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How to use LetHook class of com.greghaskins.spectrum.internal.hooks package

Best Spectrum code snippet using com.greghaskins.spectrum.internal.hooks.LetHook

Source:Specification.java

...9import com.greghaskins.spectrum.ThrowingSupplier;10import com.greghaskins.spectrum.internal.DeclarationState;11import com.greghaskins.spectrum.internal.Suite;12import com.greghaskins.spectrum.internal.blocks.IdempotentBlock;13import com.greghaskins.spectrum.internal.hooks.EagerLetHook;14import com.greghaskins.spectrum.internal.hooks.Hook;15import com.greghaskins.spectrum.internal.hooks.HookContext.AppliesTo;16import com.greghaskins.spectrum.internal.hooks.HookContext.Precedence;17import com.greghaskins.spectrum.internal.hooks.LetHook;18import org.junit.AssumptionViolatedException;19import java.util.function.Supplier;20public interface Specification {21  /**22   * Declare a test suite that describes the expected behavior of the system in a given context.23   *24   * @param context Description of the context for this suite25   * @param block   {@link Block} with one or more calls to {@link #it(String, Block) it} that26   *                define each expected behavior27   */28  static void describe(final String context, final Block block) {29    final Suite suite = DeclarationState.instance()30        .getCurrentSuiteBeingDeclared()31        .addSuite(context);32    suite.applyConfigurationFromBlock(block);33    DeclarationState.instance().beginDeclaration(suite, block);34  }35  /**36   * Focus on this specific suite, while ignoring others.37   *38   * @param context Description of the context for this suite39   * @param block   {@link Block} with one or more calls to {@link #it(String, Block) it} that40   *                define each expected behavior41   * @see #describe(String, Block)42   */43  static void fdescribe(final String context, final Block block) {44    describe(context, with(focus(), block));45  }46  /**47   * Ignore the specific suite.48   *49   * @param context Description of the context for this suite50   * @param block   {@link Block} with one or more calls to {@link #it(String, Block) it} that51   *                define each expected behavior52   * @see #describe(String, Block)53   */54  static void xdescribe(final String context, final Block block) {55    describe(context, with(ignore(), block));56  }57  /**58   * Declare a spec, or test, for an expected behavior of the system in this suite context.59   *60   * @param behavior Description of the expected behavior61   * @param block    {@link Block} that verifies the system behaves as expected and throws a {@link62   *                 java.lang.Throwable Throwable} if that expectation is not met.63   */64  static void it(final String behavior, final Block block) {65    DeclarationState.instance().getCurrentSuiteBeingDeclared().addSpec(behavior, block);66  }67  /**68   * Declare a pending spec (without a block) that will be ignored.69   *70   * @param behavior Description of the expected behavior71   * @see #xit(String, Block)72   */73  static void it(final String behavior) {74    DeclarationState.instance().getCurrentSuiteBeingDeclared().addSpec(behavior, null).ignore();75  }76  /**77   * Focus on this specific spec, while ignoring others.78   *79   * @param behavior Description of the expected behavior80   * @param block    {@link Block} that verifies the system behaves as expected and throws a {@link81   *                 java.lang.Throwable Throwable} if that expectation is not met.82   * @see #it(String, Block)83   */84  static void fit(final String behavior, final Block block) {85    it(behavior, with(focus(), block));86  }87  /**88   * Mark a spec as ignored so that it will be skipped.89   *90   * @param behavior Description of the expected behavior91   * @param block    {@link Block} that will not run, since this spec is ignored.92   * @see #it(String, Block)93   */94  static void xit(final String behavior, final Block block) {95    it(behavior);96  }97  /**98   * Declare a {@link Block} to be run before each spec in the suite.99   *100   * <p>101   * Use this to perform setup actions that are common across tests in the context. If multiple102   * {@code beforeEach} blocks are declared, they will run in declaration order.103   * </p>104   *105   * @param block {@link Block} to run once before each spec106   */107  static void beforeEach(final Block block) {108    DeclarationState.instance().addHook(before(block), AppliesTo.ATOMIC_ONLY, Precedence.LOCAL);109  }110  /**111   * Declare a {@link Block Block} to be run after each spec in the current suite.112   *113   * <p>114   * Use this to perform teardown or cleanup actions that are common across specs in this suite. If115   * multiple {@code afterEach} blocks are declared, they will run in declaration order.116   * </p>117   *118   * @param block {@link Block Block} to run once after each spec119   */120  static void afterEach(final Block block) {121    DeclarationState.instance().addHook(after(block), AppliesTo.ATOMIC_ONLY,122        Precedence.GUARANTEED_CLEAN_UP_LOCAL);123  }124  /**125   * Declare a {@link Block Block} to be run once before all the specs in the current suite begin.126   *127   * <p>128   * Use {@code beforeAll} and {@link #afterAll(Block) afterAll} blocks with caution: since they129   * only run once, shared state <strong>will</strong> leak across specs.130   * </p>131   *132   * @param block {@link Block} to run once before all specs in this suite133   */134  static void beforeAll(final Block block) {135    DeclarationState.instance().addHook(before(new IdempotentBlock(block)), AppliesTo.ATOMIC_ONLY,136        Precedence.SET_UP);137  }138  /**139   * Declare a {@link Block} to be run once after all the specs in the current suite have run.140   *141   * <p>142   * Use {@link #beforeAll(Block) beforeAll} and {@code afterAll} blocks with caution: since they143   * only run once, shared state <strong>will</strong> leak across tests.144   * </p>145   *146   * @param block {@link Block} to run once after all specs in this suite147   */148  static void afterAll(final Block block) {149    DeclarationState.instance().addHook(after(block), AppliesTo.ONCE,150        Precedence.GUARANTEED_CLEAN_UP_GLOBAL);151  }152  /**153   * A value that will be fresh within each spec and cannot bleed across specs.154   *155   * <p>156   * Note that {@code let} is lazy-evaluated: the {@code supplier} is not called until the first157   * time it is used.158   * </p>159   *160   * @param <T>      The type of value161   * @param supplier {@link ThrowingSupplier} function that either generates the value, or throws a162   *                 {@link Throwable}163   * @return supplier which is refreshed for each spec's context164   */165  static <T> Supplier<T> let(final ThrowingSupplier<T> supplier) {166    LetHook<T> letHook = new LetHook<>(supplier);167    DeclarationState.instance().addHook(letHook, AppliesTo.ATOMIC_ONLY, Precedence.LOCAL);168    return letHook;169  }170  /**171   * A value that will be calculated fresh at the start of each spec and cannot bleed across specs.172   *173   * <p>174   * Note that {@code eagerLet} is eagerly evaluated: the {@code supplier} is called at the start175   * of the spec, before {@code beforeEach} blocks.176   * </p>177   *178   * @param <T>      The type of value179   * @param supplier {@link ThrowingSupplier} function that either generates the value, or throws a180   *                 {@link Throwable}181   * @return supplier which is refreshed for each spec's context182   */183  static <T> Supplier<T> eagerLet(final ThrowingSupplier<T> supplier) {184    EagerLetHook<T> eagerLetHook = new EagerLetHook<>(supplier);185    DeclarationState.instance().addHook(eagerLetHook, AppliesTo.ATOMIC_ONLY, Precedence.LOCAL);186    return eagerLetHook;187  }188  /**189   * Define a test context. Alias for {@link #describe}.190   *191   * @param context the description of the context192   * @param block   the block to execute193   */194  static void context(final String context, final Block block) {195    describe(context, block);196  }197  /**198   * Define a focused test context. Alias for {@link #fdescribe}.199   *200   * @param context the description of the context...

