Move 'builtins' test of src/gie.c to test/unit/gie_self_tests.cpp

3 files changed, 580 insertions, 6 deletions

diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index 5138dafc..8a25d7a3 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -103,3 +103,11 @@ target_link_libraries(proj_test_cpp_api
   ${PROJ_LIBRARIES}
   ${SQLITE3_LIBRARY})
 add_test(NAME proj_test_cpp_api COMMAND proj_test_cpp_api)
+
+add_executable(gie_self_tests
+  main.cpp
+  gie_self_tests.cpp)
+target_link_libraries(gie_self_tests
+  gtest
+  ${PROJ_LIBRARIES})
+add_test(NAME gie_self_tests COMMAND gie_self_tests)
diff --git a/test/unit/Makefile.am b/test/unit/Makefile.am
index 77525f9a..913a3f29 100644
--- a/test/unit/Makefile.am
+++ b/test/unit/Makefile.am
@@ -13,13 +13,11 @@ noinst_PROGRAMS = basic_test
 noinst_PROGRAMS += pj_phi2_test
 noinst_PROGRAMS += proj_errno_string_test
 noinst_PROGRAMS += test_cpp_api
+noinst_PROGRAMS += gie_self_tests
 
 basic_test_SOURCES = basic_test.cpp main.cpp
 basic_test_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la
 
-test_cpp_api_SOURCES = test_util.cpp test_common.cpp test_crs.cpp test_metadata.cpp test_io.cpp test_operation.cpp test_datum.cpp test_factory.cpp test_c_api.cpp main.cpp
-test_cpp_api_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la @SQLITE3_LDFLAGS@
-
 basic_test-check: basic_test
 	./basic_test
 
@@ -35,10 +33,16 @@ proj_errno_string_test_LDADD= ../../src/libproj.la ../../test/googletest/libgtes
 proj_errno_string_test-check: proj_errno_string_test
 	./proj_errno_string_test
 
-check-local: basic_test-check
-check-local: pj_phi2_test-check proj_errno_string_test-check
+test_cpp_api_SOURCES = test_util.cpp test_common.cpp test_crs.cpp test_metadata.cpp test_io.cpp test_operation.cpp test_datum.cpp test_factory.cpp test_c_api.cpp main.cpp
+test_cpp_api_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la @SQLITE3_LDFLAGS@
 
 test_cpp_api-check: test_cpp_api
 	PROJ_LIB=$(PROJ_LIB) ./test_cpp_api
 
-check-local: basic_test-check test_cpp_api-check
+gie_self_tests_SOURCES = gie_self_tests.cpp main.cpp
+gie_self_tests_LDADD = ../../src/libproj.la ../../test/googletest/libgtest.la @SQLITE3_LDFLAGS@
+
+gie_self_tests-check: gie_self_tests
+	PROJ_LIB=$(PROJ_LIB) ./gie_self_tests
+
+check-local: basic_test-check pj_phi2_test-check proj_errno_string_test-check test_cpp_api-check gie_self_tests-check
diff --git a/test/unit/gie_self_tests.cpp b/test/unit/gie_self_tests.cpp
new file mode 100644
index 00000000..67a44fe5
--- /dev/null
+++ b/test/unit/gie_self_tests.cpp
@@ -0,0 +1,562 @@
+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  Test
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2017, Thomas Knudsen
+ * Copyright (c) 2017, SDFE
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#include "gtest_include.h"
+
+// PROJ include order is sensitive
+// clang-format off
+#include "proj_internal.h"
+#include "proj.h"
+#include "projects.h"
+// clang-format on
+
+#include <cmath>
+#include <string>
+
+namespace {
+
+// ---------------------------------------------------------------------------
