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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// @flow
+
+/**
+ * This file is for use by unit tests for isolated debugger components that do
+ * not need to interact with the redux store. When these tests need to construct
+ * debugger objects, these interfaces should be used instead of plain object
+ * literals.
+ */
+
+import type {
+  ActorId,
+  Breakpoint,
+  DisplaySource,
+  Expression,
+  Frame,
+  FrameId,
+  Scope,
+  Source,
+  SourceId,
+  SourceWithContentAndType,
+  SourceWithContent,
+  TextSourceContent,
+  URL,
+  WasmSourceContent,
+  Why,
+  Thread,
+} from "../types";
+import * as asyncValue from "./async-value";
+
+import { initialState } from "../reducers/index";
+
+import type { SourceBase } from "../reducers/sources";
+import type { State } from "../reducers/types";
+import type { FulfilledValue } from "./async-value";
+
+function makeMockSource(url: URL = "url", id: SourceId = "source"): SourceBase {
+  return {
+    id,
+    url,
+    isBlackBoxed: false,
+    isPrettyPrinted: false,
+    relativeUrl: url,
+    isWasm: false,
+    extensionName: null,
+    isExtension: false,
+    isOriginal: id.includes("originalSource"),
+  };
+}
+
+function makeMockDisplaySource(
+  url: URL = "url",
+  id: SourceId = "source"
+): DisplaySource {
+  return {
+    ...makeMockSource(url, id),
+    displayURL: url,
+  };
+}
+
+function makeMockSourceWithContent(
+  url?: string,
+  id?: SourceId,
+  contentType?: string = "text/javascript",
+  text?: string = ""
+): SourceWithContent {
+  const source = makeMockSource(url, id);
+
+  return {
+    ...source,
+    content: text
+      ? asyncValue.fulfilled({
+          type: "text",
+          value: text,
+          contentType,
+        })
+      : null,
+  };
+}
+
+function makeMockSourceAndContent(
+  url?: string,
+  id?: SourceId,
+  contentType?: string = "text/javascript",
+  text: string = ""
+): { ...SourceBase, content: TextSourceContent } {
+  const source = makeMockSource(url, id);
+
+  return {
+    ...source,
+    content: {
+      type: "text",
+      value: text,
+      contentType,
+    },
+  };
+}
+
+function makeFullfilledMockSourceContent(
+  text: string = "",
+  contentType?: string = "text/javascript"
+): FulfilledValue<TextSourceContent> {
+  return asyncValue.fulfilled({
+    type: "text",
+    value: text,
+    contentType,
+  });
+}
+
+function makeMockWasmSource(): SourceBase {
+  return {
+    id: "wasm-source-id",
+    url: "url",
+    isBlackBoxed: false,
+    isPrettyPrinted: false,
+    relativeUrl: "url",
+    isWasm: true,
+    extensionName: null,
+    isExtension: false,
+    isOriginal: false,
+  };
+}
+
+function makeMockWasmSourceWithContent(text: {|
+  binary: Object,
+|}): SourceWithContentAndType<WasmSourceContent> {
+  const source = makeMockWasmSource();
+
+  return {
+    ...source,
+    content: asyncValue.fulfilled({
+      type: "wasm",
+      value: text,
+    }),
+  };
+}
+
+function makeMockScope(
+  actor: ActorId = "scope-actor",
+  type: string = "block",
+  parent: ?Scope = null
+): Scope {
+  return {
+    actor,
+    parent,
+    bindings: {
+      arguments: [],
+      variables: {},
+    },
+    object: null,
+    function: null,
+    type,
+    scopeKind: "",
+  };
+}
+
+function mockScopeAddVariable(scope: Scope, name: string) {
+  if (!scope.bindings) {
+    throw new Error("no scope bindings");
+  }
+  scope.bindings.variables[name] = { value: null };
+}
+
+function makeMockBreakpoint(
+  source: Source = makeMockSource(),
+  line: number = 1,
+  column: ?number
+): Breakpoint {
+  const location = column
+    ? { sourceId: source.id, line, column }
+    : { sourceId: source.id, line };
+  return {
+    id: "breakpoint",
+    location,
+    astLocation: null,
+    generatedLocation: location,
+    disabled: false,
+    text: "text",
+    originalText: "text",
+    options: {},
+  };
+}
+
+function makeMockFrame(
+  id: FrameId = "frame",
+  source: Source = makeMockSource("url"),
+  scope: Scope = makeMockScope(),
+  line: number = 4,
+  displayName: string = `display-${id}`,
+  index: number = 0
+): Frame {
+  const location = { sourceId: source.id, line };
+  return {
+    id,
+    thread: "FakeThread",
+    displayName,
+    location,
+    generatedLocation: location,
+    source,
+    scope,
+    this: {},
+    index,
+    asyncCause: null,
+    state: "on-stack",
+    type: "call",
+  };
+}
+
+function makeMockFrameWithURL(url: URL): Frame {
+  return makeMockFrame(undefined, makeMockSource(url));
+}
+
+function makeWhyNormal(frameReturnValue: any = undefined): Why {
+  if (frameReturnValue) {
+    return { type: "why-normal", frameFinished: { return: frameReturnValue } };
+  }
+  return { type: "why-normal" };
+}
+
+function makeWhyThrow(frameThrowValue: any): Why {
+  return { type: "why-throw", frameFinished: { throw: frameThrowValue } };
+}
+
+function makeMockExpression(value: Object): Expression {
+  return {
+    input: "input",
+    value,
+    from: "from",
+    updating: false,
+  };
+}
+
+// Mock contexts for use in tests that do not create a redux store.
+const mockcx = { navigateCounter: 0 };
+const mockthreadcx = {
+  navigateCounter: 0,
+  thread: "FakeThread",
+  pauseCounter: 0,
+  isPaused: false,
+};
+
+function makeMockThread(fields: $Shape<Thread>) {
+  return {
+    actor: "test",
+    url: "example.com",
+    type: "worker",
+    name: "test",
+    ...fields,
+  };
+}
+
+function makeMockState(state: $Shape<State>) {
+  return {
+    ...initialState(),
+    ...state,
+  };
+}
+
+export {
+  makeMockDisplaySource,
+  makeMockSource,
+  makeMockSourceWithContent,
+  makeMockSourceAndContent,
+  makeMockWasmSource,
+  makeMockWasmSourceWithContent,
+  makeMockScope,
+  mockScopeAddVariable,
+  makeMockBreakpoint,
+  makeMockFrame,
+  makeMockFrameWithURL,
+  makeWhyNormal,
+  makeWhyThrow,
+  makeMockExpression,
+  mockcx,
+  mockthreadcx,
+  makeMockState,
+  makeMockThread,
+  makeFullfilledMockSourceContent,
+};