cpp-case-matcher/test/match_test.cxx

//
//  match.t.h
//  case-matcher
//
//  Created by Sam Jaffe on 2/3/17.
//

#include <gmock/gmock.h>

#include "match/match.hpp"

struct example {
  example(long in) : i(in) {}
  long i;
};

bool operator==(example const & a, example const & b) {
  return a.i == b.i;
}
bool operator<(example const & a, example const & b) {
  return a.i < b.i;
}

struct CaseMatcherTest : public testing::Test {
  example const ex{1};
  bool const b{true};
};

using ::testing::Eq;
using ::testing::Not;

MATCHER(IsUnmatched, negation ? "was matched" : "was not matched") {
  return arg.unmatched();
}

TEST_F(CaseMatcherTest, MatchesCorrectValue) {
  match(ex, b) {
    with(example{1}, true) {
    } nomatch() {
      FAIL() << "Unable to match";
    }
  } else {
    FAIL() << "Unable to construct matcher";
  }
}


TEST_F(CaseMatcherTest, ImmediatlySetsMatchedProperty) {
  match(ex, b) {
    with(example{1}, true) {
      EXPECT_THAT(_matcher_local, Not(IsUnmatched()));
    }
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, NonMatchingClauseLeavesUnmatched) {
  match(ex, b) {
    with(example{1}, false) {
      FAIL() << "Incorrect match!";
    }
    EXPECT_THAT(_matcher_local, IsUnmatched());
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, SetsAsMatchedIfAnyClausePasses) {
  match(ex, b) {
    with(example{1}, false) {
      FAIL() << "Incorrect match!";
    }

    with(example{1}, true) {}
    EXPECT_THAT(_matcher_local, Not(IsUnmatched()));
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, CanMatchWithWildcard) {
  match(ex, b) {
    with(example{1}, false) {
      FAIL() << "Incorrect match!";
    }
    with(matcher::any, true) {}
    EXPECT_THAT(_matcher_local, Not(IsUnmatched()));
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, CanMatchMultipleUnlinkedClauses) {
  int hits{0};
  match(ex, b) {
    with(matcher::any, true) {
      ++hits;
    }
    and_with(example{1}, matcher::any) {
      ++hits;
    }
  } else {
    FAIL() << "Unable to construct matcher";
  }
  EXPECT_THAT(hits, Eq(2));
}

TEST_F(CaseMatcherTest, CanMatchAnyOf) {
  match(ex, b) {
    with(matcher::any_of(example{1}, example{0xDEADBEEF}), true) {
    } nomatch() {
      FAIL() << "Unable to match with choice";
    }
    EXPECT_THAT(_matcher_local, Not(IsUnmatched()));
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, WillNotMatchAnyIfNoSubMatches) {
  match(ex, b) {
    with(matcher::any_of(example{0}, example{0xDEADBEEF}), true) {
       FAIL() << "Incorrect match!";
    }
    EXPECT_THAT(_matcher_local, IsUnmatched());
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, CanMatchPredicate) {
  auto lt_5 = [](example e) { return e.i < 5; };
  match(ex, b) {
    with(matcher::matches(lt_5), true) {
    } nomatch() {
      FAIL() << "Unable to match with choice";
    }
    EXPECT_THAT(_matcher_local, Not(IsUnmatched()));
  } else {
    FAIL() << "Unable to construct matcher";
  }
}

TEST_F(CaseMatcherTest, WillNotMatchIfPredicateFails) {
  auto lt_1 = [](example e) { return e.i < 1; };
  match(ex, b) {
    with(matcher::matches(lt_1), true) {
      FAIL() << "Incorrect match!";
    }
    EXPECT_THAT(_matcher_local, IsUnmatched());
  } else {
    FAIL() << "Unable to construct matcher";
  }
}