+
+TEST( gie, cart_selftest ) {
+    PJ_CONTEXT *ctx;
+    PJ *P;
+    PJ_COORD a, b, obs[2];
+    PJ_COORD coord[2];
+
+    PJ_INFO info;
+    PJ_PROJ_INFO pj_info;
+    PJ_GRID_INFO grid_info;
+    PJ_INIT_INFO init_info;
+
+    PJ_FACTORS factors;
+
+    const PJ_OPERATIONS *oper_list;
+    const PJ_ELLPS *ellps_list;
+    const PJ_UNITS *unit_list;
+    const PJ_PRIME_MERIDIANS *pm_list;
+
+    int err;
+    size_t n, sz;
+    double dist, h, t;
+    const char * const args[3] = {"proj=utm", "zone=32", "ellps=GRS80"};
+    char arg[50] = {"+proj=utm; +zone=32; +ellps=GRS80"};
+    char buf[40];
+
+    /* An utm projection on the GRS80 ellipsoid */
+    P = proj_create (PJ_DEFAULT_CTX, arg);
+    ASSERT_TRUE( P != nullptr );
+
+    /* Clean up */
+    proj_destroy (P);
+
+    /* Same projection, now using argc/argv style initialization */
+    P = proj_create_argv (PJ_DEFAULT_CTX, 3, const_cast<char**>(args));
+    ASSERT_TRUE( P != nullptr );
+
+    /* zero initialize everything, then set (longitude, latitude) to (12, 55) */
+    a = proj_coord (0,0,0,0);
+    /* a.lp: The coordinate part of a, interpreted as a classic LP pair */
+    a.lp.lam = proj_torad(12);
+    a.lp.phi = proj_torad(55);
+
+    /* Forward projection */
+    b = proj_trans (P, PJ_FWD, a);
+
+    /* Inverse projection */
+    a = proj_trans (P, PJ_INV, b);
+
+    /* Null projection */
+    a = proj_trans (P, PJ_IDENT, a);
+
+    /* Forward again, to get two linear items for comparison */
+    a = proj_trans (P, PJ_FWD, a);
+
+    dist = proj_xy_dist (a, b);
+    ASSERT_LE(dist, 2e-9);
+
+    /* Clear any previous error */
+    proj_errno_reset (P);
+
+    /* Invalid projection */
+    a = proj_trans (P, static_cast<PJ_DIRECTION>(42), a);
+    ASSERT_EQ(a.lpz.lam, HUGE_VAL);
+
+    err = proj_errno (P);
+    ASSERT_NE(err, 0);
+
+    /* Clear error again */
+    proj_errno_reset (P);
+
+    /* Clean up */
+    proj_destroy (P);
+
+    /* Now do some 3D transformations */
+    P = proj_create (PJ_DEFAULT_CTX, "+proj=cart +ellps=GRS80");
+    ASSERT_TRUE( P != nullptr );
+
+    /* zero initialize everything, then set (longitude, latitude, height) to (12, 55, 100) */
+    a = b = proj_coord (0,0,0,0);
+    a.lpz.lam = proj_torad(12);
+    a.lpz.phi = proj_torad(55);
+    a.lpz.z   = 100;
+
+    /* Forward projection: 3D-Cartesian-to-Ellipsoidal */
+    b = proj_trans (P, PJ_FWD, a);
+
+    /* Check roundtrip precision for 10000 iterations each way */
+    dist  = proj_roundtrip (P, PJ_FWD, 10000, &a);
+    dist += proj_roundtrip (P, PJ_INV, 10000, &b);
+    ASSERT_LE(dist, 4e-9);
+
+
+    /* Test at the North Pole */
+    a = b = proj_coord (0,0,0,0);
+    a.lpz.lam = proj_torad(0);
+    a.lpz.phi = proj_torad(90);
+    a.lpz.z   = 100;
+
+    /* Forward projection: Ellipsoidal-to-3D-Cartesian */
+    dist = proj_roundtrip (P, PJ_FWD, 1, &a);
+    ASSERT_LE(dist, 1e-9);
+
+    /* Test at the South Pole */
+    a = b = proj_coord (0,0,0,0);
+    a.lpz.lam = proj_torad(0);
+    a.lpz.phi = proj_torad(-90);
+    a.lpz.z   = 100;
