diff --git a/unittest/formats/test_input_convert.cpp b/unittest/formats/test_input_convert.cpp
index b5ec842e2a..ea7712b36c 100644
--- a/unittest/formats/test_input_convert.cpp
+++ b/unittest/formats/test_input_convert.cpp
@@ -74,29 +74,76 @@ TEST_F(InputConvertTest, logical)
 TEST_F(InputConvertTest, numeric)
 {
     EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "0", false, lmp), 0);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "0.1", false, lmp), 0.1);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "-.232", false, lmp), -0.232);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, ".2e5", false, lmp), 20000.0);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "2.5e-10", false, lmp), 2.5e-10);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "+0.3", false, lmp), 0.3);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "10000000000", false, lmp), 1e10);
+    EXPECT_DOUBLE_EQ(utils::numeric(FLERR, "2.56E+3", false, lmp), 2560);
 
     TEST_FAILURE(".*ERROR: Expected floating point.*", utils::numeric(FLERR, "yay", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected floating point.*", utils::numeric(FLERR, "", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected floating point.*",
+                 utils::numeric(FLERR, nullptr, false, lmp););
+    TEST_FAILURE(".*ERROR: Expected floating point.*",
+                 utils::numeric(FLERR, "2.56D+3", false, lmp););
 }
 
 TEST_F(InputConvertTest, inumeric)
 {
-    EXPECT_DOUBLE_EQ(utils::inumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::inumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::inumeric(FLERR, "-1", false, lmp), -1);
+    EXPECT_EQ(utils::inumeric(FLERR, "10000", false, lmp), 10000);
+    EXPECT_EQ(utils::inumeric(FLERR, "-532410", false, lmp), -532410);
+    EXPECT_EQ(utils::inumeric(FLERR, "-0", false, lmp), 0);
+    EXPECT_EQ(utils::inumeric(FLERR, "0100", false, lmp), 100);
 
     TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "yay", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "0.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "1.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "1e5", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "0x05", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, "", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::inumeric(FLERR, nullptr, false, lmp););
 }
 
 TEST_F(InputConvertTest, bnumeric)
 {
-    EXPECT_DOUBLE_EQ(utils::bnumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::bnumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::bnumeric(FLERR, "-1", false, lmp), -1);
+    EXPECT_EQ(utils::bnumeric(FLERR, "10000", false, lmp), 10000);
+    EXPECT_EQ(utils::bnumeric(FLERR, "-532410", false, lmp), -532410);
+    EXPECT_EQ(utils::bnumeric(FLERR, "-0", false, lmp), 0);
+    EXPECT_EQ(utils::bnumeric(FLERR, "0100", false, lmp), 100);
 
     TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "yay", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "0.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "1.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "1e5", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "0x05", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, "", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::bnumeric(FLERR, nullptr, false, lmp););
 }
+
 TEST_F(InputConvertTest, tnumeric)
 {
-    EXPECT_DOUBLE_EQ(utils::tnumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::tnumeric(FLERR, "0", false, lmp), 0);
+    EXPECT_EQ(utils::tnumeric(FLERR, "-1", false, lmp), -1);
+    EXPECT_EQ(utils::tnumeric(FLERR, "10000", false, lmp), 10000);
+    EXPECT_EQ(utils::tnumeric(FLERR, "-532410", false, lmp), -532410);
+    EXPECT_EQ(utils::tnumeric(FLERR, "-0", false, lmp), 0);
+    EXPECT_EQ(utils::tnumeric(FLERR, "0100", false, lmp), 100);
 
     TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "yay", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "0.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "1.1", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "1e5", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "0x05", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, "", false, lmp););
+    TEST_FAILURE(".*ERROR: Expected integer.*", utils::tnumeric(FLERR, nullptr, false, lmp););
 }
+
 } // namespace LAMMPS_NS
 
 int main(int argc, char **argv)