Tests passes all cases and updated test description and formated with prettier extension

Author: RomanSanaye

Sprint-3/1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -11,33 +11,40 @@
 // execute the code to ensure all tests pass.
 
 function isProperFraction(numerator, denominator) {
-  // TODO: Implement this function
-  if(denominator === 0){
+  if (denominator === 0) {
     return false;
-  }else if(Math.abs(numerator) < Math.abs(denominator)){
+  } else if (Math.abs(numerator) < Math.abs(denominator)) {
     return true;
-  }else return false;
+  } else return false;
 }
 
-// The line below allows us to load the isProperFraction function into tests in other files.
-// This will be useful in the "rewrite tests with jest" step.
-module.exports = isProperFraction;
-
 // Here's our helper again
 function assertEquals(actualOutput, targetOutput) {
-  console.assert(actualOutput === targetOutput,
+  console.assert(
+    actualOutput === targetOutput,
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
 
 // TODO: Write tests to cover all cases.
-// What combinations of numerators and denominators should you test?
-
-// Example: 1/2 is a proper fraction
-assertEquals(isProperFraction(1, 2), "true");
-assertEquals(isProperFraction(3, 2), "false");
-assertEquals(isProperFraction(1, 0), "false");
-assertEquals(isProperFraction(8, 9), "true");
-assertEquals(isProperFraction(0, 1), "false");
-assertEquals(isProperFraction(-4, 1), "false");
-assertEquals(isProperFraction(2, -4), "false");
+
+// numerator < denominator (in absolute value) → proper fraction
+assertEquals(isProperFraction(1, 2), true);
+assertEquals(isProperFraction(8, 9), true);
+assertEquals(isProperFraction(0, 5), true); // numerator = 0
+
+// numerator > denominator (in absolute value) → improper fraction
+assertEquals(isProperFraction(3, 2), false);
+assertEquals(isProperFraction(-4, 1), false);
+
+// numerator = denominator (in absolute value) → not a proper fraction
+assertEquals(isProperFraction(5, 5), false);
+assertEquals(isProperFraction(-7, -7), false);
+
+// denominator = 0 → invalid fraction
+assertEquals(isProperFraction(1, 0), false);
+assertEquals(isProperFraction(0, 0), false);
+
+// negative numbers still follow the rule: numerator < denominator (in absolute value)
+assertEquals(isProperFraction(2, -4), true);
+assertEquals(isProperFraction(-2, -5), true);