+    b = a;
+
+    /* Forward projection: Ellipsoidal-to-3D-Cartesian */
+    dist = proj_roundtrip (P, PJ_FWD, 1, &a);
+    ASSERT_LE(dist, 4e-9);
+
+    /* Inverse projection: 3D-Cartesian-to-Ellipsoidal */
+    b = proj_trans (P, PJ_INV, b);
+
+    /* Move p to another context */
+    ctx = proj_context_create ();
+    ASSERT_NE (ctx, pj_get_default_ctx());
+
+    proj_context_set (P, ctx);
+    ASSERT_EQ (ctx, P->ctx);
+
+    b = proj_trans (P, PJ_FWD, b);
+
+    /* Move it back to the default context */
+    proj_context_set (P, 0);
+    ASSERT_EQ (pj_get_default_ctx(), P->ctx);
+
+    proj_context_destroy (ctx);
+
+    /* We go on with the work - now back on the default context */
+    b = proj_trans (P, PJ_INV, b);
+    proj_destroy (P);
+
+
+    /* Testing proj_trans_generic () */
+
+    /* An utm projection on the GRS80 ellipsoid */
+    P = proj_create (PJ_DEFAULT_CTX, "+proj=utm +zone=32 +ellps=GRS80");
+    ASSERT_TRUE( P != nullptr );
+
+    obs[0] = proj_coord (proj_torad(12), proj_torad(55), 45, 0);
+    obs[1] = proj_coord (proj_torad(12), proj_torad(56), 50, 0);
+    sz = sizeof (PJ_COORD);
+
+    /* Forward projection */
+    a = proj_trans (P, PJ_FWD, obs[0]);
+    b = proj_trans (P, PJ_FWD, obs[1]);
+
+    n = proj_trans_generic (
+        P, PJ_FWD,
+        &(obs[0].lpz.lam), sz, 2,
+        &(obs[0].lpz.phi), sz, 2,
+        &(obs[0].lpz.z),   sz, 2,
+        0,                     sz, 0
+    );
+    ASSERT_EQ(n, 2);
+
+    ASSERT_EQ (a.lpz.lam , obs[0].lpz.lam);
+    ASSERT_EQ (a.lpz.phi , obs[0].lpz.phi);
+    ASSERT_EQ (a.lpz.z   , obs[0].lpz.z);
+    ASSERT_EQ (b.lpz.lam , obs[1].lpz.lam);
+    ASSERT_EQ (b.lpz.phi , obs[1].lpz.phi);
+    ASSERT_EQ (b.lpz.z   , obs[1].lpz.z);
+
+    /* now test the case of constant z */
+    obs[0] = proj_coord (proj_torad(12), proj_torad(55), 45, 0);
+    obs[1] = proj_coord (proj_torad(12), proj_torad(56), 50, 0);
+    h = 27;
+    t = 33;
+    n = proj_trans_generic (
+        P, PJ_FWD,
+        &(obs[0].lpz.lam), sz, 2,
+        &(obs[0].lpz.phi), sz, 2,
+        &h,                     0, 1,
+        &t,                     0, 1
+    );
+    ASSERT_EQ(n, 2);
+
+    ASSERT_EQ (a.lpz.lam , obs[0].lpz.lam);
+    ASSERT_EQ (a.lpz.phi , obs[0].lpz.phi);
+    ASSERT_EQ (45, obs[0].lpz.z);
+    ASSERT_EQ (b.lpz.lam, obs[1].lpz.lam);
+    ASSERT_EQ (b.lpz.phi, obs[1].lpz.phi);
+    ASSERT_EQ (50, obs[1].lpz.z);
+    ASSERT_NE (50, h);
+
+    /* test proj_trans_array () */
+
+    coord[0] = proj_coord (proj_torad(12), proj_torad(55), 45, 0);
+    coord[1] = proj_coord (proj_torad(12), proj_torad(56), 50, 0);
+    ASSERT_FALSE (proj_trans_array (P, PJ_FWD, 2, coord));
+
+    ASSERT_EQ (a.lpz.lam , coord[0].lpz.lam);
+    ASSERT_EQ (a.lpz.phi , coord[0].lpz.phi);
+    ASSERT_EQ (a.lpz.z   , coord[0].lpz.z);
+    ASSERT_EQ (b.lpz.lam , coord[1].lpz.lam);
+    ASSERT_EQ (b.lpz.phi , coord[1].lpz.phi);
+    ASSERT_EQ (b.lpz.z   , coord[1].lpz.z);
+
+    /* Clean up  after proj_trans_* tests */
+    proj_destroy (P);
+
+    /* test proj_create_crs_to_crs() */
