fix: clamp begin for lambda and if block in SourceResult tests

Author: gedaiu

source/fluentasserts/results/source/result.d

@@ -72,6 +72,7 @@ struct SourceResult {
       auto result = getScope(fileTokensCache[pathToUse], line);
 
       auto begin = getPreviousIdentifier(fileTokensCache[pathToUse], result.begin);
+      begin = max(begin, result.begin);
       begin = extendToLineStart(fileTokensCache[pathToUse], begin);
       auto end = getFunctionEnd(fileTokensCache[pathToUse], begin) + 1;
 
@@ -226,3 +227,28 @@ struct SourceResult {
     printer.primary("\n");
   }
 }
+
+version(unittest) {
+  import fluent.asserts;
+  import fluentasserts.results.source.tokens;
+}
+
+@("ensureTokensLoaded clamps begin for lambda inside map")
+unittest {
+  auto source = SourceResult.create("testdata/values.d", 108);
+  auto toks = source.tokens;
+  auto output = source.toString();
+
+  output.should.not.contain("auto a = 1");
+  output.should.contain("iota");
+}
+
+@("ensureTokensLoaded clamps begin for if block")
+unittest {
+  auto source = SourceResult.create("testdata/values.d", 114);
+  auto toks = source.tokens;
+  auto output = source.toString();
+
+  output.should.not.contain("auto a = 1");
+  output.should.contain("if");
+}

testdata/values.d

@@ -102,3 +102,15 @@ unittest {
     });
   });
 }
+
+unittest {
+  auto a = 1;
+  iota(1).map!((a) { a.should.equal(2); return a + 1; }).array;
+}
+
+unittest {
+  auto a = 1;
+  if (a == 1) {
+    a.should.equal(2);
+  }
+}