coverage information for https://testingjavascript.com

0. README.md

Code Coverage

Code coverage is accomplished with Jest thanks to babel-plugin-istanbul. It transforms your code to "instrument" it for coverage. When your tests are finished, Jest reads the coverage data to generate the coverage report.

Reviewing code that has been instrumented for coverage can help understanding how coverage works and how to interpret coverage reports.

1. utils.js

function getFormattedValue(value, language = 'en-US') {
  let formattedValue = parseFloat(value).toLocaleString(language, {
    useGrouping: true,
    maximumFractionDigits: 6,
  })

  // Add back missing .0 in e.g. 12.0
  const match = value.match(/\.\d*?(0*)$/)

  if (match) {
    formattedValue += /[1-9]/.test(match[0]) ? match[1] : match[0]
  }
  return formattedValue
}

export {getFormattedValue}

2. utils.coverage.js

var cov_2k0r47ewe = function () {
  var path = "/Users/kentcdodds/Desktop/tmp/utils.js";
  var hash = "797a9fb26f3bf326cd604591b0f8e666e1afc48e";
  var global = new Function("return this")();
  var gcv = "__coverage__";
  var coverageData = {
    path: "/Users/kentcdodds/Desktop/tmp/utils.js",
    statementMap: {
      "0": {
        start: {
          line: 2,
          column: 23
        },
        end: {
          line: 5,
          column: 4
        }
      },
      "1": {
        start: {
          line: 7,
          column: 16
        },
        end: {
          line: 7,
          column: 42
        }
      },
      "2": {
        start: {
          line: 9,
          column: 2
        },
        end: {
          line: 11,
          column: 3
        }
      },
      "3": {
        start: {
          line: 10,
          column: 4
        },
        end: {
          line: 10,
          column: 66
        }
      },
      "4": {
        start: {
          line: 12,
          column: 2
        },
        end: {
          line: 12,
          column: 23
        }
      }
    },
    fnMap: {
      "0": {
        name: "getFormattedValue",
        decl: {
          start: {
            line: 1,
            column: 9
          },
          end: {
            line: 1,
            column: 26
          }
        },
        loc: {
          start: {
            line: 1,
            column: 54
          },
          end: {
            line: 13,
            column: 1
          }
        },
        line: 1
      }
    },
    branchMap: {
      "0": {
        loc: {
          start: {
            line: 1,
            column: 34
          },
          end: {
            line: 1,
            column: 52
          }
        },
        type: "default-arg",
        locations: [{
          start: {
            line: 1,
            column: 45
          },
          end: {
            line: 1,
            column: 52
          }
        }],
        line: 1
      },
      "1": {
        loc: {
          start: {
            line: 9,
            column: 2
          },
          end: {
            line: 11,
            column: 3
          }
        },
        type: "if",
        locations: [{
          start: {
            line: 9,
            column: 2
          },
          end: {
            line: 11,
            column: 3
          }
        }, {
          start: {
            line: 9,
            column: 2
          },
          end: {
            line: 11,
            column: 3
          }
        }],
        line: 9
      },
      "2": {
        loc: {
          start: {
            line: 10,
            column: 22
          },
          end: {
            line: 10,
            column: 66
          }
        },
        type: "cond-expr",
        locations: [{
          start: {
            line: 10,
            column: 47
          },
          end: {
            line: 10,
            column: 55
          }
        }, {
          start: {
            line: 10,
            column: 58
          },
          end: {
            line: 10,
            column: 66
          }
        }],
        line: 10
      }
    },
    s: {
      "0": 0,
      "1": 0,
      "2": 0,
      "3": 0,
      "4": 0
    },
    f: {
      "0": 0
    },
    b: {
      "0": [0],
      "1": [0, 0],
      "2": [0, 0]
    },
    _coverageSchema: "43e27e138ebf9cfc5966b082cf9a028302ed4184",
    hash: "797a9fb26f3bf326cd604591b0f8e666e1afc48e"
  };
  var coverage = global[gcv] || (global[gcv] = {});

  if (coverage[path] && coverage[path].hash === hash) {
    return coverage[path];
  }

  return coverage[path] = coverageData;
}();