+    P = proj_create_crs_to_crs(PJ_DEFAULT_CTX, "epsg:25832", "epsg:25833", NULL);
+    ASSERT_TRUE( P != nullptr );
+
+    a.xy.x =  700000.0;
+    a.xy.y = 6000000.0;
+    b.xy.x =  307788.8761171057;
+    b.xy.y = 5999669.3036037628;
+
+    a = proj_trans(P, PJ_FWD, a);
+    ASSERT_LE(dist, 1e-7);
+    proj_destroy(P);
+
+    /* let's make sure that only entries in init-files results in a usable PJ */
+    P = proj_create_crs_to_crs(PJ_DEFAULT_CTX, "proj=utm +zone=32 +datum=WGS84", "proj=utm +zone=33 +datum=WGS84", NULL);
+    ASSERT_TRUE( P == nullptr );
+    proj_destroy(P);
+
+    /* ********************************************************************** */
+    /*                          Test info functions                           */
+    /* ********************************************************************** */
+
+    /* proj_info()                                                            */
+    /* this one is difficult to test, since the output changes with the setup */
+    info = proj_info();
+
+    if (info.version[0] != '\0' ) {
+        char tmpstr[64];
+        sprintf(tmpstr, "%d.%d.%d", info.major, info.minor, info.patch);
+        ASSERT_EQ( std::string(info.version), std::string(tmpstr) );
+    }
+    ASSERT_NE( std::string(info.release), "" );
+    if (getenv ("HOME") || getenv ("PROJ_LIB")) {
+        ASSERT_NE( std::string(info.searchpath), std::string() );
+    }
+
+    /* proj_pj_info() */
+    {
+        P = proj_create(PJ_DEFAULT_CTX, "+proj=august"); /* august has no inverse */
+        auto has_inverse = proj_pj_info(P).has_inverse;
+        proj_destroy(P);
+        ASSERT_FALSE(has_inverse);
+    }
+
+    P = proj_create(PJ_DEFAULT_CTX, arg);
+    pj_info = proj_pj_info(P);
+    ASSERT_TRUE( pj_info.has_inverse );
+    pj_shrink (arg);
+    ASSERT_EQ( std::string(pj_info.definition), arg );
+    ASSERT_EQ( std::string(pj_info.id), "utm" );
+
+    proj_destroy(P);
+
+    /* proj_grid_info() */
+    grid_info = proj_grid_info("null");
+    ASSERT_NE( std::string(grid_info.filename), "" );
+    ASSERT_EQ( std::string(grid_info.gridname), "null" );
+
+    grid_info = proj_grid_info("nonexistinggrid");
+    ASSERT_EQ( std::string(grid_info.filename), "" );
+
+    /* proj_init_info() */
+    init_info = proj_init_info("unknowninit");
+    ASSERT_EQ( std::string(init_info.filename), "" );
+
+    init_info = proj_init_info("epsg");
+    /* Need to allow for "Unknown" until all commonly distributed EPSG-files comes with a metadata section */
+    ASSERT_TRUE( std::string(init_info.origin) == "EPSG" || std::string(init_info.origin) == "Unknown" ) << std::string(init_info.origin);
+    ASSERT_EQ( std::string(init_info.name), "epsg" );
+
+
+    /* test proj_rtodms() and proj_dmstor() */
+    ASSERT_EQ( std::string("180dN"), proj_rtodms(buf, M_PI, 'N', 'S'));
+
+    ASSERT_EQ(proj_dmstor(&buf[0], NULL), M_PI);
+
+    ASSERT_EQ( std::string("114d35'29.612\"S"), proj_rtodms(buf, -2.0, 'N', 'S'));
+
+    /* we can't expect perfect numerical accuracy so testing with a tolerance */
