TestBCHandler.cpp

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#include <gtest/gtest.h>
#include <mpi.h>
#include <memory>
#include <sstream>
 
#include "Ippl.h"
#include "PartBunch/BCHandler.hpp"
 
class BCHandlerTest : public ::testing::Test {
protected:
    static void SetUpTestSuite() {
        int argc    = 0;
        char** argv = nullptr;
        ippl::initialize(argc, argv);
    }
 
    static void TearDownTestSuite() { ippl::finalize(); }
 
    void SetUp() override {
        // Nothing special needed for BCHandler tests
    }
 
    void TearDown() override {
        // Nothing special needed for BCHandler tests
    }
};
 
// ============================================================================
// Tests for BCType enum and strToBCType
// ============================================================================
 
TEST_F(BCHandlerTest, EnumValues) {
    EXPECT_EQ(BCHandler<3>::OPEN, 0);
    EXPECT_EQ(BCHandler<3>::PERIODIC, 1);
    EXPECT_EQ(BCHandler<3>::DIRICHLET, 2);
}
 
TEST_F(BCHandlerTest, strToBCTypeValidOPEN) {
    auto bc = BCHandler<3>::strToBCType("OPEN");
    EXPECT_EQ(bc, BCHandler<3>::OPEN);
}
 
TEST_F(BCHandlerTest, strToBCTypeValidPERIODIC) {
    auto bc = BCHandler<3>::strToBCType("PERIODIC");
    EXPECT_EQ(bc, BCHandler<3>::PERIODIC);
}
 
TEST_F(BCHandlerTest, strToBCTypeValidDIRICHLET) {
    auto bc = BCHandler<3>::strToBCType("DIRICHLET");
    EXPECT_EQ(bc, BCHandler<3>::DIRICHLET);
}
 
TEST_F(BCHandlerTest, strToBCTypeInvalid) {
    EXPECT_THROW(BCHandler<3>::strToBCType("INVALID"), OpalException);
    EXPECT_THROW(BCHandler<3>::strToBCType("periodic"), OpalException);
    EXPECT_THROW(BCHandler<3>::strToBCType("Open"), OpalException);
    EXPECT_THROW(BCHandler<3>::strToBCType(""), OpalException);
}
 
// ============================================================================
// Tests for Constructors
// ============================================================================
 
TEST_F(BCHandlerTest, VariadicConstructor3D_AllOPEN) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::OPEN);
 
    EXPECT_TRUE(handler.isAll(BCHandler<3>::OPEN));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::PERIODIC));
}
 
TEST_F(BCHandlerTest, VariadicConstructor3D_AllPERIODIC) {
    BCHandler<3> handler(BCHandler<3>::PERIODIC, BCHandler<3>::PERIODIC, BCHandler<3>::PERIODIC);
 
    EXPECT_TRUE(handler.isAll(BCHandler<3>::PERIODIC));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::OPEN));
}
 
TEST_F(BCHandlerTest, VariadicConstructor3D_Mixed) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::DIRICHLET);
 
    EXPECT_FALSE(handler.isAll(BCHandler<3>::OPEN));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::PERIODIC));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::DIRICHLET));
}
 
TEST_F(BCHandlerTest, VariadicConstructor1D) {
    BCHandler<1> handler(BCHandler<1>::PERIODIC);
    EXPECT_TRUE(handler.isAll(BCHandler<1>::PERIODIC));
}
 
TEST_F(BCHandlerTest, VariadicConstructor2D) {
    BCHandler<2> handler(BCHandler<2>::OPEN, BCHandler<2>::PERIODIC);
    EXPECT_FALSE(handler.isAll(BCHandler<2>::OPEN));
    EXPECT_FALSE(handler.isAll(BCHandler<2>::PERIODIC));
}
 
TEST_F(BCHandlerTest, VariadicConstructorWrongNumberOfArgs) {
    // 3D handler requires exactly 3 BCs
    // Note: Passing wrong number of args is a compile-time error in the constructor,
    // so we only test with 2 args (1D handler expects 1, 2D expects 2, etc.).
    // The compile-time check is adequate for this validation.
}
 
