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packages/collection/test/iterable_zip_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:collection";
+import "package:collection/iterable_zip.dart";
+import "package:test/test.dart";
+
+/// Iterable like [base] except that it throws when value equals [errorValue].
+Iterable iterError(Iterable base, int errorValue) {
+  return base.map((x) => x == errorValue ? throw "BAD" : x);
+}
+
+main() {
+  test("Basic", () {
+    expect(new IterableZip([[1, 2, 3], [4, 5, 6], [7, 8, 9]]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Uneven length 1", () {
+    expect(new IterableZip([[1, 2, 3, 99, 100], [4, 5, 6], [7, 8, 9]]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Uneven length 2", () {
+    expect(new IterableZip([[1, 2, 3], [4, 5, 6, 99, 100], [7, 8, 9]]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Uneven length 3", () {
+    expect(new IterableZip([[1, 2, 3], [4, 5, 6], [7, 8, 9, 99, 100]]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Uneven length 3", () {
+    expect(new IterableZip([[1, 2, 3, 98], [4, 5, 6], [7, 8, 9, 99, 100]]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Empty 1", () {
+    expect(new IterableZip([[], [4, 5, 6], [7, 8, 9]]), equals([]));
+  });
+
+  test("Empty 2", () {
+    expect(new IterableZip([[1, 2, 3], [], [7, 8, 9]]), equals([]));
+  });
+
+  test("Empty 3", () {
+    expect(new IterableZip([[1, 2, 3], [4, 5, 6], []]), equals([]));
+  });
+
+  test("Empty source", () {
+    expect(new IterableZip([]), equals([]));
+  });
+
+  test("Single Source", () {
+    expect(new IterableZip([[1, 2, 3]]), equals([[1], [2], [3]]));
+  });
+
+  test("Not-lists", () {
+    // Use other iterables than list literals.
+    Iterable it1 = [1, 2, 3, 4, 5, 6].where((x) => x < 4);
+    Set it2 = new LinkedHashSet()..add(4)..add(5)..add(6);
+    Iterable it3 = (new LinkedHashMap()..[7] = 0 ..[8] = 0 ..[9] = 0).keys;
+    Iterable<Iterable> allIts =
+        new Iterable.generate(3, (i) => [it1, it2, it3][i]);
+    expect(new IterableZip(allIts),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+
+  test("Error 1", () {
+    expect(() => new IterableZip([iterError([1, 2, 3], 2),
+                                  [4, 5, 6],
+                                  [7, 8, 9]]).toList(),
+           throwsA(equals("BAD")));
+  });
+
+  test("Error 2", () {
+    expect(() => new IterableZip([[1, 2, 3],
+                                  iterError([4, 5, 6], 5),
+                                  [7, 8, 9]]).toList(),
+           throwsA(equals("BAD")));
+  });
+
+  test("Error 3", () {
+    expect(() => new IterableZip([[1, 2, 3],
+                                  [4, 5, 6],
+                                  iterError([7, 8, 9], 8)]).toList(),
+           throwsA(equals("BAD")));
+  });
+
+  test("Error at end", () {
+    expect(() => new IterableZip([[1, 2, 3],
+                                  iterError([4, 5, 6], 6),
+                                  [7, 8, 9]]).toList(),
+           throwsA(equals("BAD")));
+  });
+
+  test("Error before first end", () {
+    expect(() => new IterableZip([iterError([1, 2, 3, 4], 4),
+                                  [4, 5, 6],
+                                  [7, 8, 9]]).toList(),
+           throwsA(equals("BAD")));
+  });
+
+  test("Error after first end", () {
+    expect(new IterableZip([[1, 2, 3],
+                            [4, 5, 6],
+                            iterError([7, 8, 9, 10], 10)]),
+           equals([[1, 4, 7], [2, 5, 8], [3, 6, 9]]));
+  });
+}