Tests reproducing problems with payments + fix

.github/workflows/tests.yml

@@ -37,6 +37,7 @@ jobs:
           Golem.Tests/tests/*.log
           Golem.Tests/tests/*/modules/golem-data/yagna/*.log
           Golem.Tests/tests/*/modules/golem-data/provider/*.log
+          Golem.Tests/tests/*/modules/golem-data/provider/*.json
           Golem.Tests/tests/*/modules/golem-data/provider/exe-unit/work/logs/*.log
           Golem.Tests/tests/*/modules/golem-data/provider/exe-unit/work/*/agreement.json
           Golem.Tests/tests/*/modules/golem-data/provider/exe-unit/work/*/*/*.log

GolemLib.Tests/TypesTests.cs

@@ -5,6 +5,7 @@ namespace GolemLib.Tests;
 // The following tests ensure that C# code's behavior matches Rust's one.
 public class TypesTests
 {
+
     [Fact]
     public void GolemUsage_Reward_HappyPath()
     {
@@ -152,4 +153,107 @@ public void GolemUsage_Reward_Overflow()
         var reward = usage.Reward(price);
         Assert.Equal(0.088189239176m, reward);
     }
+
+    public static GolemUsage UsageFromAgreement(decimal[] array)
+    {
+        return new GolemUsage(new GolemPrice
+        {
+            StartPrice = 1.0m,
+            EnvPerSec = array[1],
+            GpuPerSec = array[2],
+            NumRequests = array[0]
+        });
+    }
+
+    public static GolemPrice PriceFromAgreement(decimal[] array)
+    {
+        return new GolemPrice
+        {
+            StartPrice = array[3],
+            EnvPerSec = array[1],
+            GpuPerSec = array[2],
+            NumRequests = array[0]
+        };
+    }
+
+
+    [Fact]
+    public void GolemUsage_Reward_Case1()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 27.0m, 538.8576082m, 8.7264478m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.0004m, 0.0003m, 0.0002m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.2183609776200000003m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case2()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 0.0m, 9.119924900000001m, 0.0m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.0004m, 0.0003m, 0.0002m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.0038479699600000004m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case3()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 0.0m, 9.1072277m, 0.0m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.0004m, 0.0003m, 0.0002m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.0038428910799999996m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case4()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 31.0m, 474.6873272m, 9.761029m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.0003m, 0.0005m, 0.0m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.1472867126600000005m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case5()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 0.0m, 66.5695986m, 0.0m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.00025m, 0.00025m, 0.0m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.0166423996500000025m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case6()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 1.0m, 41.4281323m, 9.8315089m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.00025m, 0.00025m, 0.0m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.01281491029999999975m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case7()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 0.0m, 9.132793m, 0.0m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.00025m, 0.00025m, 0.0m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.00228319824999999975m, reward);
+    }
+
+    [Fact]
+    public void GolemUsage_Reward_Case8()
+    {
+        var usage = UsageFromAgreement(new decimal[] { 0.0m, 88.9031127m, 0.0m });
+        var price = PriceFromAgreement(new decimal[] { 0.0m, 0.00025m, 0.00025m, 0.0m });
+
+        var reward = usage.Reward(price);
+        Assert.Equal(0.0222257781749999975m, reward);
+    }
 }

GolemLib/types.cs

@@ -14,6 +14,9 @@ public class GolemUsage : GolemPrice
 {
     public static decimal Round(decimal v) => GolemUsage.RustCompatibilityRound(v);
 
+    // Print to string with exponential notation including 16 significant digits (1 integer digit and 15 fractional digits).
+    private const string print16SignificantDigitsFormat = "E15";
+
     // I couldn't find definite answer if C#'s `double` is IEEE-754 compliant floating number:
     // https://csharpindepth.com/Articles/FloatingPoint claims that it is, stackoverflow claimed that it isn't.
     // Still, both `double` and IEEE-754 64-bit floating numbers use 52 bits for binary significant digits,
@@ -22,11 +25,14 @@ public class GolemUsage : GolemPrice
     // digits when parsing floats. In order to get the same results in Rust and C#, we need to match its behavior.
     private static decimal RustCompatibilityRound(decimal i)
     {
-        // `decimal` constructor using `double` argument truncates the value to 15 significant digits.
-        // To receive a more accurate result (needed to match Rust's behavior), we need to use the `string`-based construction method.
+        // `decimal` constructor using `double` argument truncates the value to 15 decimal significant digits.
+        // `decimal` to double cast also truncates the argument to 15 decimal significant digits.
+        // To receive a more accurate result (needed to match Rust's behavior), we need to use the `string`-based construction methods.
 
-        // Print to string with exponential notation including 16 significant digits (1 integer digit and 15 fractional digits).
-        var formattedDouble = ((double)i).ToString("E15", CultureInfo.InvariantCulture);
+        string formattedDecimal = i.ToString(print16SignificantDigitsFormat, CultureInfo.InvariantCulture);
+        // We need to go through a `double` to introduce float inaccuracies to match Rust's behavior.
+        double doubleIntroducingInaccuracy = double.Parse(formattedDecimal);
+        string formattedDouble = doubleIntroducingInaccuracy.ToString(print16SignificantDigitsFormat, CultureInfo.InvariantCulture);
         return decimal.Parse(formattedDouble, NumberStyles.Float);
     }