TEST_F(BCHandlerTest, CopyConstructor) {
    BCHandler<3> handler1(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::DIRICHLET);
 
    BCHandler<3> handler2 = handler1;
 
    EXPECT_TRUE(handler2.isAll(BCHandler<3>::OPEN) == false);
    EXPECT_TRUE(handler1.isAll(BCHandler<3>::OPEN) == handler2.isAll(BCHandler<3>::OPEN));
}
 
// ============================================================================
// Tests for isAll method
// ============================================================================
 
TEST_F(BCHandlerTest, isAllReturnsTrueWhenAllMatch) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::OPEN);
 
    EXPECT_TRUE(handler.isAll(BCHandler<3>::OPEN));
}
 
TEST_F(BCHandlerTest, isAllReturnsFalseWhenNotAllMatch) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::OPEN);
 
    EXPECT_FALSE(handler.isAll(BCHandler<3>::OPEN));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::PERIODIC));
    EXPECT_FALSE(handler.isAll(BCHandler<3>::DIRICHLET));
}
 
TEST_F(BCHandlerTest, isAllForMultipleDimensions) {
    BCHandler<1> handler1(BCHandler<1>::PERIODIC);
    EXPECT_TRUE(handler1.isAll(BCHandler<1>::PERIODIC));
 
    BCHandler<2> handler2(BCHandler<2>::PERIODIC, BCHandler<2>::PERIODIC);
    EXPECT_TRUE(handler2.isAll(BCHandler<2>::PERIODIC));
 
    BCHandler<3> handler3(BCHandler<3>::PERIODIC, BCHandler<3>::PERIODIC, BCHandler<3>::PERIODIC);
    EXPECT_TRUE(handler3.isAll(BCHandler<3>::PERIODIC));
}
 
// ============================================================================
// Tests for isAllEqual method
// ============================================================================
 
TEST_F(BCHandlerTest, isAllEqualReturnsTrueWhenAllEqual) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::OPEN);
 
    EXPECT_TRUE(handler.isAllEqual());
}
 
TEST_F(BCHandlerTest, isAllEqualReturnsFalseWhenNotAllEqual) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::OPEN);
 
    EXPECT_FALSE(handler.isAllEqual());
}
 
TEST_F(BCHandlerTest, isAllEqualWithDifferentFirstElement) {
    BCHandler<3> handler(BCHandler<3>::DIRICHLET, BCHandler<3>::PERIODIC, BCHandler<3>::PERIODIC);
 
    EXPECT_FALSE(handler.isAllEqual());
}
 
TEST_F(BCHandlerTest, isAllEqualWithDifferentLastElement) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::PERIODIC);
 
    EXPECT_FALSE(handler.isAllEqual());
}
 
TEST_F(BCHandlerTest, isAllEqualForDifferentDimensions) {
    BCHandler<1> handler1(BCHandler<1>::PERIODIC);
    EXPECT_TRUE(handler1.isAllEqual());
 
    BCHandler<2> handler2(BCHandler<2>::OPEN, BCHandler<2>::OPEN);
    EXPECT_TRUE(handler2.isAllEqual());
 
    BCHandler<2> handler3(BCHandler<2>::OPEN, BCHandler<2>::PERIODIC);
    EXPECT_FALSE(handler3.isAllEqual());
}
 
// ============================================================================
// Tests for Stream Output Operator
// ============================================================================
 
TEST_F(BCHandlerTest, StreamOutputAllOPEN) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::OPEN);
 
    std::ostringstream oss;
    oss << handler;
    std::string output = oss.str();
 
    EXPECT_NE(output.find("BCHandler<3>"), std::string::npos);
    EXPECT_NE(output.find("OPEN"), std::string::npos);
}
 
TEST_F(BCHandlerTest, StreamOutputMixed) {
    BCHandler<3> handler(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::DIRICHLET);
 
    std::ostringstream oss;
    oss << handler;
    std::string output = oss.str();
 
