diff --git a/tests/expectations/both/constant_big.c b/tests/expectations/both/constant_big.c
index 4829df1..469bf31 100644
--- a/tests/expectations/both/constant_big.c
+++ b/tests/expectations/both/constant_big.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/expectations/both/constant_big.compat.c b/tests/expectations/both/constant_big.compat.c
index 4829df1..469bf31 100644
--- a/tests/expectations/both/constant_big.compat.c
+++ b/tests/expectations/both/constant_big.compat.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/expectations/constant_big.c b/tests/expectations/constant_big.c
index 4829df1..469bf31 100644
--- a/tests/expectations/constant_big.c
+++ b/tests/expectations/constant_big.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/expectations/constant_big.compat.c b/tests/expectations/constant_big.compat.c
index 4829df1..469bf31 100644
--- a/tests/expectations/constant_big.compat.c
+++ b/tests/expectations/constant_big.compat.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/expectations/constant_big.cpp b/tests/expectations/constant_big.cpp
index 9f8d979..e52f8f3 100644
--- a/tests/expectations/constant_big.cpp
+++ b/tests/expectations/constant_big.cpp
@@ -3,6 +3,10 @@
 #include <cstdlib>
 #include <new>
 
-static const uint64_t DOESNT_NEED_ULL_SUFFIX = 8070450532247928832;
+static const int64_t SIGNED_DOESNT_NEED_ULL_SUFFIX = -9223372036854775807;
 
-static const uint64_t NEEDS_ULL_SUFFIX = 9223372036854775808ULL;
+static const int64_t SIGNED_NEEDS_ULL_SUFFIX = -9223372036854775808ULL;
+
+static const uint64_t UNSIGNED_DOESNT_NEED_ULL_SUFFIX = 8070450532247928832;
+
+static const uint64_t UNSIGNED_NEEDS_ULL_SUFFIX = 9223372036854775808ULL;
diff --git a/tests/expectations/tag/constant_big.c b/tests/expectations/tag/constant_big.c
index 4829df1..469bf31 100644
--- a/tests/expectations/tag/constant_big.c
+++ b/tests/expectations/tag/constant_big.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/expectations/tag/constant_big.compat.c b/tests/expectations/tag/constant_big.compat.c
index 4829df1..469bf31 100644
--- a/tests/expectations/tag/constant_big.compat.c
+++ b/tests/expectations/tag/constant_big.compat.c
@@ -3,6 +3,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+#define SIGNED_DOESNT_NEED_ULL_SUFFIX -9223372036854775807
 
-#define NEEDS_ULL_SUFFIX 9223372036854775808ULL
+#define SIGNED_NEEDS_ULL_SUFFIX -9223372036854775808ULL
+
+#define UNSIGNED_DOESNT_NEED_ULL_SUFFIX 8070450532247928832
+
+#define UNSIGNED_NEEDS_ULL_SUFFIX 9223372036854775808ULL
diff --git a/tests/rust/constant_big.rs b/tests/rust/constant_big.rs
index bf25be2..94eb834 100644
--- a/tests/rust/constant_big.rs
+++ b/tests/rust/constant_big.rs
@@ -1,2 +1,8 @@
-pub const NEEDS_ULL_SUFFIX: u64       = 0x8000_0000_0000_0000;
-pub const DOESNT_NEED_ULL_SUFFIX: u64 = 0x7000_0000_0000_0000;
+pub const UNSIGNED_NEEDS_ULL_SUFFIX: u64       = 0x8000_0000_0000_0000;
+pub const UNSIGNED_DOESNT_NEED_ULL_SUFFIX: u64 = 0x7000_0000_0000_0000;
+
+// i64::min_value()
+pub const SIGNED_NEEDS_ULL_SUFFIX: i64         = -9223372036854775808;
+
+// i64::min_value() + 1
+pub const SIGNED_DOESNT_NEED_ULL_SUFFIX: i64   = -9223372036854775807;