+    ASSERT_NEAR (-2.0 , proj_dmstor(&buf[0], NULL) , 1e-7);
+
+    /* test proj_derivatives_retrieve() and proj_factors_retrieve() */
+    P = proj_create(PJ_DEFAULT_CTX, "+proj=merc");
+    a = proj_coord (0,0,0,0);
+    a.lp.lam = proj_torad(12);
+    a.lp.phi = proj_torad(55);
+
+    factors = proj_factors(P, a);
+    ASSERT_FALSE (proj_errno(P)); /* factors not created correctly */
+
+    /* check a few key characteristics of the Mercator projection */
+    ASSERT_EQ (factors.angular_distortion, 0.0); /* angular distortion should be 0 */
+    ASSERT_EQ (factors.meridian_parallel_angle, M_PI_2); /* Meridian/parallel angle should be 90 deg */
+    ASSERT_EQ (factors.meridian_convergence, 0.0); /* meridian convergence should be 0 */
+
+    proj_destroy(P);
+
+    /* Check that proj_list_* functions work by looping through them */
+    n = 0;
+    for (oper_list = proj_list_operations(); oper_list->id; ++oper_list) n++;
+    ASSERT_NE(n, 0U);
+
+    n = 0;
+    for (ellps_list = proj_list_ellps(); ellps_list->id; ++ellps_list) n++;
+    ASSERT_NE(n, 0U);
+
+    n = 0;
+    for (unit_list = proj_list_units(); unit_list->id; ++unit_list) n++;
+    ASSERT_NE(n, 0U);
+
+    n = 0;
+    for (pm_list = proj_list_prime_meridians(); pm_list->id; ++pm_list) n++;
+    ASSERT_NE(n, 0U);
+
+
+    /* check io-predicates */
+
+    /* angular in on fwd, linear out */
+    P = proj_create (PJ_DEFAULT_CTX, "+proj=cart +ellps=GRS80");
+    ASSERT_TRUE( P != nullptr );
+    ASSERT_TRUE(proj_angular_input (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_input (P, PJ_INV));
+    ASSERT_FALSE(proj_angular_output (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_output (P, PJ_INV));
+    P->inverted = 1;
+    ASSERT_FALSE(proj_angular_input (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_input (P, PJ_INV));
+    ASSERT_TRUE(proj_angular_output (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_output (P, PJ_INV));
+    proj_destroy(P);
+
+    /* angular in and out */
+    P = proj_create(PJ_DEFAULT_CTX,
+        "+proj=molodensky +a=6378160 +rf=298.25 "
+        "+da=-23 +df=-8.120449e-8 +dx=-134 +dy=-48 +dz=149 "
+        "+abridged "
+    );
+    ASSERT_TRUE( P != nullptr );
+    ASSERT_TRUE(proj_angular_input (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_input (P, PJ_INV));
+    ASSERT_TRUE(proj_angular_output (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_output (P, PJ_INV));
+    P->inverted = 1;
+    ASSERT_TRUE(proj_angular_input (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_input (P, PJ_INV));
+    ASSERT_TRUE(proj_angular_output (P, PJ_FWD));
+    ASSERT_TRUE(proj_angular_output (P, PJ_INV));
+    proj_destroy(P);
+
+    /* linear in and out */
+    P = proj_create(PJ_DEFAULT_CTX,
+        " +proj=helmert"
+        " +x=0.0127 +y=0.0065 +z=-0.0209 +s=0.00195"
+        " +rx=-0.00039 +ry=0.00080 +rz=-0.00114"
+        " +dx=-0.0029 +dy=-0.0002 +dz=-0.0006 +ds=0.00001"
+        " +drx=-0.00011 +dry=-0.00019 +drz=0.00007"
+        " +t_epoch=1988.0 +convention=coordinate_frame +no_defs"
+    );