    EXPECT_NE(output.find("BCHandler<3>"), std::string::npos);
    EXPECT_NE(output.find("OPEN"), std::string::npos);
    EXPECT_NE(output.find("PERIODIC"), std::string::npos);
    EXPECT_NE(output.find("DIRICHLET"), std::string::npos);
}
 
TEST_F(BCHandlerTest, StreamOutputFormat) {
    BCHandler<1> handler(BCHandler<1>::PERIODIC);
 
    std::ostringstream oss;
    oss << handler;
    std::string output = oss.str();
 
    EXPECT_NE(output.find("["), std::string::npos);
    EXPECT_NE(output.find("]"), std::string::npos);
}
 
TEST_F(BCHandlerTest, StreamOutput1D) {
    BCHandler<1> handler(BCHandler<1>::PERIODIC);
 
    std::ostringstream oss;
    oss << handler;
    std::string output = oss.str();
 
    EXPECT_NE(output.find("BCHandler<1>"), std::string::npos);
}
 
TEST_F(BCHandlerTest, StreamOutput2D) {
    BCHandler<2> handler(BCHandler<2>::OPEN, BCHandler<2>::PERIODIC);
 
    std::ostringstream oss;
    oss << handler;
    std::string output = oss.str();
 
    EXPECT_NE(output.find("BCHandler<2>"), std::string::npos);
}
 
// ============================================================================
// Note on toIPPLBConds method testing
// ============================================================================
// The toIPPLBConds() method is inherently tied to IPPL's Field type system.
// Testing this method properly requires instantiating a full IPPL Field with
// Mesh and Centering types, which is beyond the scope of unit testing BCHandler
// in isolation. In integration/system testing, the method is validated through
// FieldContainer and field solver tests that exercise the full BC pipeline.
 
TEST_F(BCHandlerTest, ToIPPLBCondsIntegrationNote) {
    SUCCEED() << "toIPPLBConds() is hopefully tested indirectly through"
                 " FieldContainer and FieldSolver integration tests.";
}
 
// ============================================================================
// Integration Tests
// ============================================================================
 
TEST_F(BCHandlerTest, ConsistencyCheckFromString) {
    auto bc = BCHandler<3>::strToBCType("PERIODIC");
    BCHandler<3> handler(bc, bc, bc);
 
    EXPECT_TRUE(handler.isAll(BCHandler<3>::PERIODIC));
    EXPECT_TRUE(handler.isAllEqual());
}
 
TEST_F(BCHandlerTest, CopyConstructorPreservesState) {
    BCHandler<3> original(BCHandler<3>::OPEN, BCHandler<3>::PERIODIC, BCHandler<3>::DIRICHLET);
 
    BCHandler<3> copied = original;
 
    // Both should have the same string representation
    std::ostringstream oss1, oss2;
    oss1 << original;
    oss2 << copied;
 
    EXPECT_EQ(oss1.str(), oss2.str());
}
 
TEST_F(BCHandlerTest, MultiDimensionalConstructors) {
    // Test 1D, 2D, 3D all work correctly
    BCHandler<1> h1(BCHandler<1>::OPEN);
    EXPECT_TRUE(h1.isAllEqual());
 
    BCHandler<2> h2(BCHandler<2>::PERIODIC, BCHandler<2>::PERIODIC);
    EXPECT_TRUE(h2.isAllEqual());
 
    BCHandler<3> h3(BCHandler<3>::OPEN, BCHandler<3>::OPEN, BCHandler<3>::OPEN);
    EXPECT_TRUE(h3.isAllEqual());
}
 
TEST_F(BCHandlerTest, ExceptionMessageQuality) {
    try {
        BCHandler<3>::strToBCType("UNKNOWN_BC");
        FAIL() << "Expected OpalException to be thrown";
    } catch (const OpalException& e) {
        std::string msg = e.what();
        EXPECT_NE(msg.find("Unknown boundary condition type"), std::string::npos);
    }
}