Source:LetHook.java

...16 * <p>Values are lazily initialized and then cached, so a value is not calculated until the first17 * time it is needed in a given test. Subsequent fetches of the value within the same test will18 * return the cached value.19 */20public class LetHook<T> implements SupplyingHook<T> {21  private final ThrowingSupplier<T> supplier;22  private final Variable<T> cachedValue = new Variable<>();23  private boolean isCached;24  public LetHook(final ThrowingSupplier<T> supplier) {25    this.supplier = supplier;26    this.isCached = false;27  }28  @Override29  public void accept(final Description description,30      final RunReporting<Description, Failure> reporting, final Block block)31      throws Throwable {32    try {33      block.run();34    } finally {35      clear();36    }37  }38  @Override...

Source:EagerLetHook.java

2import com.greghaskins.spectrum.ThrowingSupplier;3/**4 * Implementation of an eager version of {@code let}.5 *6 * <p>Sematics are the same as with {@link LetHook}, except that all values are calculated at the7 * start of the test, rather than on an as-needed basis.8 */9public class EagerLetHook<T> extends AbstractSupplyingHook<T> {10  private final ThrowingSupplier<T> supplier;11  public EagerLetHook(final ThrowingSupplier<T> supplier) {12    this.supplier = supplier;13  }14  protected T before() {15    return supplier.get();16  }17  protected String getExceptionMessageIfUsedAtDeclarationTime() {18    return "Cannot use the value from eagerLet() in a suite declaration. "19        + "It may only be used in the context of a running spec.";20  }21}...