+    ASSERT_TRUE( P != nullptr );
+    ASSERT_FALSE(proj_angular_input (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_input (P, PJ_INV));
+    ASSERT_FALSE(proj_angular_output (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_output (P, PJ_INV));
+    P->inverted = 1;
+    ASSERT_FALSE(proj_angular_input (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_input (P, PJ_INV));
+    ASSERT_FALSE(proj_angular_output (P, PJ_FWD));
+    ASSERT_FALSE(proj_angular_output (P, PJ_INV));
+
+    /* We specified "no_defs" but didn't give any ellipsoid info */
+    /* pj_init_ctx should default to WGS84 */
+    ASSERT_EQ (P->a, 6378137.0);
+    ASSERT_EQ (P->f, 1.0/298.257223563);
+    proj_destroy(P);
+
+    /* Test that pj_fwd* and pj_inv* returns NaNs when receiving NaN input */
+    P = proj_create(PJ_DEFAULT_CTX, "+proj=merc");
+    ASSERT_TRUE( P != nullptr );
+    a = proj_coord(NAN, NAN, NAN, NAN);
+    a = proj_trans(P, PJ_FWD, a);
+    ASSERT_TRUE ( ( std::isnan(a.v[0]) && std::isnan(a.v[1]) && std::isnan(a.v[2]) && std::isnan(a.v[3]) ) );
+
+    a = proj_coord(NAN, NAN, NAN, NAN);
+    a = proj_trans(P, PJ_INV, a);
+    ASSERT_TRUE ( ( std::isnan(a.v[0]) && std::isnan(a.v[1]) && std::isnan(a.v[2]) && std::isnan(a.v[3]) ) );
+    proj_destroy(P);
+
+}
+
+// ---------------------------------------------------------------------------
+
+static void test_time(const char* args, double tol, double t_in, double t_exp) {
+    PJ_COORD in, out;
+    PJ *P = proj_create(PJ_DEFAULT_CTX, args);
+
+    ASSERT_TRUE(P != 0);
+
+    in = proj_coord(0.0, 0.0, 0.0, t_in);
+
+    out = proj_trans(P, PJ_FWD, in);
+    EXPECT_NEAR(out.xyzt.t, t_exp, tol);
+
+    out = proj_trans(P, PJ_INV, out);
+    EXPECT_NEAR(out.xyzt.t, t_in, tol);
+
+    pj_free(P);
+
+    proj_log_level(NULL, PJ_LOG_NONE);
+}
+
+// ---------------------------------------------------------------------------
+
+TEST( gie, unitconvert_selftest ) {
+
+    char args1[] = "+proj=unitconvert +t_in=decimalyear +t_out=decimalyear";
+    double in1 = 2004.25;
+
+    char args2[] = "+proj=unitconvert +t_in=gps_week +t_out=gps_week";
+    double in2 = 1782.0;
+
+    char args3[] = "+proj=unitconvert +t_in=mjd +t_out=mjd";
+    double in3 = 57390.0;
+
+    char args4[] = "+proj=unitconvert +t_in=gps_week +t_out=decimalyear";
+    double in4 = 1877.71428, exp4 = 2016.0;
+
+    char args5[] = "+proj=unitconvert +t_in=yyyymmdd +t_out=yyyymmdd";
+    double in5 = 20170131;
+
+    test_time(args1, 1e-6, in1, in1);
+    test_time(args2, 1e-6, in2, in2);
+    test_time(args3, 1e-6, in3, in3);
+    test_time(args4, 1e-6, in4, exp4);
+    test_time(args5, 1e-6, in5, in5);
+}
+
+
+static const char tc32_utm32[] = {
+    " +proj=horner"
+    " +ellps=intl"
+    " +range=500000"
+    " +fwd_origin=877605.269066,6125810.306769"
+    " +inv_origin=877605.760036,6125811.281773"
+    " +deg=4"
+    " +fwd_v=6.1258112678e+06,9.9999971567e-01,1.5372750011e-10,5.9300860915e-15,2.2609497633e-19,4.3188227445e-05,2.8225130416e-10,7.8740007114e-16,-1.7453997279e-19,1.6877465415e-10,-1.1234649773e-14,-1.7042333358e-18,-7.9303467953e-15,-5.2906832535e-19,3.9984284847e-19"
