1 files changed, 49 insertions, 0 deletions
diff --git a/unit-tests/cond-cmp-numeric-ne.mk b/unit-tests/cond-cmp-numeric-ne.mk
new file mode 100755
index 000000000000..6f858584d139
--- /dev/null
+++ b/unit-tests/cond-cmp-numeric-ne.mk
@@ -0,0 +1,49 @@
+# $NetBSD: cond-cmp-numeric-ne.mk,v 1.1 2020/08/23 13:50:17 rillig Exp $
+#
+# Tests for numeric comparisons with the != operator in .if conditions.
+
+# When both sides are equal, the != operator always yields false.
+.if 1 != 1
+.error
+.endif
+
+# This comparison yields the same result, whether numeric or character-based.
+.if 1 != 2
+.else
+.error
+.endif
+
+.if 2 != 1
+.else
+.error
+.endif
+
+# Scientific notation is supported, as per strtod.
+.if 2e7 != 2000e4
+.error
+.endif
+
+.if 2000e4 != 2e7
+.error
+.endif
+
+# Trailing zeroes after the decimal point are irrelevant for the numeric
+# value.
+.if 3.30000 != 3.3
+.error
+.endif
+
+.if 3.3 != 3.30000
+.error
+.endif
+
+# As of 2020-08-23, numeric comparison is implemented as parsing both sides
+# as double, and then performing a normal comparison.  The range of double is
+# typically 16 or 17 significant digits, therefore these two numbers seem to
+# be equal.
+.if 1.000000000000000001 != 1.000000000000000002
+.error
+.endif
+
+all:
+	@:;