LetHook

Using AI Code Generation

1import com.greghaskins.spectrum.internal.hooks.LetHook;2import com.greghaskins.spectrum.internal.hooks.LetHookContext;3import com.greghaskins.spectrum.internal.hooks.LetHookScope;4import org.junit.Test;5import static org.junit.Assert.assertEquals;6public class LetHookTest {7    public void testLetHook() {8        LetHookScope scope = new LetHookScope();9        scope.add(new LetHook() {10            public void run(LetHookContext context) {11                context.add("foo", "bar");12                context.run();13            }14        });15        scope.add(new LetHook() {16            public void run(LetHookContext context) {17                context.add("foo", "baz");18                context.run();19            }20        });21        scope.run(() -> {22            assertEquals("baz", scope.get("foo"));23        });24    }25}26import com.greghaskins.spectrum.internal.hooks.LetHook;27import com.greghaskins.spectrum.internal.hooks.LetHookContext;28import com.greghaskins.spectrum.internal.hooks.LetHookScope;29import org.junit.Test;30import static org.junit.Assert.assertEquals;31public class LetHookTest {32    public void testLetHook() {33        LetHookScope scope = new LetHookScope();34        scope.add(new LetHook() {35            public void run(LetHookContext context) {36                context.add("foo", "bar");37                context.run();38            }39        });40        scope.add(new LetHook() {41            public void run(LetHookContext context) {42                context.add("foo", "baz");43                context.run();44            }45        });46        scope.run(() -> {47            assertEquals("baz", scope.get("foo"));48        });49    }50}51import com.greghaskins.spectrum.internal.hooks.LetHook;52import com.greghaskins.spectrum.internal.hooks.LetHookContext;53import com.greghaskins.spectrum.internal.hooks.LetHookScope;54import org.junit.Test;55import static org

LetHook

Using AI Code Generation

1import com.greghaskins.spectrum.Spectrum;2import com.greghaskins.spectrum.Spectrum.*;3import com.greghaskins.spectrum.internal.hooks.LetHook;4public class LetHookTest {5    public static void main(String[] args) {6        Spectrum.describe("LetHook test", () -> {7            Spectrum.let("a", () -> {8                return "a";9            });10            Spectrum.let("b", () -> {11                return "b";12            });13            Spectrum.let("c", () -> {14                return "c";15            });16            Spectrum.let("d", () -> {17                return "d";18            });19            Spectrum.let("e", () -> {20                return "e";21            });22            Spectrum.let("f", () -> {23                return "f";24            });25            Spectrum.let("g", () -> {26                return "g";27            });28            Spectrum.let("h", () -> {29                return "h";30            });31            Spectrum.let("i", () -> {32                return "i";33            });34            Spectrum.let("j", () -> {35                return "j";36            });37            Spectrum.let("k", () -> {38                return "k";39            });40            Spectrum.let("l", () -> {41                return "l";42            });43            Spectrum.let("m", () -> {44                return "m";45            });46            Spectrum.let("n", () -> {47                return "n";48            });49            Spectrum.let("o", () -> {50                return "o";51            });52            Spectrum.let("p", () -> {53                return "p";54            });55            Spectrum.let("q", () -> {56                return "q";57            });58            Spectrum.let("r", () -> {59                return "r";60            });61            Spectrum.let("s", () -> {62                return "s";63            });64            Spectrum.let("t", () -> {65                return "t";66            });67            Spectrum.let("u", () -> {68                return "u";69            });70            Spectrum.let("v", () -> {71                return "v";72            });73            Spectrum.let("w", () -> {74                return "w";75            });76            Spectrum.let("x", () -> {77                return "x";78            });79            Spectrum.let("y", () -> {80                return "y";81            });82            Spectrum.let("z

LetHook

Using AI Code Generation

1public class LetHookTest {2    public void testLetHook() {3        final LetHook<String> hook = LetHook.create("hello");4        final String value = hook.getValue();5        assertThat(value, is("hello"));6    }7}8public class LetHookTest {9    public void testLetHook() {10        final LetHook<String> hook = LetHook.create("hello");11        final String value = hook.getValue();12        assertThat(value, is("hello"));13    }14}

LetHook

Using AI Code Generation

1public class 1 {2    public void test1() {3        System.out.println("test1");4    }5    public void test2() {6        System.out.println("test2");7    }8    public void test3() {9        System.out.println("test3");10    }11}12public class 2 {13    public void test1() {14        System.out.println("test1");15    }16    public void test2() {17        System.out.println("test2");18    }19    public void test3() {20        System.out.println("test3");21    }22}23public class 3 {24    public void test1() {25        System.out.println("test1");26    }27    public void test2() {28        System.out.println("test2");29    }30    public void test3() {31        System.out.println("test3");32    }33}34public class 4 {35    public void test1() {36        System.out.println("test1");37    }38    public void test2() {39        System.out.println("test2");40    }41    public void test3() {42        System.out.println("test3");43    }44}

LetHook

Using AI Code Generation

1import com.greghaskins.spectrum.Let;2import com.greghaskins.spectrum.Spectrum;3import com.greghaskins.spectrum.internal.hooks.LetHook;4import org.junit.runner.RunWith;5import java.util.function.Supplier;6import static com.greghaskins.spectrum.Spectrum.*;7import static org.hamcrest.CoreMatchers.*;8import static org.junit.Assert.*;9@RunWith(Spectrum.class)10public class LetHookTest {11    {12        describe("let", () -> {13            it("can be used as a hook", () -> {14                LetHook<String> hook = new LetHook<>(() -> "foo");15                Supplier<String> let = Let.hook(hook);16                assertThat(let.get(), is("foo"));17            });18        });19    }20}

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