+    " +fwd_u=8.7760574982e+05,9.9999752475e-01,2.8817299305e-10,5.5641310680e-15,-1.5544700949e-18,-4.1357045890e-05,4.2106213519e-11,2.8525551629e-14,-1.9107771273e-18,3.3615590093e-10,2.4380247154e-14,-2.0241230315e-18,1.2429019719e-15,5.3886155968e-19,-1.0167505000e-18"
+    " +inv_v=6.1258103208e+06,1.0000002826e+00,-1.5372762184e-10,-5.9304261011e-15,-2.2612705361e-19,-4.3188331419e-05,-2.8225549995e-10,-7.8529116371e-16,1.7476576773e-19,-1.6875687989e-10,1.1236475299e-14,1.7042518057e-18,7.9300735257e-15,5.2881862699e-19,-3.9990736798e-19"
+    " +inv_u=8.7760527928e+05,1.0000024735e+00,-2.8817540032e-10,-5.5627059451e-15,1.5543637570e-18,4.1357152105e-05,-4.2114813612e-11,-2.8523713454e-14,1.9109017837e-18,-3.3616407783e-10,-2.4382678126e-14,2.0245020199e-18,-1.2441377565e-15,-5.3885232238e-19,1.0167203661e-18"
+};
+
+static const char sb_utm32[] = {
+    " +proj=horner"
+    " +ellps=intl"
+    " +range=500000"
+    " +tolerance=0.0005"
+    " +fwd_origin=4.94690026817276e+05,6.13342113183056e+06"
+    " +inv_origin=6.19480258923588e+05,6.13258568148837e+06"
+    " +deg=3"
+    " +fwd_c=6.13258562111350e+06,6.19480105709997e+05,9.99378966275206e-01,-2.82153291753490e-02,-2.27089979140026e-10,-1.77019590701470e-09,1.08522286274070e-14,2.11430298751604e-15"
+    " +inv_c=6.13342118787027e+06,4.94690181709311e+05,9.99824464710368e-01,2.82279070814774e-02,7.66123542220864e-11,1.78425334628927e-09,-1.05584823306400e-14,-3.32554258683744e-15"
+};
+
+// ---------------------------------------------------------------------------
+
+TEST( gie, horner_selftest ) {
+
+    PJ *P;
+    PJ_COORD a, b, c;
+    double dist;
+
+    /* Real polynonia relating the technical coordinate system TC32 to "System 45 Bornholm" */
+    P = proj_create (PJ_DEFAULT_CTX, tc32_utm32);
+    ASSERT_TRUE( P != nullptr );
+
+    a = b = proj_coord (0,0,0,0);
+    a.uv.v = 6125305.4245;
+    a.uv.u =  878354.8539;
+    c = a;
+
+    /* Check roundtrip precision for 1 iteration each way, starting in forward direction */
+    dist = proj_roundtrip (P, PJ_FWD, 1, &c);
+    EXPECT_LE( dist, 0.01 );
+    proj_destroy(P);
+
+    /* The complex polynomial transformation between the "System Storebaelt" and utm32/ed50 */
+    P = proj_create (PJ_DEFAULT_CTX, sb_utm32);
+    ASSERT_TRUE( P != nullptr );
+
+    /* Test value: utm32_ed50(620000, 6130000) = sb_ed50(495136.8544, 6130821.2945) */
+    a = b = c = proj_coord (0,0,0,0);
+    a.uv.v = 6130821.2945;
+    a.uv.u =  495136.8544;
+    c.uv.v = 6130000.0000;
+    c.uv.u =  620000.0000;
+
+    /* Forward projection */
+    b = proj_trans (P, PJ_FWD, a);
+    dist = proj_xy_dist (b, c);
+    EXPECT_LE( dist, 0.001 );
+
+    /* Inverse projection */
+    b = proj_trans (P, PJ_INV, c);
+    dist = proj_xy_dist (b, a);
+    EXPECT_LE( dist, 0.001 );
+
+    /* Check roundtrip precision for 1 iteration each way */
+    dist = proj_roundtrip (P, PJ_FWD, 1, &a);
+    EXPECT_LE( dist, 0.01 );
+
+    proj_destroy(P);
+}
+
+} // namespace