Merge pull request #311 from petertseng/triangle-json

triangle: Add JSON test data

Author: petertseng

triangle.json

@@ -0,0 +1,90 @@
+{
+    "#": [
+        "Pursuant to discussion in #202,",
+        "we have decided NOT to test triangles where all side lengths are positive but a + b = c.",
+        "e.g: (2, 4, 2, Isosceles), (1, 3, 4, Scalene).",
+        "It's true that the triangle inequality admits such triangles.",
+        "These triangles have zero area, however.",
+        "They're degenerate triangles with all three vertices collinear.",
+        "(In contrast, we will test (0, 0, 0, Illegal), as it is a point).",
+
+        "The expectation are given as strings,",
+        "but your language may use the appropriate representations.",
+        "For example, enums, variants, or tagged unions all are viable candidates.",
+
+        "Your track may choose to have the 'illegal' result be another member of the enum/variant/union/etc.,",
+        "or instead to signal an error/exception/etc. on an illegal triangle.",
+
+        "If appropriate for your track, you'll need to ensure that no pair of expected values are equal.",
+        "Otherwise, an implementation that always returns a constant value may falsely pass the tests.",
+        "See https://github.com/exercism/xgo/pull/208"
+    ],
+    "cases": [
+        {
+            "description": "equilateral triangle has all sides equal",
+            "sides": [2, 2, 2],
+            "expected": "equilateral"
+        },
+        {
+            "description": "larger equilateral triangle",
+            "sides": [10, 10, 10],
+            "expected": "equilateral"
+        },
+        {
+            "description": "isosceles triangle with last two sides equal",
+            "sides": [3, 4, 4],
+            "expected": "isosceles"
+        },
+        {
+            "description": "isosceles triangle with first two sides equal",
+            "sides": [4, 4, 3],
+            "expected": "isosceles"
+        },
+        {
+            "description": "isosceles triangle with first and last sides equal",
+            "sides": [4, 3, 4],
+            "expected": "isosceles"
+        },
+        {
+            "description": "isosceles triangle with unequal side larger than equal sides",
+            "sides": [4, 7, 4],
+            "expected": "isosceles"
+        },
+        {
+            "description": "scalene triangle has no equal sides",
+            "sides": [3, 4, 5],
+            "expected": "scalene"
+        },
+        {
+            "description": "larger scalene triangle",
+            "sides": [10, 11, 12],
+            "expected": "scalene"
+        },
+        {
+            "description": "scalene triangle with sides in descending order",
+            "sides": [5, 4, 2],
+            "expected": "scalene"
+        },
+        {
+            "#": "Your track may choose to skip this test and deal only with integers if appropriate",
+            "description": "small scalene triangle with floating point values",
+            "sides": [0.4, 0.6, 0.3],
+            "expected": "scalene"
+        },
+        {
+            "description": "a triangle violating the triangle inequality is illegal",
+            "sides": [7, 3, 2],
+            "expected": "illegal"
+        },
+        {
+            "description": "two sides equal, but still violates triangle inequality",
+            "sides": [1, 1, 3],
+            "expected": "illegal"
+        },
+        {
+            "description": "triangles with all sides zero are illegal",
+            "sides": [0, 0, 0],
+            "expected": "illegal"
+        }
+    ]
+}