,32 +15,35 @@ function runPrettier(dir, args, options) {
   let stdout = "";
   let stderr = "";
 
-  const spiedProcessExit = jest.spyOn(process, "exit");
-  spiedProcessExit.mockImplementation(exitCode => {
+  jest.spyOn(process, "exit").mockImplementation(exitCode => {
     if (status === undefined) {
       status = exitCode || 0;
     }
   });
 
-  const spiedStdoutWrite = jest.spyOn(process.stdout, "write");
-  spiedStdoutWrite.mockImplementation(text => appendStdout(text));
+  jest
+    .spyOn(process.stdout, "write")
+    .mockImplementation(text => appendStdout(text));
 
-  const spiedStderrWrite = jest.spyOn(process.stderr, "write");
-  spiedStderrWrite.mockImplementation(text => appendStderr(text));
+  jest
+    .spyOn(process.stderr, "write")
+    .mockImplementation(text => appendStderr(text));
 
-  const spiedConsoleLog = jest.spyOn(console, "log");
-  spiedConsoleLog.mockImplementation(text => appendStdout(text + "\n"));
+  jest
+    .spyOn(console, "log")
+    .mockImplementation(text => appendStdout(text + "\n"));
 
-  const spiedConsoleWarn = jest.spyOn(console, "warn");
-  spiedConsoleWarn.mockImplementation(text => appendStderr(text + "\n"));
+  jest
+    .spyOn(console, "warn")
+    .mockImplementation(text => appendStderr(text + "\n"));
 
-  const spiedConsoleError = jest.spyOn(console, "error");
-  spiedConsoleError.mockImplementation(text => appendStderr(text + "\n"));
+  jest
+    .spyOn(console, "error")
+    .mockImplementation(text => appendStderr(text + "\n"));
 
   const write = [];
 
-  const spiedFsWriteFileSync = jest.spyOn(fs, "writeFileSync");
-  spiedFsWriteFileSync.mockImplementation((filename, content) => {
+  jest.spyOn(fs, "writeFileSync").mockImplementation((filename, content) => {
     write.push({ filename, content });
   });
 
@@ -50,12 +57,18 @@ function runPrettier(dir, args, options) {
   process.argv = ["path/to/node", "path/to/prettier/bin"].concat(args);
 
   jest.resetModules();
-  jest.setMock("get-stream", () => ({
-    then: handler => handler(options.input || "")
-  }));
+
+  // We cannot use `jest.setMock("get-stream", impl)` here, because in the
+  // production build everything is bundled into one file so there is no
+  // "get-stream" module to mock.
+  jest
+    .spyOn(require(prettierApi).__debug, "getStream")
+    .mockImplementation(() => ({
+      then: handler => handler(options.input || "")
+    }));
 
   try {
-    require("../bin/prettier");
+    require(prettierCli);
     status = (status === undefined ? process.exitCode : status) || 0;
   } catch (error) {
     status = 1;