function getFormattedValue(value, language = (cov_2k0r47ewe.b[0][0]++, 'en-US')) {
  cov_2k0r47ewe.f[0]++;
  let formattedValue = (cov_2k0r47ewe.s[0]++, parseFloat(value).toLocaleString(language, {
    useGrouping: true,
    maximumFractionDigits: 6
  }));
  const match = (cov_2k0r47ewe.s[1]++, value.match(/\.\d*?(0*)$/));
  cov_2k0r47ewe.s[2]++;

  if (match) {
    cov_2k0r47ewe.b[1][0]++;
    cov_2k0r47ewe.s[3]++;
    formattedValue += /[1-9]/.test(match[0]) ? (cov_2k0r47ewe.b[2][0]++, match[1]) : (cov_2k0r47ewe.b[2][1]++, match[0]);
  } else {
    cov_2k0r47ewe.b[1][1]++;
  }

  cov_2k0r47ewe.s[4]++;
  return formattedValue;
}

export { getFormattedValue };

3. utils.with-ignore.js

function getFormattedValue(value, language = 'en-US') {
  let formattedValue = parseFloat(value).toLocaleString(language, {
    useGrouping: true,
    maximumFractionDigits: 6,
  })

  const match = value.match(/\.\d*?(0*)$/)

  /* istanbul ignore next */
  if (match) {
    formattedValue += /[1-9]/.test(match[0]) ? match[1] : match[0]
  }
  return formattedValue
}

export {getFormattedValue}

4. utils.with-ignore.coverage.js

var cov_2k0r47ewe = function () {
  var path = "/Users/kentcdodds/Desktop/tmp/utils.js";
  var hash = "37e923c03715b193e7589207c26a97c97cbe28f7";
  var global = new Function("return this")();
  var gcv = "__coverage__";
  var coverageData = {
    path: "/Users/kentcdodds/Desktop/tmp/utils.js",
    statementMap: {
      "0": {
        start: {
          line: 2,
          column: 23
        },
        end: {
          line: 5,
          column: 4
        }
      },
      "1": {
        start: {
          line: 7,
          column: 16
        },
        end: {
          line: 7,
          column: 42
        }
      },
      "2": {
        start: {
          line: 13,
          column: 2
        },
        end: {
          line: 13,
          column: 23
        }
      }
    },
    fnMap: {
      "0": {
        name: "getFormattedValue",
        decl: {
          start: {
            line: 1,
            column: 9
          },
          end: {
            line: 1,
            column: 26
          }
        },
        loc: {
          start: {
            line: 1,
            column: 54
          },
          end: {
            line: 14,
            column: 1
          }
        },
        line: 1
      }
    },
    branchMap: {
      "0": {
        loc: {
          start: {
            line: 1,
            column: 34
          },
          end: {
            line: 1,
            column: 52
          }
        },
        type: "default-arg",
        locations: [{
          start: {
            line: 1,
            column: 45
          },
          end: {
            line: 1,
            column: 52
          }
        }],
        line: 1
      }
    },
    s: {
      "0": 0,
      "1": 0,
      "2": 0
    },
    f: {
      "0": 0
    },
    b: {
      "0": [0]
    },
    _coverageSchema: "43e27e138ebf9cfc5966b082cf9a028302ed4184",
    hash: "37e923c03715b193e7589207c26a97c97cbe28f7"
  };
  var coverage = global[gcv] || (global[gcv] = {});

  if (coverage[path] && coverage[path].hash === hash) {
    return coverage[path];
  }

  return coverage[path] = coverageData;
}();

function getFormattedValue(value, language = (cov_2k0r47ewe.b[0][0]++, 'en-US')) {
  cov_2k0r47ewe.f[0]++;
  let formattedValue = (cov_2k0r47ewe.s[0]++, parseFloat(value).toLocaleString(language, {
    useGrouping: true,
    maximumFractionDigits: 6
  }));
  const match = (cov_2k0r47ewe.s[1]++, value.match(/\.\d*?(0*)$/));
  /* istanbul ignore next */

  if (match) {
    formattedValue += /[1-9]/.test(match[0]) ? match[1] : match[0];
  }

  cov_2k0r47ewe.s[2]++;
  return formattedValue;
}

export { getFormattedValue };