diff --git a/test/run_tests.cpp b/test/run_tests.cpp
index 214881f74..8806f2333 100644
--- a/test/run_tests.cpp
+++ b/test/run_tests.cpp
@@ -439,10 +439,74 @@ extern {
 }
 
 export fn main(argc : isize, argv : &&u8, env : &&u8) -> i32 {
-    printf(c"0=%d\n", 0 as i32); // TODO: more tests
+    printf(c"\n");
+    printf(c"0.0: %a\n",
+             0.0 as f64);
+    printf(c"0e0: %a\n",
+             0e0 as f64);
+    printf(c"0.0e0: %a\n",
+             0.0e0 as f64);
+    printf(c"000000000000000000000000000000000000000000000000000000000.0e0: %a\n",
+             000000000000000000000000000000000000000000000000000000000.0e0 as f64);
+    printf(c"0.000000000000000000000000000000000000000000000000000000000e0: %a\n",
+             0.000000000000000000000000000000000000000000000000000000000e0 as f64);
+    printf(c"0.0e000000000000000000000000000000000000000000000000000000000: %a\n",
+             0.0e000000000000000000000000000000000000000000000000000000000 as f64);
+
+    printf(c"\n");
+
+    printf(c"0x1.0: %a\n",
+             0x1.0 as f64);
+    printf(c"0x10.0: %a\n",
+             0x10.0 as f64);
+    printf(c"0x100.0: %a\n",
+             0x100.0 as f64);
+    printf(c"0x103.0: %a\n",
+             0x103.0 as f64);
+    printf(c"0x103.7: %a\n",
+             0x103.7 as f64);
+    printf(c"0x103.70: %a\n",
+             0x103.70 as f64);
+    printf(c"0x103.70p4: %a\n",
+             0x103.70p4 as f64);
+    printf(c"0x103.70p5: %a\n",
+             0x103.70p5 as f64);
+    printf(c"0x103.70p+5: %a\n",
+             0x103.70p+5 as f64);
+    printf(c"0x103.70p-5: %a\n",
+             0x103.70p-5 as f64);
+
+    printf(c"\n");
+
+    printf(c"0b10100.00010e0: %a\n",
+             0b10100.00010e0 as f64);
+    printf(c"0o10700.00010e0: %a\n",
+             0o10700.00010e0 as f64);
+
     return 0;
 }
-    )SOURCE", "0=0\n");
+    )SOURCE", R"OUTPUT(
+0.0: 0x0p+0
+0e0: 0x0p+0
+0.0e0: 0x0p+0
+000000000000000000000000000000000000000000000000000000000.0e0: 0x0p+0
+0.000000000000000000000000000000000000000000000000000000000e0: 0x0p+0
+0.0e000000000000000000000000000000000000000000000000000000000: 0x0p+0
+
+0x1.0: 0x1p+0
+0x10.0: 0x1p+4
+0x100.0: 0x1p+8
+0x103.0: 0x1.03p+8
+0x103.7: 0x1.037p+8
+0x103.70: 0x1.037p+8
+0x103.70p4: 0x1.037p+12
+0x103.70p5: 0x1.037p+13
+0x103.70p+5: 0x1.037p+13
+0x103.70p-5: 0x1.037p+3
+
+0b10100.00010e0: 0x1.41p+4
+0o10700.00010e0: 0x1.1c0001p+12
+)OUTPUT");
 
     add_simple_case("structs", R"SOURCE(
 use "std.zig";